Re: [Elecraft] K-3: Unswitched Rx Ant
Dick, The RX ANT IN jack is electrically isolated from the rest of the circuitry during transmit via a pair of PIN diodes. If the signal level is high, an associated COR (carrier-operated relay) is also kicked in. So what you're experiencing is not normal. However, we do advise keeping RX-only antennas as far from high-power transmit antennas as possible so that the COR will not activate during transmit. This minimizes risk of damage to the PIN diodes. If you continue to have such an issue, please contact k3support for other suggestions and possible troubleshooting information. 73, Wayne N6KR On Jan 24, 2011, at 10:18 PM, r...@aol.com wrote: Hi Guys, Please correct me if I'm wrong, but I believe the K-3 Receive Antenna is unswitched during tranmit... which allows high RF to get back into the receiver. That's sure the case when using my beverage for receive and transmitting on 160-meters. (sounds like my K-3 is going to blow up) I'm wondering why this is the case. Couldn't an inexpensive relay be added to the KXV3 to prevent his problem? I'd appreciate knowing what others are doing to prevent your K-3's from blowing up while using beverages on 160-meters! Is everyone building an external relay box just to switch the beverage off during transmit? Thanks 73, Dick- K9OM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Re： KPA-500 vs THP
Yes, good exercise. Except ICPW1, all the prices are WITHOUT antenna tuning unit. Based on that, the price per watt for SPE is say $3.9 per watt but with built-in ATU. THP will be sure out of my consideration. cheers, Johnny VR2XMC In addition SPE understands any make of TRCVR not only Icom. What I specially like is that the amp follows TX frequency getting the information from CAT system but then it dowble checks it with own RF sense and frequency counter before switchin to TX. I just wonder if KAT-500 is going to be integrated into KPA500 or will it be in a separate box? 73, Igor UA9CDC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA-500 vs THP
Hello Igor, Really have no idea about KAT500. Same as you, I would like KPA500+KAT500 in one box. This arrangement will give better transportation convenience. cheers, Johnny VR2XMC 寄件人﹕ Igor Sokolov ua9...@gmail.com 收件人﹕ Johnny Siu vr2...@yahoo.com.hk; Phil Hystad phys...@mac.com 副本(CC) Wes Stewart n...@yahoo.com; Elecraft elecraft@mailman.qth.net 傳送日期﹕ 2011/1/25 (二) 8:47:23 PM 主題： Re: [Elecraft] Re： KPA-500 vs THP Yes, good exercise. Except ICPW1, all the prices are WITHOUT antenna tuning unit. Based on that, the price per watt for SPE is say $3.9 per watt but with built-in ATU. THP will be sure out of my consideration. cheers, Johnny VR2XMC In addition SPE understands any make of TRCVR not only Icom. What I specially like is that the amp follows TX frequency getting the information from CAT system but then it dowble checks it with own RF sense and frequency counter before switchin to TX. I just wonder if KAT-500 is going to be integrated into KPA500 or will it be in a separate box? 73, Igor UA9CDC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA-500 vs THP
A lot of us want the KAT500 as a remote matching unit that can be used near the antenna versus a shack-bound unit. 73, Henry - K4TMC -Original Message- From: Johnny Siu vr2...@yahoo.com.hk To: Igor Sokolov ua9...@gmail.com; Phil Hystad phys...@mac.com Cc: Wes Stewart n...@yahoo.com; Elecraft elecraft@mailman.qth.net Sent: Tue, Jan 25, 2011 8:31 am Subject: [Elecraft] KPA-500 vs THP Hello Igor, Really have no idea about KAT500. Same as you, I would like KPA500+KAT500 in one box. This arrangement will give better transportation convenience. cheers, Johnny VR2XMC 寄件人﹕ Igor Sokolov ua9...@gmail.com 收件人﹕ Johnny Siu vr2...@yahoo.com.hk; Phil Hystad phys...@mac.com 副本(CC) Wes Stewart n...@yahoo.com; Elecraft elecraft@mailman.qth.net 傳送日期﹕ 2011/1/25 (二) 8:47:23 PM 主題： Re: [Elecraft] Re： KPA-500 vs THP Yes, good exercise. Except ICPW1, all the prices are WITHOUT antenna tuning unit. Based on that, the price per watt for SPE is say $3.9 per watt but with built-in ATU. THP will be sure out of my consideration. cheers, Johnny VR2XMC In addition SPE understands any make of TRCVR not only Icom. What I specially like is that the amp follows TX frequency getting the information from CAT system but then it dowble checks it with own RF sense and frequency counter before switchin to TX. I just wonder if KAT-500 is going to be integrated into KPA500 or will it be in a separate box? 73, Igor UA9CDC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] 500Hz 5-pole vs Inrad 500Hz 8-pole?
Any thoughts on the merits of one vs the other? The 5-pole filter is cheaper, but they need to me matched for diversity receive, does the 8-pole Inrad filter not need to be matched? Is either one/both wide enough for 500Hz Olivia modes? Thanks... 73, Ross N4RP -- FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.” __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA500 - just 500 watts?
OK... Got my flame suit on Why just 500 watts with te KPA-500? Is that a majic number? I am just asking. It seems that 500 watts would be OK if you are on a DXpedition...but if you are in the fray of a contest in the USofAthe more watts the better. Don't get me wrong...I love the idea of the KPA500 and the KAT500. But what is majic about 500 watts when many amps will run much more than that and are a lot less money? Cost vs Please don't kill mejust...wondering what the big deal is! Lee - K0WA K3/100 with the AL-82 In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some Common Sense and use it. If you can't find any Common Sense, ask for help from somebody who has some Common Sense. Is Common Sense divine? Common Sense is the image of the Creator expressing revealed truth in my mind. - John W. (Kansas) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
In many countries the maximum permitted power is 400W (26dBW), Lee, so an amplifier with 500W maximum capability is ideal. An amplifier with any greater power will have a limited market. Over this side of the pond we tend to stick to our licence conditions ;-) 73 de David G4DMP In a recent message, Lee Buller k...@swbell.net writes Why just 500 watts with te KPA-500? Is that a majic number? I am just asking. It seems that 500 watts would be OK if you are on a DXpedition...but if you are in the fray of a contest in the USofAthe more watts the better. -- + - - - - - - - - - - - - - - - - + | David M Pratt, Kippax, Leeds. | | Website: http://www.g4dmp.co.uk | + - - - - - - - - - - - - - - - - + __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
For me it's the difference between operation at 120 and 240 volts. I would have to add a circuit for a 1500 watt unit. Monty K2DLJ OK... Got my flame suit on Why just 500 watts with te KPA-500? Is that a majic number? I am just asking. It seems that 500 watts would be OK if you are on a DXpedition...but if you are in the fray of a contest in the USofAthe more watts the better. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I *think* I remember someone at Elecraft saying that it was more related to the price point. I wonder, though, if it was also maybe making use of engineering done on the 1500-watt prototype that never came out (one of 3 amp modules, perhaps? I would have mortgaged my first-born for one of those big ones, even at Alpha-like prices! 73, Pete N4ZR The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 On 1/25/2011 10:12 AM, Monty Shultes wrote: For me it's the difference between operation at 120 and 240 volts. I would have to add a circuit for a 1500 watt unit. Monty K2DLJ OK... Got my flame suit on Why just 500 watts with te KPA-500? Is that a majic number? I am just asking. It seems that 500 watts would be OK if you are on a DXpedition...but if you are in the fray of a contest in the USofAthe more watts the better. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
It's interesting that at least two prototypes existed: one each of the KPA-800 and KPA-1500. I saw them. Maybe there are more. I presume that Elecraft employees have them. I was told at the time that there were no serious technical problems, just that they were busy with the K3. Then I presume that marketing considerations led them to rethink the idea (my unprofessional guess is that they were right). But can you imagine how much one of those prototypes would fetch on EBay? Speaking of dollars per watt, I'm presently using a homebrew pair of 813's which produce 800 watts (QSK but no 6M) and I have less than $400 into it. $0.50 dollars per watt. On 1/25/2011 7:25 AM, Pete Smith wrote: I *think* I remember someone at Elecraft saying that it was more related to the price point. I wonder, though, if it was also maybe making use of engineering done on the 1500-watt prototype that never came out (one of 3 amp modules, perhaps? I would have mortgaged my first-born for one of those big ones, even at Alpha-like prices! 73, Pete N4ZR -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
For me, 500 watts is just right. I work mostly CW and so far I have never even operated CW at more then 100 watts. There are times when I pick up a station that is so week it is a real struggle to copy. But, I do and I work that guy with my 100 watts and he hears me. I think at times 500 watts means I am pushing out more power then most of the stations that I hear. Sure, someone else could be working with power but I think that CW ops have a tendency to be operating at 100 watts or less. Oh, I never do contesting -- way too much commitment of time for me. When the contests hit, I am usually found on 30 meters. And, 500 watts probably does not bother the neighbors. I know 100 watts doesn't and I know 1000 watts does (sometimes). And, 1500 watts would definitely be a bother -- I would have to move to use it. 73, phil, K7PEH On Jan 25, 2011, at 7:25 AM, Pete Smith wrote: I *think* I remember someone at Elecraft saying that it was more related to the price point. I wonder, though, if it was also maybe making use of engineering done on the 1500-watt prototype that never came out (one of 3 amp modules, perhaps? I would have mortgaged my first-born for one of those big ones, even at Alpha-like prices! 73, Pete N4ZR The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 On 1/25/2011 10:12 AM, Monty Shultes wrote: For me it's the difference between operation at 120 and 240 volts. I would have to add a circuit for a 1500 watt unit. Monty K2DLJ OK... Got my flame suit on Why just 500 watts with te KPA-500? Is that a majic number? I am just asking. It seems that 500 watts would be OK if you are on a DXpedition...but if you are in the fray of a contest in the USofAthe more watts the better. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
500 W (+) is the ideal output level for many operators and situations. Call it medium power, if you will -- but the KPA500 can get the job done, while taking up just a K3's worth of space on your desk. And you can pick it up and move it if you need to. 73, Wayne N6KR OK... Got my flame suit on __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
1 S-unit is about 6 dB. To get an S-unit improvement over 500 watts (output) would require about 2 kW of output power. In comparison, even the simplest directional antenna is capable of producing at least 6 dB gain. It seems to me that the QRO philosophy of Stomp 'em into the Dust is a poor substitute for operating skill. Moreover, it is probably even illegal in the sense that it constitutes deliberate interference with another's signals and a disdain for the rule that says that only enough power is to be used to maintain effective communication. There is a connection between this attitude and the impulse to communicate by voice methods, even to the resurgence of interest in broadcast quality AM transmission. These are all wasteful of spectrum space and energy resources. Digital modes are surely capable of more effective DX'ing with much lower power levels, and attention to antenna design and operating conditions would seem to be much more thoughtful and professional than the CB-like attitude which is now found on the phone bands. BPSKnn is suitable for chatting, and if your bag is hello-goodbye, take a look at JT65-HF and what is possible with only a few watts of TX power. John Ragle -- W1ZI -- with almost 65 years of licensed experience in amateur radio... = On 1/25/2011 9:35 AM, Lee Buller wrote: Got my flame suit on __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 500Hz 5-pole vs Inrad 500Hz 8-pole?
