[Elecraft] Interfaces
I am glad that I started soundcard programs way back before commercial interfaces were born. It is so simple to make. I bought two 600-ohm pc board 1:1 audio transformers from RS and one 2n3904, some resistors and caps. That was to set up my FT-847 on psk-31. I then used the interface to run the WSJT suite of programs. When it came time to interface my K3, it was way more simple: connect line-in and line out audio with standard computer cables and connect a RS-232 patch cable with sub-D 9-pin connectors. Of course I have a computer with a RS-232 serial port and run winXP. I guess it you are using a brand new win7 quad-core computer with only USB ports it might be more difficult. You would have to get a USB/RS-232 cable. I have more problems with finding the dialog boxes in the computer to adjust audio in/out levels. 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 Amp Key configuration request
H . . . can you route the RCA-connector enable-cable from the K3 thru the tuner-amp-disable contact connectors thence to the amp? Btdt with Alpha and Ten Tec. Hth. Brgds, Dave, N3HE -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Amp-Key-configuration-request-tp5908796p5910413.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] [K2] K2/KPA100 build for K2-7006
Thanks Richard (AD7FZ) for the replacement parts. Elecraft rocks! 73, David AJ4TF On Mon, 2011-01-10 at 00:22 -0500, david wrote: So far so good. The KPA100 passed the first functional test without issue. The only thing I have run into is that I was missing one small capacitor, and one of the toroid cores was cracked... I didn't notice it until I started winding it and it fell apart. The Elecraft parts department has an email in their in-box (two, actually). I am now up to the steps just after installing and winding the large output transformer. Kudos (again) for the excellent instructions! 73, David Macchiarolo AJ4TF __ 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 Amp Key configuration request
Please add my name to this request. I have the same setup as Phil and Roger. It would sure be handy if the amp enable line setting could be custom configured to adapt to this specific environment. Lu - W4LT K3 # 3192 Subject: Re: [Elecraft] K3 Amp Key configuration request To: Phil Debbie Salas dpsa...@tx.rr.com Cc: elecraft@mailman.qth.net Message-ID: 4d2ba00d.2090...@roadrunner.com Content-Type: text/plain; charset=ISO-8859-1; format=flowed Phil Debbie Salas wrote: I use my K3 with an Ameritron ALS-600 amplifier and MFJ-998 autotuner (hey, the KPA-500 and KAT-500 aren't available yet). Anyway, I tune the MFJ-998 by leaving it in the full auto position and then just press TUNE on the K3. I set my K3 TUNE power for 15 watts which is a perfect level for the MFJ-998. However, the amp enable line on the K3 goes low even when using TUNE, and so I must remember to place the amp in standby before checking and tuning SWR. Otherwise the amp will put out power momentarily (60-100 watts) until the MFJ-998 interrupts the amp-key line if it needs to tune. It would be nice if the amp-enable output of the K3 would not go low when using TUNE on the K3. Maybe a menu set-up option? Phil - AD5X __ Same situation here. I'd like to see this too. 73, Roger No virus found in this outgoing message Checked by PC Tools AntiVirus (6.1.0.25 - 6.14880). http://www.pctools.com/free-antivirus/ __ 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 PA temp widely varying ERR12v
Early this SAT morning gettin gready to play in NAQP code I fired up both K3's, the logging PC and such. I started double checking SO2R setup in N1MM when all of a sudden radio #1 (K3 sn 594) flashed the ERR 12v message, and I think it said CHECK CIRCUIT BREAKER etc. I looked at circuit breaker and it was not tripped. After a few other general checks I looked at the PA Temp and it was wildly fluctuating with readings displayed such as -3 then to +30 then 5 then +35 back to 23 then -4 then +27 and kept this , all the while in just receive mode. (For reference I looked at radio #2 (K3) and the PA temp was perfectly steady at 23, just sitting idle in receive mode.) Are these two issues related? The PA temp fluctuation is my real concern. As FYI the radio has worked flawlessly the past couple years, but coincidentally it just came back from the factory having several mods performed along with a couple new options installed. I searched and read the reflector's past comments on the more common ERR12v causes regarding the circuit breaker lugs and the multipin connector being tin vs gold, etc. I will check these later when I can open up radio. Any comments? Ron N5QQ __ 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 Amp Key configuration request
Why not set the tune to 1-2W? K3 allows for this as opposed to nearly all other radios. The number of software options in K3 is reaching the sky and many problems of current operators stem from not remembering options that were turned on by mistake. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Amp-Key-configuration-request-tp5908796p590.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] RX antenna (K3)
DX Eng makes good stuff, Adriano, and I would think this to be a good vertical active whip. You might want to also check out the active whip from Clifton Labs. It is also a high quality unit with good overload characteristics and ability to automatically turn off during Xmit periods. Available as a kit and much less expensive than the DX Eng, even with the coax DC coupling unit. I have one 50 ft away from my xmit antennas at 100 W and have no problem. Another possibility you might want to explore is a K9AY loop array, even if not full size. This will give you the advantages of less RX noise than an active whip and significant selectable directionality on the low bands. I use one of these also and prefer it to the whip on 160 thru 30. They are commercially available, but can also be easily homebrewed. I use a homebrewed downsized K9AY and the active whip together as a diversity RX system with the K3. 73 Craig AC0DS __ 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] RX antenna (K3)
The DXE NCC1 is also a nice unit that gives the ability to adust the phase between two rx antennas. I use one with two of the clifton labs active antennas and also installed two of Jack's new HP filters in the NCC1 (It has provisions for filters but DXE decided not to build the filters). 73 Greg AB7R On Tue, Jan 11, 2011 at 7:21 AM, Craig D. Smith cr...@powersmith.netwrote: DX Eng makes good stuff, Adriano, and I would think this to be a good vertical active whip. You might want to also check out the active whip from Clifton Labs. It is also a high quality unit with good overload characteristics and ability to automatically turn off during Xmit periods. Available as a kit and much less expensive than the DX Eng, even with the coax DC coupling unit. I have one 50 ft away from my xmit antennas at 100 W and have no problem. Another possibility you might want to explore is a K9AY loop array, even if not full size. This will give you the advantages of less RX noise than an active whip and significant selectable directionality on the low bands. I use one of these also and prefer it to the whip on 160 thru 30. They are commercially available, but can also be easily homebrewed. I use a homebrewed downsized K9AY and the active whip together as a diversity RX system with the K3. 73 Craig AC0DS __ 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] RX antenna (K3)
Craig I'm most interested in your system and I wonder if you could describe it further. What size is your loop and do you use a separate phasing unit before injecting the result into the K3 rx input? David G3UNA Another possibility you might want to explore is a K9AY loop array, even if not full size. This will give you the advantages of less RX noise than an active whip and significant selectable directionality on the low bands. I use one of these also and prefer it to the whip on 160 thru 30. They are commercially available, but can also be easily homebrewed. I use a homebrewed downsized K9AY and the active whip together as a diversity RX system with the K3. 73 Craig AC0DS __ 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] crystal filters bag discarded
I divided all the components of rf board bags into parts boxes (really handfull!), but in this way i discarded the crystal filters bag with the number necessary for alignment as indicated on page 54 of the manual. What can i do??? On the crystals is written this: ECSX V 4.9136-S CHINA K8 Tnx for help Pippo IZ2NYY __ 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 Amp Key configuration request