Hi Ross, I do not have either 500 Hz filter, but I would expect either one would work for the 500 Hz Olivia modes, although they might be a little tight and require careful centering of the signal. I recently got the 700 Hz 8-pole Inrad filter (from http://unpcbs.com) specifically for the wider digital modes. So far I'm happy with it. 73 -- Joe KB8AP On Jan 25, 2011, at 6:27 AM, Ross Primrose wrote: Any thoughts on the merits of one vs the other? The 5-pole filter is cheaper, but they need to me matched for diversity receive, does the 8-pole Inrad filter not need to be matched? Is either one/both wide enough for 500Hz Olivia modes? Thanks... 73, Ross N4RP -- FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.” __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
Speaking of dollars per watt, I'm presently using a homebrew pair of 813's which produce 800 watts (QSK but no 6M) and I have less than $400 into it. $0.50 dollars per watt. Impressive, Vic. I would love to see some photos of your amp! In addition to the price/watt factor, perhaps equally important is a figure that takes into account price in relation to IMD in -dBc per $. Paul, W9AC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA500 Question
I may have missed this in the various discussions - does the KPA500 use 120 VAC, 220/240 VAC or either? Thanks and 73, Bud N7CW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
John, Fine in theory. Now tell me the power level I need to crack any given pileup in a reasonable amount of time and I'll use it. The fact is that one doesn't know. The best way to lower the overall pileup QRM is to work the station quickly and QRT. The appropriate measure of QRM is energy not power. Energy is power times time. Pointing to WSJT isn't reasonable since the power level required is mode and mode bandwidth dependent. I've tried WSJT on HF and fell asleep during the 5+ minute exchange. It isn't a mode for everyone and every situation. Given that other modes can work the same station in 10 seconds, multiply the WSJT power by 60 to get the same amount of energy put into the atmosphere for one contact. So WSJT energy emitted /contact is more like a 120 watt xmitter in some other mode. 73 de Brian/K3KO On 1/25/2011 11:21 AM, John Ragle wrote: 1 S-unit is about 6 dB. To get an S-unit improvement over 500 watts (output) would require about 2 kW of output power. In comparison, even the simplest directional antenna is capable of producing at least 6 dB gain. It seems to me that the QRO philosophy of Stomp 'em into the Dust is a poor substitute for operating skill. Moreover, it is probably even illegal in the sense that it constitutes deliberate interference with another's signals and a disdain for the rule that says that only enough power is to be used to maintain effective communication. There is a connection between this attitude and the impulse to communicate by voice methods, even to the resurgence of interest in broadcast quality AM transmission. These are all wasteful of spectrum space and energy resources. Digital modes are surely capable of more effective DX'ing with much lower power levels, and attention to antenna design and operating conditions would seem to be much more thoughtful and professional than the CB-like attitude which is now found on the phone bands. BPSKnn is suitable for chatting, and if your bag is hello-goodbye, take a look at JT65-HF and what is possible with only a few watts of TX power. John Ragle -- W1ZI -- with almost 65 years of licensed experience in amateur radio... = On 1/25/2011 9:35 AM, Lee Buller wrote: Got my flame suit on __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
Hi John, I agree with some of what you said. There are times, especially on the lower bands, even with an antenna with gain that signals are very weak whether on CW or SSB. Sometimes 100W just doesn't make it happen. Having the capability to go to 1500W in these situations may make the difference between working a new one and not working the new one. Many times we are at the mercy of the DX that we want to work. So having the ability of using higher power that we are allowed to use may make all the difference in the world. Usually in the winter my amp is ON even though I normally don't use it for casual operating. The darn 3 minute warm up has caused me to miss a new one such as Zone 19 on Topband a few years back when I heard him and could not work him on 160M with 100W. By the time the amp cycled ON he faded away. The amp is in the basement so no added heat or noise in the shack and most of the power while idling is for the filaments in the two tubes. This is one reason I would like to have a 1500W 160-6M solid-state amp in the basement. I could leave it off till I really needed it. By the way, there is nothing magic that you need a 6db difference to make the difference between making or not making a contact. When the DX is at the noise level much less than 6db gain could make all the difference. 73, N2TK, Tony -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John Ragle Sent: Tuesday, January 25, 2011 11:21 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 - just 500 watts? 1 S-unit is about 6 dB. To get an S-unit improvement over 500 watts (output) would require about 2 kW of output power. In comparison, even the simplest directional antenna is capable of producing at least 6 dB gain. It seems to me that the QRO philosophy of Stomp 'em into the Dust is a poor substitute for operating skill. Moreover, it is probably even illegal in the sense that it constitutes deliberate interference with another's signals and a disdain for the rule that says that only enough power is to be used to maintain effective communication. There is a connection between this attitude and the impulse to communicate by voice methods, even to the resurgence of interest in broadcast quality AM transmission. These are all wasteful of spectrum space and energy resources. Digital modes are surely capable of more effective DX'ing with much lower power levels, and attention to antenna design and operating conditions would seem to be much more thoughtful and professional than the CB-like attitude which is now found on the phone bands. BPSKnn is suitable for chatting, and if your bag is hello-goodbye, take a look at JT65-HF and what is possible with only a few watts of TX power. John Ragle -- W1ZI -- with almost 65 years of licensed experience in amateur radio... = On 1/25/2011 9:35 AM, Lee Buller wrote: Got my flame suit on __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
My reaction to your question is who cares? Your response indicates your lack of regard for the others who must share spectrum space with you. = On 1/25/2011 11:59 AM, briana wrote: John, Fine in theory. Now tell me the power level I need to crack any given pileup in a reasonable amount of time and I'll use it. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K-3: Unswitched Rx Ant
Dick, My 1000' beverages are WAY too close to my 160 phased vertical array (about 100' max at the closest point) running the legal limit power but I have zero RF getting back into the K3 when transmitting and I use NO external relays to protect the K3. I have K3 S/N 234 and 752 and I believe I remember adding the strong signal overload mod since these are older models, but I've only seen that COR activated one time when I was playing around on the workbench. I've never seen it kick in during normal operation. Something has to be abnormal with your installation or the rig itself. Like Wayne says, k3supp...@elecraft.com can help you figure it out. I hope to see you this weekend in the CQWW 160 contest because I'll be plowing away to the best of my staying awake powers. ;-) GL, Bob K5WA Message: 26 Date: Tue, 25 Jan 2011 01:18:25 EST From: r...@aol.com Subject: [Elecraft] K-3: Unswitched Rx Ant To: elecraft@mailman.qth.net Message-ID: 32f20.74153427.3a6fc...@aol.com Content-Type: text/plain; charset=US-ASCII Hi Guys, Please correct me if I'm wrong, but I believe the K-3 Receive Antenna is unswitched during tranmit... which allows high RF to get back into the receiver. That's sure the case when using my beverage for receive and transmitting on 160-meters. (sounds like my K-3 is going to blow up) I'm wondering why this is the case. Couldn't an inexpensive relay be added to the KXV3 to prevent his problem? I'd appreciate knowing what others are doing to prevent your K-3's from blowing up while using beverages on 160-meters! Is everyone building an external relay box just to switch the beverage off during transmit? Thanks 73, Dick- K9OM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 Question
Either. 73, Wayne N6KR On Jan 25, 2011, at 8:51 AM, Bud Semon N7CW wrote: I may have missed this in the various discussions - does the KPA500 use 120 VAC, 220/240 VAC or either? Thanks and 73, Bud N7CW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] 120 vs 240
I think that the argument of 120 volts compared to 240 volts is no longer and issue. Modern day houses and circuits require that 120-130 volt outlets provide at least 20 amps. Now, a reasonable 500 to 600 watt amplifier (such as the AL811 and AL-811H, the SB-200, some of the old Yaesu amps) would run fine on today's 120 volt circuit. We do this all the time with portable heaters, window AC units (about 8 amps) etc. The amp is not going to be pulling 20 amps at 120-130 volts. I think there is an average there on CW and SSB. RTTY...of course power down. But, I am sure that this is really a non issue. Lee In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some Common Sense and use it. If you can't find any Common Sense, ask for help from somebody who has some Common Sense. Is Common Sense divine? Common Sense is the image of the Creator expressing revealed truth in my mind. - John W. (Kansas) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 120 vs 240
Well, I agree that 120 VAC circuits can handle the 500 watt out or 1200 watt input, I prefer to make sure that there is more than one 20 circuit available. I typically will run a separate circuit for what I consider High loads and another for everything else. Mel, K6KBE From: Lee Buller k...@swbell.net To: Elecraft Reflector elecraft@mailman.qth.net Sent: Tue, January 25, 2011 9:53:57 AM Subject: [Elecraft] 120 vs 240 I think that the argument of 120 volts compared to 240 volts is no longer and issue. Modern day houses and circuits require that 120-130 volt outlets provide at least 20 amps. Now, a reasonable 500 to 600 watt amplifier (such as the AL811 and AL-811H, the SB-200, some of the old Yaesu amps) would run fine on today's 120 volt circuit. We do this all the time with portable heaters, window AC units (about 8 amps) etc. The amp is not going to be pulling 20 amps at 120-130 volts. I think there is an average there on CW and SSB. RTTY...of course power down. But, I am sure that this is really a non issue. Lee In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some Common Sense and use it. If you can't find any Common Sense, ask for help from somebody who has some Common Sense. Is Common Sense divine? Common Sense is the image of the Creator expressing revealed truth in my mind. - John W. (Kansas) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 120 vs 240
We do this all the time with portable heaters, window AC units (about 8 amps) etc. The quality of the 120V run makes a big difference. For example, if it's a 15A branch circuit feeding multiple outlets across several rooms -- and if wiring is formed with pressure-contact receptacles, -- and the receptacle you need is on the end of the string, don't count on a stiff supply. By contrast, if a dedicated 20A branch circuit is run only to the shack, uses clamp terminals, and the feed is shared between the amp and a few low-current devices, then output power should be more predictable with minimal voltage sag at the 500W level. Anyone considering a new 120V circuit to the shack to avoid these problems (in my case it was dimming lights) may want to consider pulling a companion 4-wire 240V circuit to handle all commercial amps, new and old. Paul, W9AC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 120 vs 240
On 25 Jan 2011 at 10:00, Mel Farrer wrote: Well, I agree that 120 VAC circuits can handle the 500 watt out or 1200 watt input, I prefer to make sure that there is more than one 20 circuit available. I typically will run a separate circuit for what I consider High loads and another for everything else. For those of us outside your country we certainly want the KPA500 to work on 230V, and 50Hz as well ... 120V ain't much use to us... (and this amp is one piece of Elecraft gear I can confidently say I will never be buying. I can work all I want with 5W). 73 Dave G3YMC http://www.davesergeant.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I'm planning to photos on my website soon. IMD would be terrible because it operates in class C. I'm a CW operator! But I designed the circuit so that the keying characteristics of my K3 are preserved. On 1/25/2011 8:47 AM, Paul Christensen wrote: Speaking of dollars per watt, I'm presently using a homebrew pair of 813's which produce 800 watts (QSK but no 6M) and I have less than $400 into it. $0.50 dollars per watt. Impressive, Vic. I would love to see some photos of your amp! In addition to the price/watt factor, perhaps equally important is a figure that takes into account price in relation to IMD in -dBc per $. Paul, W9AC -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 120 vs 240
Don't forget about the power factor. The simple power supplies in most tube-type amplifiers have pretty low power factors. I've never measured it, but my AL-82 once blew the 15 A 240 V fuses, which suggests PF was less than about 0.7. As the KPA-500 uses an unregulated 60 V linear supply (just like the HV supplies in the tube-type amplifiers), it probably also has a power factor in the 0.7 range, and probably draws 11-12 A at 120 V. A dedicated 20 A circuit would improve regulation. 73, Scott K9MA Scott Ellington Madison, Wisconsin USA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