Ignacy wrote: Why not set the tune to 1-2W? K3 allows for this as opposed to nearly all other radios. The number of software options in K3 is reaching the sky and many problems of current operators stem from not remembering options that were turned on by mistake. Ignacy, NO9E I think you would find that, with a remote coupler and a low drive linear, 2 watts would not be enough for the coupler to tune properly and if the linear was in line, the output might be too much for the couplers relays to handle safely. 73, Roger __ 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 PA temp widely varying ERR12v
Hi Ron, Yes, I would say they are related. From the owner's manual section on troubleshooting transmit problems: ... low voltage may cause an erroneous temperature reading... The ERR 12V message also indicates low voltage. I think you're on the right track checking the circuit breaker lugs, etc., but be sure to check the obvious things first, like measuring the supply voltage, making sure the connections on the power cord are tight, etc. 73 -- Joe KB8AP On Jan 11, 2011, at 6:42 AM, Ron N5QQ wrote: Early this SAT morning gettin gready to play in NAQP code I fired up both K3's, the logging PC and such. I started double checking SO2R setup in N1MM when all of a sudden radio #1 (K3 sn 594) flashed the ERR 12v message,...I looked at the PA Temp and it was wildly fluctuating with readings displayed such as -3 then to +30 then 5 then +35 back to 23 then -4 then +27 and kept this , all the while in just receive mode Are these two issues related? The PA temp fluctuation is my real concern. ... Any comments? Ron N5QQ __ 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] RES: Yamaha CM500
I use CM500 for few months now. I don't hear difference between Heil proset and CM500. Microphone is a bit different and TX EQ needed to be adjusted and mic gain reduced significantly. But the main CM500 advantage, aside from being 3 times cheaper than the Heil, they are much more comfortable, I can wear them for more than 10 hours straight during contest, while Heil would kill my ears after 3-4 hours. 73, Igor, N1YX - Original Message - From: Robert Harmon k...@pacbell.net To: Gary Gregory garyvk...@gmail.com Cc: elecraft@mailman.qth.net Sent: Tuesday, January 11, 2011 2:28:55 AM Subject: Re: [Elecraft] RES: Yamaha CM500 O.K. you guys, now you've done it. I have to try the C-500 phones too. :) Bob K6UJ __ 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] [K2] crystal filters bag discarded
Pippo, Just assume the bag was marked with 3.7. That is the most common, and is close enough to get you through the process. After the K2 is complete and the KSB12 is installed (if you are adding that option), I recommend you refine your filter alignment in any case - Use Spectrogram and some type of noise generator (the N-Gen is ideal). The instructions are on my website www.w3fpr.com in the article on K2 Dial Calibration. 73, Don W3FPR On 1/11/2011 11:49 AM, IZ2NYY wrote: I divided all the components of rf board bags into parts boxes (really handfull!), but in this way i discarded the crystal filters bag with the number necessary for alignment as indicated on page 54 of the manual. What can i do??? On the crystals is written this: ECSX V 4.9136-S CHINA K8 Tnx for help Pippo IZ2NYY __ 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, LP-Bridge, SteppIR BiggIR antenna
Hi John. First, make sure that you are using the top port on the SteppIR controller. Second, you can't use a standard cable. The SteppIR requires a special cable which you can make yourself. It needs to be 3-wire null modem (crossover), with pins 79 tied together on the SteppIR side. Here is a rough sketch of how it works... SteppIR end ... PC end - 1 - 2 2 - 1 5 - 5 7 I 9 You can also try a Y cable on the K3 side of the USB adapter, but you'll have to set the baud rate in the SteppIR controller to 38,400 if that's possible. There are subtle advantages to using the LP-Bridge output, as long as you always have LP-Bridge running. 73, Larry N8LP On 1/11/2011 12:00 PM, elecraft-requ...@mailman.qth.net wrote: Date: Mon, 10 Jan 2011 23:25:59 -0500 From: John Gaynardjgayn...@columbus.rr.com Subject: [Elecraft] K3, LP-Bridge, SteppIR BiggIR antenna To:elecraft@mailman.qth.net Message-ID:04ae01cbb147$a6087e80$f2197b...@columbus.rr.com Content-Type: text/plain; charset=us-ascii I have the LP-Bridge functioning with the logger. I now need to get it working with the SteppIR. The K3 connects to the computer via the COM1 port. I have the current K3 USB serial cable connected to the SteppIR via COM9 port using a serial extension cable with DB9 F to DB9F adapter to match up with the DB9M connector on the K3 USB cable. The SteppIR is set to Kenwood command set and 4800bps. The SteppIR is not responding to frequency changes on the K3. I see the USB serial output on the LP-Bridge port display. John K8WDN __ 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] help with DX4WIN