The question of how much power is enough? is always good for a lot of chatter. Yes, an extra S unit requires 6 dB more power. Under some conditions, if 100 w gets you to S7, then dumping in enough power to get you to S8 is a case of diminishing returns. But, if 100 watts gets you to S3 with ambient noise hovering between S2 and S4, then that extra S unit can make the difference between making that contest Q or getting that new country. Emotionally, it's hard to grok that going from 500 watts to 1500 watts makes scant difference in what's heard on the other end of the circuit. I know that there are rare cases where cutting back from 1 KW to 500 watts reduces the R from a 5 to a 4, but usually it makes no difference. After a zillion years of running 100 watts or less into random lengths strung out of windows, I got my first yagi in 1981, and my first amp - an Ameritron AL-80 (the very first one with quasi-QSK built in). It put out about 700 watts, comfortably, and with the TET 4-element/triband yagi, I felt indominitable. Pile ups? No problem. Contest score surges; big time. Since then, I've spent considerably more on tower, yagis, SO2R radios and amps, and I've never felt the same sense of differentiation as when I first got a yagi and an amp. Right now, I have a Alpha 87A and Ten-Tec Centurion. I never run either above 1 KW. When the KPA-500 comes out, I'm inclined to put it in place of the Centurion and see how it plays. If I see little difference, I'll probably put the Centurion on the shelf, or sell it. If the difference is really scant, I may do the same with the Alpha. I already have 240 at the rig desk, so that's not an issue. I have been hesitant to go solid-state QRO because of the horror stories I've heard about amps blowing up. But, I don't think Elecraft will put an amp on the market until they believe it's reasonably bullet proof. My dos centavos, Rob K6RB __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
On 1/25/2011 8:59 AM, N2TK, Tony wrote: Having the capability to go to 1500W in these situations may make the difference between working a new one and not working the new one. I used to be one of those 100 watts is plenty guys -- licensed for 55 years now, I bought my first amp in 2004. Now I use it almost all the time. The main reason is RF noise on the other end. I live in the mountains with fairly low population density, so most of the time I have a local noise level of less than S3 (on a calibrated K3 meter). It's common for guys living in towns or cities to have an S7-9 noise level. When I lived in Chicago my noise level was rarely below S7. On a calibrated S-meter, the difference between S3 and S7 is 24dB. S3 to S9 is 36dB. The difference between 100W and 500W is 7db; 500W to 1.5kW is another 4.7dB. So the short answer is that the 500W amp gives you a one S-unit boost to get over the other guy's RF noise, and the 1.5kW amp gives you two S-units. Dollar cost of the power amp is only part of the equation. As others have noted, you'll need to run 240V into your shack to run most 1.5kW amps effectively. That costs money. The power supplies for most 1.5kW amps are big and HEAVY -- as we get older, it gets tougher to lift them (or transport them), and it can get very expensive to ship them. The tubes used in most big power amps require a 3-minute warm-up, while most 500W solid state amps are instant-on. I've missed more than a few DX contacts in that 3-minute cycle. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
k...@baymoon.com wrote: The question of how much power is enough? is always good for a lot of chatter. Indeed. This thread is always entertaining to those (including myself) who have completed DXCC with less than 5 watts and a random wire. Not that I'm biased. It was a struggle, and there's definitely a time and place for more power. But occasionally I like to drop down to nearly nothing to remind myself that, when the bands are really open, you *can* do it with a lot less. Eric doesn't talk about his own QRP accomplishments much, but he worked over 100 countries on a NorCal 40 (one of my first designs) running just a few watts. In fact that's how we first met; I think he called me to (a) thank me for the design and (b) boast just a little to someone who would appreciate it :) Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
On 1/25/2011 8:21 AM, John Ragle wrote: 1 S-unit is about 6 dB. Agreed. 500W to 1500W [legal max in US] is 4.7712 dB, or 0.7952 S-units. I'd bet my paycheck, if I still got one, that being in the right place and time in the pileup and/or a better antenna will make way more difference snagging the DX than being 0.7952 S-units stronger. Many countries have lower limits ... 400W in G, VK, and ZL, I think, and there are a lot those folks on this list with E-radios. My 1500W amp, which I normally run at about 600W to keep peace with the TV when the beam is pointed at the house, will depart as soon as I have my KPA500. There is a connection between this attitude and the impulse to communicate by voice methods, even to the resurgence of interest in broadcast quality AM transmission. I believe this stems from the If I shout into my cell phone, the other guy [and everyone around me] will hear me better theory. 73, Fred K6DGW [only 57 years] - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
In a pileup, you want to work the target station. Everone is bunched up over the listening range of the DX station, which is sometimes one frequency plus or minus a fraction of a KHz. In that situation, you want to get the contact and regard for others in the pileup plays little role. Most hams will put up the best antenna they can. After that, the limiting factors are (1) propogation (it is what it is when you are hearing the target and want to try and work it), (2) operating skill (something to acquire and constantly improve), (3) luck (truly being in the right place at the right time) and (4) signal strength on the receiving end (in that situation, every watt counts to some extent). Sometimes, barefoot does it. Othertimes, a KW doesn't. A good analogy is entering a knife fight with your bare hands. You might win, but then again I'll take the availability of legal limit any day when I head into a pileup. Lou, W0FK John Ragle wrote: My reaction to your question is who cares? Your response indicates your lack of regard for the others who must share spectrum space with you. = On 1/25/2011 11:59 AM, briana wrote: John, Fine in theory. Now tell me the power level I need to crack any given pileup in a reasonable amount of time and I'll use it. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html - St. Louis, MO K3 #2513, P3 #620 -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA500-just-500-watts-tp5959017p5960029.html Sent from the [QRO] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
The QRPer's mantra, Skill not power 73s Jim, W4ATK On Jan 25, 2011, at 12:47 PM, Wayne Burdick wrote: k...@baymoon.com wrote: The question of how much power is enough? is always good for a lot of chatter. Indeed. This thread is always entertaining to those (including myself) who have completed DXCC with less than 5 watts and a random wire. Not that I'm biased. It was a struggle, and there's definitely a time and place for more power. But occasionally I like to drop down to nearly nothing to remind myself that, when the bands are really open, you *can* do it with a lot less. Eric doesn't talk about his own QRP accomplishments much, but he worked over 100 countries on a NorCal 40 (one of my first designs) running just a few watts. In fact that's how we first met; I think he called me to (a) thank me for the design and (b) boast just a little to someone who would appreciate it :) Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html JIM ROGERS, W4ATK w4...@bellsouth.net http://web.me.com/jimrogers_w4atk K3/100 P3 K2/10 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] just 500W ?
The shirt I wear sometimes in the hamfests says up front : Life is too short for QRP I run every night not less than 500W on 40M,only way to brake the pileups and fight againts the big guns.When every single one on the bands drop their power to 100W or less,I drop mine,that is not going to happen never anymore,its too late,so design and build another amp for 1KW and I am sure you will sell way more than the actual 500W unit. AD4C If freedom means something,it is the right to tell others what they don't want to hear –George Orwell __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
John, what follows is The W4LT Big-Time Radio Corollary of Contesting (or DX'ing): - Antenna Brains Power Pick two of the three. -- 73 Lu W4LT K3# 3192 On 1/25/2011 11:21 AM, John Ragle wrote: It seems to me that the QRO philosophy of Stomp 'em into the Dust is a poor substitute for operating skill. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 120 vs 240
On 1/25/2011 10:37 AM, Scott Ellington wrote: but my AL-82 once blew the 15 A 240 V fuses, which suggests PF was less than about 0.7. There are now two elements to power factor -- the phase angle at 60 Hz and the impulsive (non-sine wave) nature of the AC line current due to the input filter capacitor. With any form of power supply, the impulsive current dominates the power factor More to the point, the main thing that blows breakers with very large power supplies is the inrush of current at turn-on to charge the input filter cap. It's a statistically random thing -- if the turn-on occurs at or near zero crossing of the sine wave, the inrush current is small. If it occurs near the positive or negative peak of the sine wave, the inrush current is high and a breaker is more likely to pop. That does NOT cause any sort of destructive failure -- it's merely the inconvenience of having to get up to reset the breaker -- and it ONLY happens when the power supply is first turned on. We learned about these issues in the pro audio world about 30 years ago when audio power amps rated for up to 2kW started coming into wide use. Over the years, various methods were used to soften the turn-on transient, and/or to spread the turn-on times of a rack full of these amps over several seconds so that turning the system on didn't blow the main breaker for a building! The difference between a linear supply and a switching supply in this regard is that while they both have input filter caps, the cap in the linear supply is much larger (and the transformer is usually more robust), so the inrush current will usually be greater. There's a tutorial view of all of this in the audio section of my website. http://audiosystemsgroup.com/publish.htm 73, Jim Brown K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] A Comment on my 500 Watt Comment
When I post my question about 500 watts, I am curious to the fact of why 500 watts? Price point? Form vs Function? I based the question after seeing the 1500 watt prototype at Dayton several years ago. If I remember right, the price was off my chart. So, what as interested me is there some sort of price point...form factor...or electrical engineering factor that brought the KPA500 to 500 watts? Lee k0WA K3 and a AL-82 In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some Common Sense and use it. If you can't find any Common Sense, ask for help from somebody who has some Common Sense. Is Common Sense divine? Common Sense is the image of the Creator expressing revealed truth in my mind. - John W. (Kansas) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
A listen on the bands during most contests, makes it pretty clear which of the 3 is most normally left out :-) 4cx15000 anyone? Grant/NQ5T On Jan 25, 2011, at 12:59 PM, Lu Romero wrote: John, what follows is The W4LT Big-Time Radio Corollary of Contesting (or DX'ing): - Antenna Brains Power Pick two of the three. -- __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 120 vs 240
On Jan 25, 2011, at 1:02 PM, Jim Brown wrote: On 1/25/2011 10:37 AM, Scott Ellington wrote: but my AL-82 once blew the 15 A 240 V fuses, which suggests PF was less than about 0.7. More to the point, the main thing that blows breakers with very large power supplies is the inrush of current at turn-on to charge the input filter cap. Not in this case. Anyway, the AL-82 has inrush current limiting. The difference between a linear supply and a switching supply in this regard is that while they both have input filter caps, the cap in the linear supply is much larger (and the transformer is usually more robust), so the inrush current will usually be greater. Not necessarily. Many switching supplies simply rectify and filter the line voltage to produce 170 or 340 V DC, without even a transformer to limit the current. (All now have at least a thermistor, but they didn't always.) More expensive switching supplies have power factor correction circuitry, which inherently limits inrush current. I don't know that any of the switching supplies commonly used to power transceivers have this feature. (Virtually all computer supplies do, as required by law. How this came about is an interesting story.) 73, Scott K9MA Scott Ellington Madison, Wisconsin USA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] A Comment on my 500 Watt Comment
I may have missed this at some points, but what is the expected price for the KPA 500? Bob, W1EQ From: Lee Buller k...@swbell.net To: Elecraft Reflector elecraft@mailman.qth.net Sent: Tue, January 25, 2011 2:06:23 PM Subject: [Elecraft] A Comment on my 500 Watt Comment When I post my question about 500 watts, I am curious to the fact of why 500 watts? Price point? Form vs Function? I based the question after seeing the 1500 watt prototype at Dayton several years ago. If I remember right, the price was off my chart. So, what as interested me is there some sort of price point...form factor...or electrical engineering factor that brought the KPA500 to 500 watts? Lee k0WA K3 and a AL-82 In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some Common Sense and use it. If you can't find any Common Sense, ask for help from somebody who has some Common Sense. Is Common Sense divine? Common Sense is the image of the Creator expressing revealed truth in my mind. - John W. (Kansas) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I don't know about majic, but 500 watts out closely mimics the maximum legal power of the era that many of us got into ham radio. The power was specified in input power and was limited to 1 KW. I suspect that the KPA-500 is close to that. 500 watts seems to be a good figure for a 120 volt supply voltage. And while it might be an expensive way to go, the KPA-500 could be driven to 200 watts with about 7 watts, giving what some have wished for with a K3. 200 watts of very clean SSB output. I only do CW so this is just a thought. And I think there is a full power amplifier in the works. 73, Rick Dettinger K7MW OK... Got my flame suit on Why just 500 watts with te KPA-500? Is that a majic number? I am just asking. It seems that 500 watts would be OK if you are on a DXpedition...but if you are in the fray of a contest in the USofAthe more watts the better. Don't get me wrong...I love the idea of the KPA500 and the KAT500. But what is majic about 500 watts when many amps will run much more than that and are a lot less money? Cost vs Please don't kill mejust...wondering what the big deal is! Lee - K0WA K3/100 with the AL-82 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] just 500 watts?
I think the real point is whether the KPA500 will be an effective tool for the desired type of contact in the hands of a thoughtful (skillful) operator. I have enough faith in the design capability of the Elecraft group that I believe the KPA500 will be a clean amp. No GIGO either, if driven with a K3, etc. The power level should be more than sufficient for the best DX or pile-up, if the brain is engaged before the mike button is pressed. Most of what I hear from QRO advocates reminds me of road rage or extended magazines in other contexts, e.g. poorly suppressed aggression. In a long lifetime of enjoying amateur radio, I have had the misfortune of living near hams who ran a Texas KW with excessive speech compression, or ran an early VHF/UHF amp of the linearized variety and who managed to take out an entire band. I recall a summer VHF Sweeps in which a group on Mt. Monadnock, ~50 miles airline from me, made the entirety of 2 meters unserviceable. Of course, voice operators are not alone to blame...one only has to examine some of our south-of-the-equator brethren running BPSK to see truly excessive bandwidth consumption. One or two of these BPSK'ers routinely take out the entire 4-kHz (self-imposed) PSK segment on 20 meters at my location. John Ragle -- W1ZI __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K-3: Unswitched Rx Ant
K5WA wrote: My 1000' beverages are WAY too close to my 160 phased vertical array (about 100' max at the closest point) running the legal limit power but I have zero RF getting back into the K3 when transmitting and I use NO external relays to protect the K3. Same here. I've never had problems using 4 different rigs (TS-930S, FT-1000MP, Orion and K3) running legal limit power to verticals with Beverages nearby (once even over elevated radials at my Colorado QTH). If you pay careful attention to common mode reduction (i.e. isolating ground returns) I don't think you need front end savers, etc. CU in the CQ 160 this weekend...band sounds like it may be improving. 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/K-3-Unswitched-Rx-Ant-tp5957719p5960249.html Sent from the [K3] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA-500 vs THP
Henry, Absolutely!...exactly what I want...:-) Remote;y installed at the base of my antennas will be excellent. Gary On Wed, Jan 26, 2011 at 12:19 AM, k4...@aol.com wrote: A lot of us want the KAT500 as a remote matching unit that can be used near the antenna versus a shack-bound unit. 73, Henry - K4TMC -Original Message- From: Johnny Siu vr2...@yahoo.com.hk To: Igor Sokolov ua9...@gmail.com; Phil Hystad phys...@mac.com Cc: Wes Stewart n...@yahoo.com; Elecraft elecraft@mailman.qth.net Sent: Tue, Jan 25, 2011 8:31 am Subject: [Elecraft] KPA-500 vs THP Hello Igor, Really have no idea about KAT500. Same as you, I would like KPA500+KAT500 in one box. This arrangement will give better transportation convenience. cheers, Johnny VR2XMC 寄件人﹕ Igor Sokolov ua9...@gmail.com 收件人﹕ Johnny Siu vr2...@yahoo.com.hk; Phil Hystad phys...@mac.com 副本(CC) Wes Stewart n...@yahoo.com; Elecraft elecraft@mailman.qth.net 傳送日期﹕ 2011/1/25 (二) 8:47:23 PM 主題： Re: [Elecraft] Re： KPA-500 vs THP Yes, good exercise. Except ICPW1, all the prices are WITHOUT antenna tuning unit. Based on that, the price per watt for SPE is say $3.9 per watt but with built-in ATU. THP will be sure out of my consideration. cheers, Johnny VR2XMC In addition SPE understands any make of TRCVR not only Icom. What I specially like is that the amp follows TX frequency getting the information from CAT system but then it dowble checks it with own RF sense and frequency counter before switchin to TX. I just wonder if KAT-500 is going to be integrated into KPA500 or will it be in a separate box? 73, Igor UA9CDC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -- Gary VK4FD - Motorhome Mobile http://www.qsl.net/vk4fd/ K3 #679 For everything else there's Mastercard!!! __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
Not that I want to start an argument here, but I think a strong case can be made that the US power limit of 1.5 kW is too high. (Ask any urban ham who has had to deal with 1.5 kW RFI issues.) With some exceptions, we're forced to run 1.5 kW because the competition does, not because of propagation or noise levels. Some exceptions are DX on 80 and 160, backscatter, and much VHF/UHF operation. Judging from the number of uncopyable DX stations who answer my CQ's on 80 and 160, 100 W is clearly too low. 500 W might be reasonable. The UK power limit is 400 W, and we work lots of them on 160. Any who want to argue, let's do that off line. 73, Scott K9MA Scott Ellington Madison, Wisconsin USA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] A Comment on my 500 Watt Comment
1900USD Tom, N5GE On Tue, 25 Jan 2011 11:17:48 -0800 (PST), you wrote: |I may have missed this at some points, but what is the expected price for the |KPA 500? | |Bob, W1EQ | [snip] __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
The shirt I wear sometimes in the hamfests says up front : Life is too short for QRP In stark contrast, the first rig I built, when I was 13, was a 200- milliwatt-output crystal oscillator that used half a dozen parts with their leads twisted together. No PCB, no solder, no box. It was ugly. But it worked. I connected a hand key and a battery in series, paid out a roll of guy wire and tossed it on the roof, then started listening around the rig's 40-m frequency with my Hallicrafters SX101. A guy up in Los Angeles was calling CQ, and when he came back to me, I nearly fell off my chair. 200 miles on 200 mW, with an unmatched wire laying on the roof and a 9-V battery! A few months later someone gave me an HT37 transmitter (100 W). First thing I did was turn the drive down to nearly zero, measured my output at 200 mW, and worked New York (2500 miles) on 20 m. Life's not too short for *that* :) OTOH, I'm quite proud of our engineering staff's achievement with the KPA500. Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] APF effectiveness...
APF ringing and over powering... I have had input from two Elecraft support fellows one of which was helpful. That being move the receiver off frequency (RIT) about 10Hz then adjust the APF center frequency to match. Some help - yes. But... The Elecraft implementation of APF in MCU 4.22 just before the current MCU 4.25 needs more work. The APF in the IC-781 from 1988/9 is much more effective with plenty of gain without ringing. The FT-1000 (early production only) and IC-7800 APFs are better than the K3's. The Yaesu MP series I have to admit, is useless. Elecraft either needs to tweak it for perhaps less gain and a little wider BW or give the user the tools to do it ourselves. I hope the folks at Elecraft will put some attention to this feature. it can be a powerful tool. I still find it amazing that this little 9.5 pound K3 sitting next to my 52 pound IC-7800 and 51 pound IC-781 is as good and in some cases better than either of those radios. Also nice is power consumption - listening on the K3 consumes only 33 watts with an Astron SS-30 while the two Icom's consume 100 watts each. 73, Bob - W6OPO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] APF effectiveness...
Hi Bob, While agree that the APF could use a bit more gain ( I always end up turning up AF Gain once the APF is enabled), I find it leagues ahead of the APF in my ex-7700- which I believe had the same APF as the 7800. I even complained to Icom about its ineffectiveness. At the time I was running the 7700, I also had my Alpha Delta speaker system with its own APF- and there was no contest between the two. I thought perhaps there was a problem with my 7700's APF until I heard from others that also thought it was a useless feature on the 7700. Dale W4OP - Original Message - From: Bob Lanning bob.w6...@gmail.com To: elecraft@mailman.qth.net Sent: Tuesday, January 25, 2011 3:11 PM Subject: [Elecraft] APF effectiveness... APF ringing and over powering... I have had input from two Elecraft support fellows one of which was helpful. That being move the receiver off frequency (RIT) about 10Hz then adjust the APF center frequency to match. Some help - yes. But... The Elecraft implementation of APF in MCU 4.22 just before the current MCU 4.25 needs more work. The APF in the IC-781 from 1988/9 is much more effective with plenty of gain without ringing. The FT-1000 (early production only) and IC-7800 APFs are better than the K3's. The Yaesu MP series I have to admit, is useless. Elecraft either needs to tweak it for perhaps less gain and a little wider BW or give the user the tools to do it ourselves. I hope the folks at Elecraft will put some attention to this feature. it can be a powerful tool. I still find it amazing that this little 9.5 pound K3 sitting next to my 52 pound IC-7800 and 51 pound IC-781 is as good and in some cases better than either of those radios. Also nice is power consumption - listening on the K3 consumes only 33 watts with an Astron SS-30 while the two Icom's consume 100 watts each. 73, Bob - W6OPO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.872 / Virus Database: 271.1.1/3402 - Release Date: 01/25/11 02:34:00 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
I know the feeling! I was fooling around sending into a cantenna with my HW 100. This was in the early 1970's, and I thought that a resistor inside a grounded metal can would not let any signal out! It was a major surprise, to say the least, when someone came back to me. Only about a mile away, but this was my first QRP contact. The next was still 25 years in the future. Rick Dettinger K7MW I connected a hand key and a battery in series, paid out a roll of guy wire and tossed it on the roof, then started listening around the rig's 40-m frequency with my Hallicrafters SX101. A guy up in Los Angeles was calling CQ, and when he came back to me, I nearly fell off my chair. 200 miles on 200 mW, with an unmatched wire laying on the roof and a 9-V battery! Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
The 1st non Heathkit rig I ever built (1st was a 90W CW transmitter I built from scratch when first licensed back in 1963) was a little 2 transistor MOPA rig (2N706 VFO driving a 2N2219 PA) which put out about 750 mw. Receiver was a Collins R-390A on loan from the Army MARS program and I was living on Fort Devens, Massachusetts, an Army base 35 miles West of Boston. I was net control for the Eastern Mass CW traffic net on 80 meters 3 nights a week and even though I had a Heath HW-16, I often used the little transistor TX to run the net. First 3 nights I had it on, never told anyone and only one person commented that my signal was just S8 so I might want to check my antenna connections. When I told them what I was using for a transmitter, no one would believe me until I had several of them over to see it. It covered from 3.5 to 3.8 MHz. I put it on 3.510 and called CQ. On the 3rd call, an OK3 came back and gave me a 579 signal report. The net guys never gave me any mor e grief about the puny little solid state rig. Ain't it fun Wayne? Another good story happened at a tailgate swapfest here in Wichita. I had my K2 and KX1 set up with a PAC-12 vertical hooked to about 80 feet of RG-174 (yes, 174) and was showing how the KX1 could work cross mode CW to SSB on 20 meters when I heard Vello, ES1QD working a bunch of stateside guys and the pileup was getting pretty deep. I quickly switched the antenna to the K2, dialled in the frequency and turned up the speaker. Pretty soon a bunch gathered around and when I picked up the microphone, one of the big QRO guys started ragging on me and telling everyone around us about how I really thought I could bust a pileup on SSB with that puny K2 @ 5 watts! You should have seen his jaw drop when I keyed the microphone and said W0EB/QRP. Vello came back and said Everybody stand by, QRP station go again. I called him again and we had a nice chat for a couple of minutes and he gave me a 57 signal report. I'd attach the QSL card here, but this reflector doesn't allow HTML or attachments. That ended the life's too short for QRP ribbing I used to get. It also got a couple of the guys turned on to the K2. Jim - W0EB The shirt I wear sometimes in the hamfests says up front : Life is too short for QRP In stark contrast, the first rig I built, when I was 13, was a 200- milliwatt-output crystal oscillator that used half a dozen parts with their leads twisted together. No PCB, no solder, no box. It was ugly. But it worked. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
Yes and yes. N7WS --- On Tue, 1/25/11, Hector Padron ad4c2...@yahoo.com wrote: The shirt I wear sometimes in the hamfests says up front : Life is too short for QRP I run every night not less than 500W on 40M,only way to brake the pileups and fight againts the big guns.When every single one on the bands drop their power to 100W or less,I drop mine,that is not going to happen never anymore,its too late,so design and build another amp for 1KW and I am sure you will sell way more than the actual 500W unit. AD4C __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Dollars per watt (was: KPA500 - just 500 watts?)
On Tue, 2011-01-25 at 08:04 -0800, Vic K2VCO wrote: ... Speaking of dollars per watt, I'm presently using a homebrew pair of 813's which produce 800 watts (QSK but no 6M) and I have less than $400 into it. $0.50 dollars per watt. Many years ago I heard of a guy who built a linear amplifier using a single 811. He ran it in grounded grid with tons of negative RF feedback (grid lifted way off RF ground with a small capacitor) so that the gain was only a little greater than unity. As I recall, the input RF driving power was 900 watts and the output power was 1000W, the other 100W being supplied by the 811. But since amplifiers are rated by output power rather than [output - input] power, his dollars per watt came out at something like 5 cents/watt. :=) Al N1AL __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] (K3) RTTY offset ?