I got no help from the DX4WIN reflector on this. Maybe (hopefully) someone here can help? I use DX4WIN 8.08 and a K3. I have been experiencing an oddity that I have not been able to resolve: With K3 tuned to 3500.0, if I double click on a spot at 3503.5 the K3 goes to 3503.5. No problem. With the K3 in the CW portion of the band (e.g. 3503.5) if I double click on a spot at 3800.0 the K3 goes to 3800.65. With the radio in the SSB portion of the band (e.g. 3800.0) if I double click on a spot at 3503.5 the K3 goes to 3502.85. I am getting a 650 Hz offset whenever the K3 changes modes. This happens in DX4WIN, but not in N1MM. Neither RIT nor XIT are on. Anyone have an idea where this is coming from? Thanks, Wayne, N1WR, K3 s/n 1945 __ 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] help with DX4WIN
Wayne, I would wager that you have your CW pitch set to 650 Hz, either in the K3 or in DX4WIN or both. Then I would guess that DX4WIN is changing the mode first and then changing the frequency. Done that way, the frequency can be off by the amount of the sidetone pitch. If the frequency is changed first, and then the mode, the K3 should follow along nicely. (I an guessing at the order which causes this situation, I may have it backwards). The developer of N1MM has worked closely with Elecraft to iron out little things like this - apparently the author of DX4WIN has not done the same. 73, Don W3FPR On 1/11/2011 1:58 PM, Wayne Rogers wrote: I got no help from the DX4WIN reflector on this. Maybe (hopefully) someone here can help? I use DX4WIN 8.08 and a K3. I have been experiencing an oddity that I have not been able to resolve: With K3 tuned to 3500.0, if I double click on a spot at 3503.5 the K3 goes to 3503.5. No problem. With the K3 in the CW portion of the band (e.g. 3503.5) if I double click on a spot at 3800.0 the K3 goes to 3800.65. With the radio in the SSB portion of the band (e.g. 3800.0) if I double click on a spot at 3503.5 the K3 goes to 3502.85. I am getting a 650 Hz offset whenever the K3 changes modes. This happens in DX4WIN, but not in N1MM. __ 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 PA Temp
Fred: Dumb question, but you wouldnt have one or both of the following conditions: 1 - Fan speed on FN1 for noise abatement and not on AUTO, or: 2 - Something like a monitor base or a radio interface sitting over the grille on the top of the radio's cabinet, thus blocking or severely restricting the fresh air intake to the fans? The fans on my rig suck air OUT of the cabinet, and intake air from the top through the grille, over the PA Heatsink fins and then exhaust it out the back, not the other way around... the grille at the top of the radio is the air intake. Kind of counter intuitive (after all, hot air rises) but that's the way it is... I run the fans full blast all the time by setting them at FN4. For me, the more air they move, the better. In my station environment (boom mic headset 99.999% of the time), the noise is not a problem. For transmission noise abatement, there is always TX GATE :) -lu-w4lt- K3 #3192 From: Fred Jensen k6...@foothill.net Subject: [Elecraft] K3 PA Temp To: Elecraft Reflector elecraft@mailman.qth.net Date: Sunday, January 9, 2011, 1:24 PM Playing around in the RTTY RU after a full effort in NAQP CW yesterday. ? PA temp @100W gets up to about 56C while CQ'ing, so I backed off to 80W.? Anyone know how hot is too hot? 73, Fred K6DGW - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - http://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
[Elecraft] K2 BFO Tune Up