Hello elecrafters Trying to config k3 on digi modes but i noted a offset between rx and tx ... When i find a sig on the scope i click on it and the rx is ok. Then i go tx and the station comes back in another qrg. Or when i call cq the stations comes back in another qrg Any clue pse ?? 73´s de PY2ADR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
Wayne, Interesting. It was the Norcal 40A that also got me interested in QRP. When I got back into ham radio in 2004, all I could think of was SSB and legal limit power. This is because my previous stint as a ham operator in 1966 was as Novice only: meaning CW only and 75 watts input power. But, I soon tired of amplified power and now almost never use it. But, I want it there when necessary which is why I will buy the KPA500. But, I do have my KX1 and I am working more and more QSO of significant distance. So far my longest is only 1000 miles but this is mostly because of my lack of time lately to operate during the day when the bands are best on 20 and 40. Although, 40 is not bad at night either at times. But, I have reversed my position from almost always having my amp on to now almost never having it on. 73, phil, K7PEH On Jan 25, 2011, at 10:47 AM, Wayne Burdick wrote: k...@baymoon.com wrote: The question of how much power is enough? is always good for a lot of chatter. Indeed. This thread is always entertaining to those (including myself) who have completed DXCC with less than 5 watts and a random wire. Not that I'm biased. It was a struggle, and there's definitely a time and place for more power. But occasionally I like to drop down to nearly nothing to remind myself that, when the bands are really open, you *can* do it with a lot less. Eric doesn't talk about his own QRP accomplishments much, but he worked over 100 countries on a NorCal 40 (one of my first designs) running just a few watts. In fact that's how we first met; I think he called me to (a) thank me for the design and (b) boast just a little to someone who would appreciate it :) Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Dollars per watt
This sounds like a story by Hashafisti Scratchi or Larsen E. Rapp. On 1/25/2011 12:52 PM, Alan Bloom wrote: On Tue, 2011-01-25 at 08:04 -0800, Vic K2VCO wrote: ... Speaking of dollars per watt, I'm presently using a homebrew pair of 813's which produce 800 watts (QSK but no 6M) and I have less than $400 into it. $0.50 dollars per watt. Many years ago I heard of a guy who built a linear amplifier using a single 811. He ran it in grounded grid with tons of negative RF feedback (grid lifted way off RF ground with a small capacitor) so that the gain was only a little greater than unity. As I recall, the input RF driving power was 900 watts and the output power was 1000W, the other 100W being supplied by the 811. But since amplifiers are rated by output power rather than [output - input] power, his dollars per watt came out at something like 5 cents/watt. :=) Al N1AL -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
Yeah,yeah,yeah, I know all about qrp,I started in hamradio when I was 13 years old,I am 62 now,you figure how long ago,my first QRP was a 6V6 tube oscilating with a xtal on 7005 and that thing made barely 2W and with a dipole I worked in less than a year more than 100 countries in CW from my CO land BUT those were years where the bands were not so crowded and they were not so noisy and the solar cycles were great BUT today with the hundred thousand stations filling the bands,the high band noise,the terrible propagation,QRP working is not the same,besides the courtesy of those old times its gone forever,bands are plagued by guys using full legal power OR MORE who has no respect for anybody and the actual rules is have power or not make a contact,most of the times unless you have a great beam antenna on 40M you won't do much with a QRP,you need to have those 500W from your amp or more.Its tough today to survive in the bands jungle sorrounded by lions who want to smash your poor signal and you only have a razor blade to defend yourself. Life is too short for QRP ! AD4C If freedom means something,it is the right to tell others what they don't want to hear –George Orwell --- On Tue, 1/25/11, Wayne Burdick n...@elecraft.com wrote: From: Wayne Burdick n...@elecraft.com Subject: Re: just 500W ? To: Hector Padron ad4c2...@yahoo.com Cc: elecraft@mailman.qth.net Date: Tuesday, January 25, 2011, 8:10 PM The shirt I wear sometimes in the hamfests says up front : Life is too short for QRP In stark contrast, the first rig I built, when I was 13, was a 200-milliwatt-output crystal oscillator that used half a dozen parts with their leads twisted together. No PCB, no solder, no box. It was ugly. But it worked. I connected a hand key and a battery in series, paid out a roll of guy wire and tossed it on the roof, then started listening around the rig's 40-m frequency with my Hallicrafters SX101. A guy up in Los Angeles was calling CQ, and when he came back to me, I nearly fell off my chair. 200 miles on 200 mW, with an unmatched wire laying on the roof and a 9-V battery! A few months later someone gave me an HT37 transmitter (100 W). First thing I did was turn the drive down to nearly zero, measured my output at 200 mW, and worked New York (2500 miles) on 20 m. Life's not too short for *that* :) OTOH, I'm quite proud of our engineering staff's achievement with the KPA500. Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
And I think a lot of the skill should be credited to the ops on the other end who manage to pull out the QRP stations. That said, operator skill is particularly important for any QRP station - I will never understand why many still use straight keys, badly formed cw, and unnecessary verbiage (like /QRP, for example). 73, Pete N4ZR The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 On 1/25/2011 1:55 PM, JAMES ROGERS wrote: The QRPer's mantra, Skill not power 73s Jim, W4ATK On Jan 25, 2011, at 12:47 PM, Wayne Burdick wrote: k...@baymoon.com wrote: The question of how much power is enough? is always good for a lot of chatter. Indeed. This thread is always entertaining to those (including myself) who have completed DXCC with less than 5 watts and a random wire. Not that I'm biased. It was a struggle, and there's definitely a time and place for more power. But occasionally I like to drop down to nearly nothing to remind myself that, when the bands are really open, you *can* do it with a lot less. Eric doesn't talk about his own QRP accomplishments much, but he worked over 100 countries on a NorCal 40 (one of my first designs) running just a few watts. In fact that's how we first met; I think he called me to (a) thank me for the design and (b) boast just a little to someone who would appreciate it :) Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html JIM ROGERS, W4ATK w4...@bellsouth.net http://web.me.com/jimrogers_w4atk K3/100 P3 K2/10 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] APF effectiveness...
I've found that using the APF with the 400 filter (or wider) dialed-in provides less ringing than using APF with the 50 filter (DSP) dialed-in. Either way, it's effectiveness is excellent, and that from a twelve-year FT-1000D owner. 73, Kent K9ZTV Jefferson City, MO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Loudspeaker audio dies away after few minutes!
Hello Elecraft K3'ers, I only joined this Reflector yesterday, and already can see there's a huge amount of K3-related knowledge on here! My K3 (2498) does a superb job but now has a problem concerning the loudspeaker audio that's getting ever more irritating. For the first few minutes after the K3 is turned on there is audio from the loud-speaker OK, but it's scratchy and distorted compared to what's being heard in the headphones (where the audio is perfect). After a few more minutes the audio in the loudspeaker gets ever more scratchy with the sound of frying eggs coming and going. After another ten minutes or so the audio from the loudspeaker stops completely (but continues fine in the headphones). Operationally this is not a problem because I always wear headphones for CW operating, but not being able to use the loudspeaker is annoying. Even after the loudspeaker has gone completely dead, it still appears to function for about half-a-second or so after the headphones are either plugged in or out of the front panel socket. Is there something perhaps wrong with my settings on the K3 that might be causing this? Or is there possibly something more sinister going on within my K3? 73 - Nigel G3TXF __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
the courtesy of those old times its gone forever That's like saying CW is dead. Etiquette may have changed, but like Elecraft has proven: If you innovate and do what you believe in, you can beat the fray instead of joining it. QRO, QRP, each has its place. 73, --Andrew, NV1B .. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
Interesting that little has been said about the ANTENNA. Power is only part of the equation, and I suspect that there is more dB gain from upgrading your antenna than upgrading your amplifier from 100 to 500 or 500 to 1500 watts. I've never operated with more than 600 watts power output, but I sure noticed the improvement when I switched from a HF6V to a TH-11. That station improvement took me from 305 confirmed to No. 1 Honor Roll. Yes, 1500 watts may get you there faster, but 500 watts is all you really need to do the job. Nelson, KU0A -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Hector Padron Sent: Tuesday, January 25, 2011 3:37 PM To: Wayne Burdick Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] just 500W ? Yeah,yeah,yeah, I know all about qrp,I started in hamradio when I was 13 years old,I am 62 now,you figure how long ago,my first QRP was a 6V6 tube oscilating with a xtal on 7005 and that thing made barely 2W and with a dipole I worked in less than a year more than 100 countries in CW from my CO land BUT those were years where the bands were not so crowded and they were not so noisy and the solar cycles were great BUT today with the hundred thousand stations filling the bands,the high band noise,the terrible propagation,QRP working is not the same,besides the courtesy of those old times its gone forever,bands are plagued by guys using full legal power OR MORE who has no respect for anybody and the actual rules is have power or not make a contact,most of the times unless you have a great beam antenna on 40M you won't do much with a QRP,you need to have those 500W from your amp or more.Its tough today to survive in the bands jungle sorrounded by lions who want to smash your poor signal and you only have a razor blade to defend yourself. Life is too short for QRP ! AD4C If freedom means something,it is the right to tell others what they don't want to hear George Orwell --- On Tue, 1/25/11, Wayne Burdick n...@elecraft.com wrote: From: Wayne Burdick n...@elecraft.com Subject: Re: just 500W ? To: Hector Padron ad4c2...@yahoo.com Cc: elecraft@mailman.qth.net Date: Tuesday, January 25, 2011, 8:10 PM The shirt I wear sometimes in the hamfests says up front : Life is too short for QRP In stark contrast, the first rig I built, when I was 13, was a 200-milliwatt-output crystal oscillator that used half a dozen parts with their leads twisted together. No PCB, no solder, no box. It was ugly. But it worked. I connected a hand key and a battery in series, paid out a roll of guy wire and tossed it on the roof, then started listening around the rig's 40-m frequency with my Hallicrafters SX101. A guy up in Los Angeles was calling CQ, and when he came back to me, I nearly fell off my chair. 200 miles on 200 mW, with an unmatched wire laying on the roof and a 9-V battery! A few months later someone gave me an HT37 transmitter (100 W). First thing I did was turn the drive down to nearly zero, measured my output at 200 mW, and worked New York (2500 miles) on 20 m. Life's not too short for *that* :) OTOH, I'm quite proud of our engineering staff's achievement with the KPA500. Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1202 / Virus Database: 1435/3400 - Release Date: 01/24/11 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I agree with the first two. I appreciate a clean output from my transmitter and I would much rather use a bug. More fun! But /QRP is not redundant, if that is what I want to communicate, then I use it. I don't see it as a bad operating practice. I find that it encourages other QRP ops to give me a try. Those are often the most enjoyable contacts. 2 way QRP. 73, Rick K7milliwatt I will never understand why many still use straight keys, badly formed cw, and unnecessary verbiage (like /QRP, for example). 73, Pete N4ZR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] just 500 W
I greatly enjoy QRP, but in this post I will add another angle to the arguments in favor of QRO. It seems that most of the people on the reflector are spending their time seriously contesting or working pileups. Under those conditions your transmission will invariably harm someone else if ever so slightly. If desired, one can reduce the impact by relying more on skill or by contesting in a lower power class. Personally I seldom bother with contests anymore, except for FD, and if I work a DX I don't care what my DXCC standing is. When I operate, it is not the best time of day but when I feel like it. With this attitude I see a lot of almost dead bands. At some point sunspots will be numerous enough to change this, but for the last several years a lot of operators just don't seem to bother using a given band unless that band is really working well, or there is a contest on. I do a lot of tuning around a dead band looking for a signal. In this situation a wide RX bandwidth is helpful. If there is a station calling CQ, it really helps if he is QRO. Even key clicks are helpful in that situation. (Hmmm, should I beg the Elecraft developers to add a K3 function to generate clicks for those special times only???) Sometimes I use QRO myself to call CQ. Then, when I get a QSO, I may or may not reduce power. I think the FCC rule is to use no more power than needed for the desired communication. QSB sometimes leads to a need for extra power, but also if I use high power for the current QSO, then I know that there is a much better chance of someone else calling me after the current QSO ends. Thus I am *now* using the power required for the desired communication which happens *later*. This may seem like stretching the rules, but from a rational perspective, is it any worse than having to call CQ again at high power? In summary, sometimes there is too much RF on the bands, and one has to think about whether one can justify adding to it at QRO level. At other times one can do fellow hams a favor by making a quiet band become more lively and inviting. Every transmission then has a secondary mission as a beacon. 73, Erik K7TV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] A Comment on my 500 Watt Comment
Correction to Tom's posting: I posted earlier this week that we would be targeting approximately $1,995. 73, Eric -- On 1/25/2011 12:09 PM, Tom Childers wrote: 1900USD Tom, N5GE --- On Tue, 25 Jan 2011 11:17:48 -0800 (PST), you wrote: |I may have missed this at some points, but what is the expected price for the |KPA 500? |Bob, W1EQ | __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
500W is more than many of us in other parts of the world are allowed to use. Life is not too short for QRP and it certainly isn't too short for 100W, never mind 500. If that wasn't the case we'd have all given up long ago. Power is like an arms race, people get sucked in to believing they need more than the other guy. The end result is a lot of money spent for no real gain save to satisfy one's ego. Good news for amp manufacturers and that's about all. QRP: It's not how much you've got, it's what you do with it. Anyone is welcome to put that on a T shirt. AD4C2009 wrote: The shirt I wear sometimes in the hamfests says up front : Life is too short for QRP I run every night not less than 500W on 40M,only way to brake the pileups and fight againts the big guns.When every single one on the bands drop their power to 100W or less,I drop mine,that is not going to happen never anymore,its too late,so design and build another amp for 1KW and I am sure you will sell way more than the actual 500W unit. - Julian, G4ILO. K2 #392 K3 #222. * G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html -- View this message in context: http://elecraft.365791.n2.nabble.com/just-500W-tp5960032p5960860.html Sent from the [QRO] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
It's a myth that QRP stations are always weak. Sometimes, of course, they are. But 5W is only two S-points less than the 100W most people use. Antennas can make more difference than that, and no-one talks about those when having these silly life is too short for QRP arguments. Pete Smith N4ZR wrote: And I think a lot of the skill should be credited to the ops on the other end who manage to pull out the QRP stations. That said, operator skill is particularly important for any QRP station - I will never understand why many still use straight keys, badly formed cw, and unnecessary verbiage (like /QRP, for example). - Julian, G4ILO. K2 #392 K3 #222. * G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA500-just-500-watts-tp5959017p5960882.html Sent from the [QRO] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] A Comment on my 500 Watt Comment
I am sorry but I can't help myself on this one. Are you sure you don't mean $1994.99? :-) AB2TC - Knut Eric Swartz - WA6HHQ, Elecraft wrote: Correction to Tom's posting: I posted earlier this week that we would be targeting approximately $1,995. 73, Eric -- snip -- View this message in context: http://elecraft.365791.n2.nabble.com/A-Comment-on-my-500-Watt-Comment-tp5960071p5960913.html Sent from the [QRO] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
Pete Smith N4ZR wrote: And I think a lot of the skill should be credited to the ops on the other end who manage to pull out the QRP stations. I agree. Most of the credit should go the the station that copies QRP stations. It's one thing to generate a weak signal but entirely another to be able to *receive* weak signals. IMHO the latter is MUCH more difficult ...and more satisfying to me personally. I enjoy operating QRP from portable sites using makeshift antennas but I give 99% of the credit to the guy on the other end. 73, Bill P.S. I run 1.5 kW on Topband but always get a thrill working QRP callers. http://www.eham.net/articles/10078 -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA500-just-500-watts-tp5959017p5960939.html Sent from the [QRO] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I like to think of DXing as the ham counterpart of fishing, and QRP as the counterpart of fly fishing. Dick, WO1I K3 911 At 05:50 PM 1/25/2011, Julian, G4ILO wrote: It's a myth that QRP stations are always weak. Sometimes, of course, they are. But 5W is only two S-points less than the 100W most people use. Antennas can make more difference than that, and no-one talks about those when having these silly life is too short for QRP arguments. Pete Smith N4ZR wrote: And I think a lot of the skill should be credited to the ops on the other end who manage to pull out the QRP stations. That said, operator skill is particularly important for any QRP station - I will never understand why many still use straight keys, badly formed cw, and unnecessary verbiage (like /QRP, for example). - Julian, G4ILO. K2 #392 K3 #222. * G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA500-just-500-watts-tp5959017p5960882.html Sent from the [QRO] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I just read the mail since I am not able to entertain getting a KPA500, etal. But my experience running my K3/10 on 80m SSB is everyone hears me FB. That is not 100w its 12w! So when the noise floor is S3 and I am S8 (30-dB S/N) and the next guy is S9+10 it gets kinda crazy-funny doncha think! I even check into the Elecraft Sunday 20m net occassionally. Not real loud but once the antennas point up to me I get in. OK, I will be building a 300w sspa when I clear out the line-up of projects ahead of it. My cost est. is $2/watt not including cost of 28v PS. I've discussed what it is I am building, before. I don't really want to discuss it on the reflector. If you go to my website and click About KL7UW link, I list my future projects at the bottom of the page. 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw*, 432-100w*, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == *temp not in service __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] APF effectiveness...
I find the APF to be very effective when preceded by a relatively wider filter as suggested by K9ZTV, and offsetting the receive a little as mentioned by W6OPO. I generally use the 250 Hz crystal filter, followed by a DSP bandwidth between 200-300 Hz. I use a macro to turn on APF and FINE and offset the RIT by 20 Hz, then I tweak the APF shift and/or the RIT manually to peak the received signal. The purpose of the offset is to shift the signal frequency away from the ringing frequency. This works best for me at pitch settings near the low end of the K3's range. 73, Chuck Guenther NI0C W6OPO wrote: I have had input from two Elecraft support fellows one of which was helpful. That being move the receiver off frequency (RIT) about 10Hz then adjust the APF center frequency to match. Some help - yes. K9ZTV wrote: I've found that using the APF with the 400 filter (or wider) dialed-in provides less ringing than using APF with the 50 filter (DSP) dialed-in. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Replacement tuning knob for K2?
Jim, About a third way down the page at http://wilcoxengineering.com/amateur-radio/elecraft-k2 I mentioned the Yaesu FT-100 knob part numbers that I used in my K2. Cheers, Alan Alan D. Wilcox, W3DVX (K2-5373, K3-40) 570-321-1516 http://WilcoxEngineering.com http://eBookEditor.net https://www.smashwords.com/books/view/28062?ref=awilcox Williamsport, PA 17701 On 1/21/11 6:51 PM, Jim Lowman wrote: I guess I dropped off the list, and just re-subscribed. Some years ago there was a discussion about replacing the stock tuning knob on the K2 with a heavier one with a finger dimple. Could someone refresh my memory on what knob was used? I'm thinking about one that Ten-Tec sells; a heavier metal knob like I used to replace the stock knob on my Argonaut V and 516/6N2. Thanks in advance for any suggestions. 72/73 de Jim - AD6CW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] 120 vs 240
Having recently run 245 vac to my shack, I can say the HVPS runs well. Key down at 1400w on my 2m-8877 and the line voltage drops 5v (240 vs 245). I guess that is pretty good. I ran 40amp wiring (35-feet of #8awg 4-cond) and split out two 120vac 20A ckts to run some of the other ham equipment so that I am not loading the three outlets in the room so heavily. The room outlets run the computer stuff, rotators, lights, test equipment and workbench supplies. The 12v-50A, 28v-25A, and 8877 PS are run on the 245 vac ckt. It cost me about $300 for materials. I had to buy 100-feet of wire so that ran it up more than what I needed. But I made a emergency gen. 240v ext.cord out some of that. We have a 6500w Honda standby generator that powers the whole house. I could even run QRO on the gen. 73, Ed - KL7UW --- The quality of the 120V run makes a big difference. For example, if it's a 15A branch circuit feeding multiple outlets across several rooms -- and if wiring is formed with pressure-contact receptacles, -- and the receptacle you need is on the end of the string, don't count on a stiff supply. By contrast, if a dedicated 20A branch circuit is run only to the shack, uses clamp terminals, and the feed is shared between the amp and a few low-current devices, then output power should be more predictable with minimal voltage sag at the 500W level. Anyone considering a new 120V circuit to the shack to avoid these problems (in my case it was dimming lights) may want to consider pulling a companion 4-wire 240V circuit to handle all commercial amps, new and old. Paul, W9AC 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw*, 432-100w*, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == *temp not in service __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] (K3) RTTY offset ?
Hello Adriano, You didn't say whether you were using FSK D or AFSK A, or what software you were using. I will assume that when you say on the scope you mean on the waterfall in software such as MMTTY. If your radio is in FSK D, then it can receive on any frequency within the filter bandpass, but it can only transmit on one frequency - the one corresponding to the PITCH setting. If you click on a signal in the waterfall to receive it, the frequency you choose in the software's waterfall will probably not be the same as the one the radio will transmit on. If you use the K3's MONitor function to listen to your transmitted signal, you can hear whether the transmitted and received frequencies are the same. Depending on the software you are using and its capabilities, there are advanced methods to use mouse-tuning and AFC in FSK RTTY, but the simplest solution to this problem is never to use clicking in the waterfall to find a signal when you are using FSK. If you are CQing, you can use AFC to let your receiving software tune in callers who come back slightly off-frequency, but when you are planning to call someone else who is CQing you should turn AFC off. In MMTTY, you can use the HAM button to ensure that your receive frequency will be the same as your transmit frequency. You should configure the HAM default to be the same as the radio's PITCH setting. If your radio is in AFSK A, it can transmit on the same frequency it receives on, although the best frequency for both transmitting and receiving is the one in the PITCH setting and the HAM button. If you are using MMTTY software the easiest way to ensure that your transmit and receive frequencies are the same is to turn NET on. With NET on you can safely use mouse-clicking to tune in a signal to work. However, if you are calling CQ you should turn NET off, and use the HAM button before your first transmission to establish your transmit frequency. If the other station comes back off-frequency you can use AFC or a mouse-click to copy the other station's signal, but as soon as the QSO is completed you should click on the HAM button to return to your original transmit frequency. 73, Rich VE3KI PY2ADR wrote: Trying to config k3 on digi modes but i noted a offset between rx and tx ... When i find a sig on the scope i click on it and the rx is ok. Then i go tx and the \ station comes back in another qrg. Or when i call cq the stations comes back in \ another qrg __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] A Comment on my 500 Watt Comment
There's that 'rounding' thingy going again...:-) Gary On Wed, Jan 26, 2011 at 8:59 AM, ab2tc ab...@arrl.net wrote: I am sorry but I can't help myself on this one. Are you sure you don't mean $1994.99? :-) AB2TC - Knut Eric Swartz - WA6HHQ, Elecraft wrote: Correction to Tom's posting: I posted earlier this week that we would be targeting approximately $1,995. 73, Eric -- snip -- View this message in context: http://elecraft.365791.n2.nabble.com/A-Comment-on-my-500-Watt-Comment-tp5960071p5960913.html Sent from the [QRO] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -- Gary VK4FD - Motorhome Mobile http://www.qsl.net/vk4fd/ K3 #679 For everything else there's Mastercard!!! __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
QRP, 100 watts, or QRO at 500 watts+ -- they all have their place. If one is operating portable with batteries on a mountain hike, there is no other reasonable choice than QRP, and sometimes antennas are compromise for that situation too, but many do enjoy making a bunch of contacts in that environment. 100 watts (well somewhere between 50 and 100) is normal for me at the home station. I will drop to 5 watts if operating near the QRP watering holes just so I don't cover up other low power stations, but for most causal QSOs, I run between 50 and 100 watts. I will have an amplifier on the air someday (I have done 55 years of hamming without one), but it will be used when conditions warrant it. Yes, contests often warrant it, and when trying for that elusive DX in a pileup. However, I will continue to run near the 100 watt level most of the time. Some of the guys I talk to on 80 meter SSB tend to razz me about not running more power, but they can hear me, so why run more - if I am only S-7 on their meter, but perfectly Q5 copy, why should I run up the electric bill just because they are running the legal limit and bragging about their S-9+60 reports. I just don't see the point. Oh yes, some of these guys are running ESSB too, but I prefer to limit my bandwidth. Just because it can be done is not a valid reason to do it IMHO. To everything Turn, Turn, Turn --- To every thing there is a season, and a time to every purpose under the heaven: - based on the Book of Ecclesiastes and put to music by Pete Seegar in 1959. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I can't begin to tell you all the times on 40m from NY4A in a DX contest that the /QRP was all that I was getting, just because I could recognize the pattern. And, in Murphy-esque form the QRP station would waste all the QSB peaks on /QRP. I don't know why they bother. All the work is on my end. *I* should get extra points for copying QRP stations, as in the Stew Perry. If you want people to copy you on the other end when the path is minimal, do NOT send /QRP on your call. We ALREADY know you either aren't running any power, or are antenna-challenged, or the path is almost not there, or any or all of the above. /QRP *IS* a waste of time in a contest. Save it for casual QSO's when you know the other end can copy you. On Tue, Jan 25, 2011 at 5:09 PM, Rick Dettinger k7m...@gmail.com wrote: I agree with the first two. I appreciate a clean output from my transmitter and I would much rather use a bug. More fun! But /QRP is not redundant, if that is what I want to communicate, then I use it. I don't see it as a bad operating practice. I find that it encourages other QRP ops to give me a try. Those are often the most enjoyable contacts. 2 way QRP. 73, Rick K7milliwatt I will never understand why many still use straight keys, badly formed cw, and unnecessary verbiage (like /QRP, for example). 73, Pete N4ZR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] just 500W ?