Hi All, Just completed assembling my K2 kit I had on the shelf for 7 years SN 3089. After engineering a cap change to get the VCO voltage correct (C72 from 270 to 300pf) it appears to work now. I went through the tuning OK but wanted to ask if there is a better way to adjust the BFO so that all of the filters peak on the same frequency? In looking at the old emails about tuning the filters only to find that the Spectrum APP is not available anymore, can someone point me to a procedure that can aid in this endeavor? Thanks in advance, Dave Anderson, K4SV Tryon, NC 828 777-5088 www.K4SV.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] K2 BFO Tune Up
Dave, Go to my website www.w3fpr.com, and look at the article dealing with K2 Dial Calibration - it includes the filter setting, but you may as well do the whole thing and have good dial calibration as well. Spectrogram is available for download at Tom Hammond's website www.n0ss.net, and Tom has some nice documentation with setup information and screenshots. You can expect as much as 20 Hz variation in pitch as you change from filter to filter since it is limited by the DAC resolution. That is not enough variation to be troublesome, but is disconcerting the first time you hear it. If you have more than 20 Hz, the BFOs are not set up right. I hope you are not iced in there today, we have a nice slick sheet here in Wake Forest. 73, Don W3FPR On 1/11/2011 2:34 PM, Dave Anderson, K4SV wrote: Hi All, Just completed assembling my K2 kit I had on the shelf for 7 years SN 3089. After engineering a cap change to get the VCO voltage correct (C72 from 270 to 300pf) it appears to work now. I went through the tuning OK but wanted to ask if there is a better way to adjust the BFO so that all of the filters peak on the same frequency? In looking at the old emails about tuning the filters only to find that the Spectrum APP is not available anymore, can someone point me to a procedure that can aid in this endeavor? Thanks in advance, Dave Anderson, K4SV Tryon, NC 828 777-5088 __ 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] help with DX4WIN
In the K3's CONFIG:CW WGHT configuration item, what is your setting for automatic VFO offset on SSB/CW mode changes (changed by tapping the 5 button)? If this option is set to VFO OFS and the frequency change is performed before the mode change, the mode change will result in an offset equal to your CW sidetone pitch. If this option is set to VFO NOR, or if the mode change is performed before the frequency change, there will be no such offset. This could account for both the offset and the difference between the two software programs. 73, Rich VE3KI On 1/11/2011 1:58 PM, Wayne Rogers wrote: I got no help from the DX4WIN reflector on this. Maybe (hopefully) someone here can help? I use DX4WIN 8.08 and a K3. I have been experiencing an oddity that I have not been able to resolve: With K3 tuned to 3500.0, if I double click on a spot at 3503.5 the K3 goes to 3503.5. No problem. With the K3 in the CW portion of the band (e.g. 3503.5) if I double click on a spot at 3800.0 the K3 goes to 3800.65. With the radio in the SSB portion of the band (e.g. 3800.0) if I double click on a spot at 3503.5 the K3 goes to 3502.85. I am getting a 650 Hz offset whenever the K3 changes modes. This happens in DX4WIN, but not in N1MM. __ 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] help with DX4WIN
Wayne, As I said, I had this problem a few months ago. Here is the solution from Rich, VE3KI: What is your setting for CONFIG:VFO OFS (see CONFIG:CW WGHT in the manual)? If you have CONFIG:VFO OFS turned on, the mode change between SSB and CW will cause the dial frequency to jump by the CW sidetone pitch. As I recall, I just turned OFS off in the K3 and everything was back to normal. 73, Dave, N4QS I got no help from the DX4WIN reflector on this. Maybe (hopefully) someone here can help? I use DX4WIN 8.08 and a K3. I have been experiencing an oddity that I have not been able to resolve: With K3 tuned to 3500.0, if I double click on a spot at 3503.5 the K3 goes to 3503.5. No problem. With the K3 in the CW portion of the band (e.g. 3503.5) if I double click on a spot at 3800.0 the K3 goes to 3800.65. With the radio in the SSB portion of the band (e.g. 3800.0) if I double click on a spot at 3503.5 the K3 goes to 3502.85. I am getting a 650 Hz offset whenever the K3 changes modes. This happens in DX4WIN, but not in N1MM. Neither RIT nor XIT are on. Anyone have an idea where this is coming from? Thanks, Wayne, N1WR, K3 s/n 1945 __ 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] ERR 12V