To Nelson's point about the antenna, if you want accurate gain figures, you really should look at gain comparisons between a gain antenna at, say, 75 feet and a dipole at the same height. Using dBi figures is fantasy-land. Have you ever used an isotopic dipole? The Force 12 figures for antennas, such as the C31-XR, show dBd figures of maybe 7 dB gain. That's just a bit more than an S-unit better than a dipole at the same height. Those claims of 9 to 11 dBi are nonsense claims. Now, if you're using a stealth antenna, you are probably not coming close to a dipole at 75 feet. So, the difference between your wet noodle and a 3-element yagi at 60 feet will be quite noticeable. One advantage to using a gain antenna over an amplifier is that the gain is both ways - TX and RX. I know quite a few mobile ops who run 500 watts into a screwdriver antenna and are loud compared to mobile ops running 100 w into their screwdrivers. But, they don't hear one iota better (hi). Last point, as someone mentioned, the heavy lifting in QRP QSOs is the guy on the other hand. One contest that takes that into consideration is the Stew Perry. Both ops get extra credit for the QRP QSO. I think that's the most fair. Rob K6RB Interesting that little has been said about the ANTENNA. Power is only part of the equation, and I suspect that there is more dB gain from upgrading your antenna than upgrading your amplifier from 100 to 500 or 500 to 1500 watts. I've never operated with more than 600 watts power output, but I sure noticed the improvement when I switched from a HF6V to a TH-11. That station improvement took me from 305 confirmed to No. 1 Honor Roll. Yes, 1500 watts may get you there faster, but 500 watts is all you really need to do the job. Nelson, KU0A -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Hector Padron Sent: Tuesday, January 25, 2011 3:37 PM To: Wayne Burdick Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] just 500W ? Yeah,yeah,yeah, I know all about qrp,I started in hamradio when I was 13 years old,I am 62 now,you figure how long ago,my first QRP was a 6V6 tube oscilating with a xtal on 7005 and that thing made barely 2W and with a dipole I worked in less than a year more than 100 countries in CW from my CO land BUT those were years where the bands were not so crowded and they were not so noisy and the solar cycles were great BUT today with the hundred thousand stations filling the bands,the high band noise,the terrible propagation,QRP working is not the same,besides the courtesy of those old times its gone forever,bands are plagued by guys using full legal power OR MORE who has no respect for anybody and the actual rules is have power or not make a contact,most of the times unless you have a great beam antenna on 40M you won't do much with a QRP,you need to have those 500W from your amp or more.Its tough today to survive in the bands jungle sorrounded by lions who want to smash your poor signal and you only have a razor blade to defend yourself. Life is too short for QRP ! AD4C If freedom means something,it is the right to tell others what they don't want to hear George Orwell --- On Tue, 1/25/11, Wayne Burdick n...@elecraft.com wrote: From: Wayne Burdick n...@elecraft.com Subject: Re: just 500W ? To: Hector Padron ad4c2...@yahoo.com Cc: elecraft@mailman.qth.net Date: Tuesday, January 25, 2011, 8:10 PM The shirt I wear sometimes in the hamfests says up front : Life is too short for QRP In stark contrast, the first rig I built, when I was 13, was a 200-milliwatt-output crystal oscillator that used half a dozen parts with their leads twisted together. No PCB, no solder, no box. It was ugly. But it worked. I connected a hand key and a battery in series, paid out a roll of guy wire and tossed it on the roof, then started listening around the rig's 40-m frequency with my Hallicrafters SX101. A guy up in Los Angeles was calling CQ, and when he came back to me, I nearly fell off my chair. 200 miles on 200 mW, with an unmatched wire laying on the roof and a 9-V battery! A few months later someone gave me an HT37 transmitter (100 W). First thing I did was turn the drive down to nearly zero, measured my output at 200 mW, and worked New York (2500 miles) on 20 m. Life's not too short for *that* :) OTOH, I'm quite proud of our engineering staff's achievement with the KPA500. Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1202 / Virus Database: 1435/3400 - Release Date:
Re: [Elecraft] KPA500 - just 500 watts?
It's also great for those of us using indoor antennas, where 1500 watts is not a reality. Brian KD0HII 500 W (+) is the ideal output level for many operators and situations. Call it medium power, if you will -- but the KPA500 can get the job done, while taking up just a K3's worth of space on your desk. And you can pick it up and move it if you need to. 73, Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] ref in a pile up.
if i am the dx station and heard you trying to jump the line i can tell you you would be on the bottom of the list. arrl puts out a great paper called ethic's and operating procedure's that covers's just that problem. While working peacekeeping forces in the Army i watched a friend of mine become a rare one. with a very limited time frame he worked over 95 POLITE contact's and totally ignored 12 USA power station's who just knew with their power they had the right to jump ahead. He never did even say their call just had me put them in the black book. s/tony rowland __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 120 vs 240
I feel very fortunate My 240 panel is within 20' of the shack. I wired it myself and I think I spent $75 for all the hardware. Bill K9YEQ -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Edward R. Cole Sent: Tuesday, January 25, 2011 5:37 PM To: Elecraft@mailman.qth.net Subject: [Elecraft] 120 vs 240 Having recently run 245 vac to my shack, I can say the HVPS runs well. Key down at 1400w on my 2m-8877 and the line voltage drops 5v (240 vs 245). I guess that is pretty good. I ran 40amp wiring (35-feet of #8awg 4-cond) and split out two 120vac 20A ckts to run some of the other ham equipment so that I am not loading the three outlets in the room so heavily. The room outlets run the computer stuff, rotators, lights, test equipment and workbench supplies. The 12v-50A, 28v-25A, and 8877 PS are run on the 245 vac ckt. It cost me about $300 for materials. I had to buy 100-feet of wire so that ran it up more than what I needed. But I made a emergency gen. 240v ext.cord out some of that. We have a 6500w Honda standby generator that powers the whole house. I could even run QRO on the gen. 73, Ed - KL7UW --- The quality of the 120V run makes a big difference. For example, if it's a 15A branch circuit feeding multiple outlets across several rooms -- and if wiring is formed with pressure-contact receptacles, -- and the receptacle you need is on the end of the string, don't count on a stiff supply. By contrast, if a dedicated 20A branch circuit is run only to the shack, uses clamp terminals, and the feed is shared between the amp and a few low-current devices, then output power should be more predictable with minimal voltage sag at the 500W level. Anyone considering a new 120V circuit to the shack to avoid these problems (in my case it was dimming lights) may want to consider pulling a companion 4-wire 240V circuit to handle all commercial amps, new and old. Paul, W9AC 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw*, 432-100w*, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == *temp not in service __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I love QRP but run THP 2.5kfx generally in the evening on 75m as I cannot be heard well without the 1.5KW out. I don't like the life's too short for QRP statement as I have had some of my best contacts at less than 2W. I usually run 2W or less. I love 100 MW! Bill K9YEQ -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Tuesday, January 25, 2011 5:55 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 - just 500 watts? QRP, 100 watts, or QRO at 500 watts+ -- they all have their place. If one is operating portable with batteries on a mountain hike, there is no other reasonable choice than QRP, and sometimes antennas are compromise for that situation too, but many do enjoy making a bunch of contacts in that environment. 100 watts (well somewhere between 50 and 100) is normal for me at the home station. I will drop to 5 watts if operating near the QRP watering holes just so I don't cover up other low power stations, but for most causal QSOs, I run between 50 and 100 watts. I will have an amplifier on the air someday (I have done 55 years of hamming without one), but it will be used when conditions warrant it. Yes, contests often warrant it, and when trying for that elusive DX in a pileup. However, I will continue to run near the 100 watt level most of the time. Some of the guys I talk to on 80 meter SSB tend to razz me about not running more power, but they can hear me, so why run more - if I am only S-7 on their meter, but perfectly Q5 copy, why should I run up the electric bill just because they are running the legal limit and bragging about their S-9+60 reports. I just don't see the point. Oh yes, some of these guys are running ESSB too, but I prefer to limit my bandwidth. Just because it can be done is not a valid reason to do it IMHO. To everything Turn, Turn, Turn --- To every thing there is a season, and a time to every purpose under the heaven: - based on the Book of Ecclesiastes and put to music by Pete Seegar in 1959. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] ref in a pile up.
Gee Tony, how do you take a number and queue up in a pile-up? 73, Ken, K6LA / VY2TT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Replacement tuning knob for K2?
I used an FT-900 knob on my K2 for a while and enjoyed it -- The FT-900 knob is larger than the FT-100 knob. I have since reverted to the stock K2 knob, but with the addition of an FT-900 tire around it to protect my tuning thumb from the sharp corner of the stock K2 knob. The FT-100 tire will also fit on the K2 knob, but it is more of a stretch than the FT-900 tire. I know the FT-900 knob is no longer available from Yaesu, but the tires may be. I have no current information about the FT-100 knob not its tire. If you do use an FT-100 knob, break off the plastic pin in the shaft recess so it mounts closer to the K2 front panel. 73, Don W3FPR On 1/25/2011 6:31 PM, Alan D. Wilcox wrote: Jim, About a third way down the page at http://wilcoxengineering.com/amateur-radio/elecraft-k2 I mentioned the Yaesu FT-100 knob part numbers that I used in my K2. Cheers, Alan __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 build sequence
Later this year, I plan to order a K3/10 Kit, KAT3 internal Antenna Tuner, and optional filters for CW, then add the 100 Watt Upgrade, General Coverage RX Bandpass Module, and other options as money allows. If possible, I'd like to avoid major disassembly for installation of future options by installing them in the initial build. Lesson learned with an old Thunderbird that needed a heater core replaced; half the insides had to come out just to get to the thing; don't want to do that again. Which options, if any, require major disassembly of the K3? Eventually I'll need SSB and 2 meter capability. Any recommendations for a first time builder would be appreciated. 73, Dwayne, KE5EFY __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
Hi Bill, I too would love to run at 100MW but the electricity bill would be a real killer! :-) On the other hand, 100mW may be a better proposition though and alot of fun can be had at that power level too. (I run my K3/100 barefoot, have a look at the grossly inflated prices various Australian suppliers charge for gear here and you'll know why most Aussies dont run more than 100W.) Jeff Cochrane - VK4BOF Innisfail, QLD, Australia Elecraft K3# 4257 - Original Message - From: Bill K9YEQ To: d...@w3fpr.com ; elecraft@mailman.qth.net Sent: Wednesday, January 26, 2011 10:09 AM Subject: Re: [Elecraft] KPA500 - just 500 watts? I love QRP but run THP 2.5kfx generally in the evening on 75m as I cannot be heard well without the 1.5KW out. I don't like the life's too short for QRP statement as I have had some of my best contacts at less than 2W. I usually run 2W or less. I love 100 MW! Bill K9YEQ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
Hi Paul Thats what I am more interested in, the IMD performance of the future KPA500. I own a Harris RF355 that I would like to replace with a solid state amp. I use this AMP in my remote station. It is a maintenance headache with limited integration potential. Unfortunately non of the solid state offerings on the market have acceptable IMD performance. I seriously doubt that there will ever be a solid state amplifier manufactured for the ham market that will approach the IMD performance of the the Harris RF355 with the single 3cx800. I wish Acom would produce a Autotune amplifier that uses a pair of 3cx800PX's At least the IMD performance would be a certainty. I dont know what devices the KPA500 uses? 73 John --- On Tue, 1/25/11, Paul Christensen w...@arrl.net wrote: From: Paul Christensen w...@arrl.net Subject: Re: [Elecraft] KPA500 - just 500 watts? To: elecraft@mailman.qth.net Date: Tuesday, January 25, 2011, 8:47 AM Speaking of dollars per watt, I'm presently using a homebrew pair of 813's which produce 800 watts (QSK but no 6M) and I have less than $400 into it. $0.50 dollars per watt. Impressive, Vic. I would love to see some photos of your amp! In addition to the price/watt factor, perhaps equally important is a figure that takes into account price in relation to IMD in -dBc per $. Paul, W9AC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA500 - just 500 watts?
Hi Brian, Yes, correct. I live in high rise apartment in urban area of Hong Kong overlooking the spectacular Victoria Harbour. I have my hamstick mounted on the window frame. I have never turned my ICPW1to full 1KW power which is a waste to my linear. KPA500 seems suitable for my case. I am awaiting further details so as to decide between it and SPE Expert 1ka. I will look at the total costs of KPA500 + KAT500 for comparison. I trust the decision of Elecraft for just 500 watts could be as follows; 1. the most marketable segment in terms of price and RF power; 2. the kit version can be easily handled by most kit builders; 3. the kit version will have same performance as the assembled version; 4. material costs of KPA500 are reasonably cheap but with reliable quality leading to higher profit margin 5. the shipping weight of the end product is not prohibitively heavy so that overseas sales are possible. Wayne is a good RF engineer whereas Eric is a good business man (Sorry, I don't use the word 'excellent' because I would like to push them harder !!). I am always interested in Elecraft's business proposition and sometimes use it as case study in business school during my part time lecturing. 73 Johnny VR2XMC 寄件人﹕ Brian Linn br...@brianlinn.com 收件人﹕ Elecraft Reflector elecraft@mailman.qth.net 傳送日期﹕ 2011/1/26 (三) 7:59:59 AM 主題： Re: [Elecraft] KPA500 - just 500 watts? It's also great for those of us using indoor antennas, where 1500 watts is not a reality. Brian KD0HII 500 W (+) is the ideal output level for many operators and situations. Call it medium power, if you will -- but the KPA500 can get the job done, while taking up just a K3's worth of space on your desk. And you can pick it up and move it if you need to. 73, Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3: APF effectiveness
...perhaps less gain and a little wider BW or give the user the tools to do it ourselves. I was thinking exactly that myself last night on 160m - no problem with the bandwidth, but I'd gladly give up a db or two of APF gain to reduce the ringing. Because of the ringing, I can hear signals that aren't even there! Ralph, VE7XF __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA500 - just 500 watts?
Hello Jeff, Perhaps, this explains why parallel importers (grey importers) can survive in Australia. These parallel importers even have their own technical teams, highly qualified technicians to provide product warranty on their own. cheers, Johnny VR2XMC 寄件人﹕ Jeff Cochrane - VK4BOF vk4bof.elecr...@gmail.com 收件人﹕ elecraft@mailman.qth.net 傳送日期﹕ 2011/1/26 (三) 8:38:02 AM 主題： Re: [Elecraft] KPA500 - just 500 watts? Hi Bill, I too would love to run at 100MW but the electricity bill would be a real killer! :-) On the other hand, 100mW may be a better proposition though and alot of fun can be had at that power level too. (I run my K3/100 barefoot, have a look at the grossly inflated prices various Australian suppliers charge for gear here and you'll know why most Aussies dont run more than 100W.) Jeff Cochrane - VK4BOF Innisfail, QLD, Australia Elecraft K3# 4257 - Original Message - From: Bill K9YEQ To: d...@w3fpr.com ; elecraft@mailman.qth.net Sent: Wednesday, January 26, 2011 10:09 AM Subject: Re: [Elecraft] KPA500 - just 500 watts? I love QRP but run THP 2.5kfx generally in the evening on 75m as I cannot be heard well without the 1.5KW out. I don't like the life's too short for QRP statement as I have had some of my best contacts at less than 2W. I usually run 2W or less. I love 100 MW! Bill K9YEQ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 - just 500 watts?
I agree with Bill that working QRP stations can be a lot of fun. Like when I received this email: Hi Dave! Just a heads up that I was using 300 milliwatts to a G5RV (@80ft) with a Small Wonders Lab Rockmite 20 to work you @ 2304 on 14.059 - will qsl via lotw...TU for digging me out! You are the 2nd best distance I have with this little rig... NICE EARS OM! 72 de k7hv/qrpp I distinctly remember working him. He was very weak, but I was able to pull him out. Little did he know -- I was using a K3! Dave, N4QS - Original Message - From: Bill W4ZV btipp...@alum.mit.edu To: elecraft@mailman.qth.net Sent: Tuesday, January 25, 2011 5:08 PM Subject: Re: [Elecraft] KPA500 - just 500 watts? Pete Smith N4ZR wrote: And I think a lot of the skill should be credited to the ops on the other end who manage to pull out the QRP stations. I agree. Most of the credit should go the the station that copies QRP stations. It's one thing to generate a weak signal but entirely another to be able to *receive* weak signals. IMHO the latter is MUCH more difficult ...and more satisfying to me personally. I enjoy operating QRP from portable sites using makeshift antennas but I give 99% of the credit to the guy on the other end. 73, Bill P.S. I run 1.5 kW on Topband but always get a thrill working QRP callers. http://www.eham.net/articles/10078 -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA500-just-500-watts-tp5959017p5960939.html Sent from the [QRO] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 build sequence
Hi Dwayne, SSB is already in the K3, no extra's are needed. (The mandatory 2.7KHz 5 pole filter will do the job for you initially, upgrade it later at your leisure) The 2M capability requires the KXV3A be fitted so it is probably a good idea to get that for the initial build. The 2m transvertor is a snap to install, it's a matter of 2 or 3 TMP cables + a power connection and your basically done once the KXV3A is there. Good luck with it and welcome to the Elecraft fraternity! Jeff Cochrane - VK4BOF Innisfail, QLD, Australia Elecraft K3# 4257 - Original Message - From: Dwayne Rohmer To: elecraft@mailman.qth.net Sent: Wednesday, January 26, 2011 10:29 AM Subject: [Elecraft] K3 build sequence Later this year, I plan to order a K3/10 Kit, KAT3 internal Antenna Tuner, and optional filters for CW, then add the 100 Watt Upgrade, General Coverage RX Bandpass Module, and other options as money allows. If possible, I'd like to avoid major disassembly for installation of future options by installing them in the initial build. Lesson learned with an old Thunderbird that needed a heater core replaced; half the insides had to come out just to get to the thing; don't want to do that again. Which options, if any, require major disassembly of the K3? Eventually I'll need SSB and 2 meter capability. Any recommendations for a first time builder would be appreciated. 73, Dwayne, KE5EFY __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] order of assembly
Dwayne, I built a K3 with all the bells and whistles, including the 144 transverter. My experience was on a Buick, not a TBird, but the lesson was the same. First, I built the K3 with almost none of the options. Tested it and got it on the air. Then I added the audio board and tuner. Tested on the air. Then the amp. Then the subreceiver. Then the 144 transverter. It took several months, but each time I learned something new about the K3. The disassembly is simple and straightforward. I wouldn't worry about the order except for the filters. Those require the most disassembly, so put all of them in at once. I decided to add the AM filter after everything was done. It took about 2 hours. Good luck with the K3. And don't forget to drain the coolant and antifreeze before you remove the hoses. 73 Stan __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3: APF effectiveness
What you're describing (hear signals that aren't even there) sounds to me like the APF is working just as intended. You're hearing faint ringing at your sidetone frequency when no signal is present. When a signal is present and tuned in, it will have precisely that same tone but will pop further out of the noise than that phantom signal. It just demands a little practice and patience along with fine tuning. If someone wants a lower Q APF with less gain, they should try a dsp width of 50hz without APF. 73, Barry N1EU Ralph Parker wrote: ...perhaps less gain and a little wider BW or give the user the tools to do it ourselves. I was thinking exactly that myself last night on 160m - no problem with the bandwidth, but I'd gladly give up a db or two of APF gain to reduce the ringing. Because of the ringing, I can hear signals that aren't even there! -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-APF-effectiveness-tp5961155p5961190.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 build sequence
Hi Dwayne, About the only option that gets in the way of others in the K3 is the KRX3 (the 2nd receiver), and you didn't explicitly mention that on your list. The 2nd RX must be removed to install the general coverage bandpass module in the main RX and to install additional filters in the main rig. But that said, removing the 2nd RX is about a 10 minute job, so even worst case it's not a big deal. Without the 2nd RX, I think you'll be astonished at how empty the K3 is inside. Adding options after the initial build really isn't much of a chore. It's closer to replacing the gas cap than replacing the heater core on that old T-Bird. 73 -- Joe KB8AP On Jan 25, 2011, at 4:29 PM, Dwayne Rohmer wrote: Later this year, I plan to order a K3/10 Kit, KAT3 internal Antenna Tuner, and optional filters for CW, then add the 100 Watt Upgrade, General Coverage RX Bandpass Module, and other options as money allows. If possible, I'd like to avoid major disassembly for installation of future options by installing them in the initial build. Lesson learned with an old Thunderbird that needed a heater core replaced; half the insides had to come out just to get to the thing; don't want to do that again. Which options, if any, require major disassembly of the K3? Eventually I'll need SSB and 2 meter capability. Any recommendations for a first time builder would be appreciated. 73, Dwayne, KE5EFY __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3: APF effectiveness
Ralph, You have heard that to reduce the ringing, increase the DSP bandwidth. The 50 Hz filter width has a bit of ringing by itself, so add the APF and the situation becomes more pronounced. You can't have your cake and eat it too. The bit of ringing will bring out weak signals just like the old Q-Multiplier used to do (and it caused ringing). The APF was not intended to be used full-time, turn it on only when it will help -- besides, it is too sharp for tuning around. 73, Don W3FPR On 1/25/2011 7:40 PM, Ralph Parker wrote: ...perhaps less gain and a little wider BW or give the user the tools to do it ourselves. I was thinking exactly that myself last night on 160m - no problem with the bandwidth, but I'd gladly give up a db or two of APF gain to reduce the ringing. Because of the ringing, I can hear signals that aren't even there! Ralph, VE7XF __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 build sequence
Dwayne, Since you did not mention the SubRX, you can add those options in any order. The problem with the SubRX is that it sits on top of the main receiver, and must be removed to add options (such as filters and RX Bandpass) to the main. If you later choose the SubRX, make that one of the later additions and your task will be an easy one. Even the removal of the subRX is not a great ordeal, but it is a bother. SSB and all other modes come with the basic K3, there are no options involved for those modes. 73, Don W3FPR On 1/25/2011 7:29 PM, Dwayne Rohmer wrote: Later this year, I plan to order a K3/10 Kit, KAT3 internal Antenna Tuner, and optional filters for CW, then add the 100 Watt Upgrade, General Coverage RX Bandpass Module, and other options as money allows. If possible, I'd like to avoid major disassembly for installation of future options by installing them in the initial build. Lesson learned with an old Thunderbird that needed a heater core replaced; half the insides had to come out just to get to the thing; don't want to do that again. Which options, if any, require major disassembly of the K3? Eventually I'll need SSB and 2 meter capability. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Replacement tuning knob for K2?
You're so right, Don. I forgot all about that goofy little pin that I had to break off! Alan Alan D. Wilcox, W3DVX (K2-5373, K3-40) 570-321-1516 http://WilcoxEngineering.com http://eBookEditor.net https://www.smashwords.com/books/view/28062?ref=awilcox Williamsport, PA 17701 On 1/25/11 7:15 PM, Don Wilhelm wrote: I used an FT-900 knob on my K2 for a while and enjoyed it -- The FT-900 knob is larger than the FT-100 knob. I have since reverted to the stock K2 knob, but with the addition of an FT-900 tire around it to protect my tuning thumb from the sharp corner of the stock K2 knob. The FT-100 tire will also fit on the K2 knob, but it is more of a stretch than the FT-900 tire. I know the FT-900 knob is no longer available from Yaesu, but the tires may be. I have no current information about the FT-100 knob not its tire. If you do use an FT-100 knob, break off the plastic pin in the shaft recess so it mounts closer to the K2 front panel. 73, Don W3FPR On 1/25/2011 6:31 PM, Alan D. Wilcox wrote: Jim, About a third way down the page at http://wilcoxengineering.com/amateur-radio/elecraft-k2 I mentioned the Yaesu FT-100 knob part numbers that I used in my K2. Cheers, Alan __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2 DSP
When I set the DSP to bypass and turn rig off and back on, it is not in bypass mode. Is this normal or am I missing something? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