...all of a sudden radio #1 (K3 sn 594) flashed the ERR 12v message, and CHECK CIRCUIT BREAKER etc... circuit breaker was not tripped... I've had multiple occasions of a similar situation. N1MM via MicroHam to K3to Acom amp. During the last few CW contests, occasionally in the middle of a transmission the K3 would stop transmitting and flash the ERR 12V and check circuit breaker messages. Meanwhile, N1MM is still sending data to MicroHam. I'd have to recycle the K3 power and turn the K3 power back up to 50 watts. N1MM would then not send properly, and both N1MM and MicroHam router would have to be re-booted. Eventually, it would happen again (and in more than one contest). I checked the circuit breaker, even removed and bypassed it, and removed and checked the pins on the KPA3/100. All looks OK - no sign of heat or stress. At another location, we used two different K3s in the CQ WW CW, and had similar problems with one of them, although we didn't see the ERR 12V message. It also required rebooting everything. In normal (non-contest) operation, I have had no problems. I have not ruled out RF ingress to computer, interface or K3 as the cause of the problem. K3 Support thinks it is voltage drop across the KPA3/100 pins. I didn't think to look at the PA temp, but the fans were operating normally. (I almost never notice them anyway.) I have subsequently re-arranged the interconnecting leads, and added toroids where I think they might help. I'm now waiting for the next contest to see what happens. 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
Re: [Elecraft] ERR 12V
On Tue, Jan 11, 2011 at 2:56 PM, Ralph Parker ve...@dccnet.com wrote: ...In normal (non-contest) operation, I have had no problemsI'm now waiting for the next contest to see what happens... At the moment, Murphy is vacationing in the Spratly Islands. He will be back to visit your shack right after the flag drops for the next contest. 73, Tony KT0NY __ 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] unequal power output per tone in FSK
After properly performing the TX Gain calibrations, I don't see any significant difference between tones (K3 s/n 477): Mark Space Difference at 100W100.50 100.40 -0.004 dB 80W 80.70 79.50 -0.06 dB 60W 60.90 60.00 -0.06 dB 40W 40.50 39.70 -0.08 dB 20W 20.22 19.61 -0.13 dB Measured into a known flat 50 Ohm dummy load with TelePost LP-100 watt meter. K3 is keyed in FSK, power at mark recorded and the FSK line closed and power at Space tone recorded without opening PTT. If PTT is opened and closed between reading power at Mark and Space, the two power levels are identical within the resolution of the watt meter. 73, ... Joe, W4TV On 1/10/2011 7:07 PM, Eric Swartz - WA6HHQ, Elecraft wrote: 5 pole 2.7 kHz SSB filters will also have a little more natural ripple than the 8 pole 2.8s. 73, Eric On 1/10/2011 3:35 PM, Wayne Burdick wrote: Hi Hank, The difference in amplitude is due to the small amount of ripple in the crystal filter. The effect on transmission bandwidth is negligible, and it's also extremely unlikely to affect copy. Nonetheless, we're planning to provide a way to tune out the difference. 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 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] unequal power output per tone in FSK
The effect of the skew (difference in amplitude of the mark and space tones) is to cause an undesired amplitude modulation in addition to the desired frequency modulation of the FSK. If the skew is due to a constant slope in the frequency response, then the shape of the modulation is the same for the AM and the FM. 1 dB of skew is equivalent to about 10% AM modulation. I haven't calculated the Bessel functions, but it seems clear that the sidebands from 10% AM modulation are much weaker than the sidebands of the 170-Hz deviation FSK (which is a modulation index much greater than 1 for 45-baud RTTY). A rough guess turned out to be relatively easy and the bottom line is that the far off QRM is only about 10 dB down from a phase NON-continuous case of FSK generation, if the mark and space signals are different by 1 dB. That sounds about right. If the FSK signal is unfiltered (instantaneous transitions between mark and space) then so will be the AM modulation. If you slow down the FSK transitions, then the AM transitions will slow down by the same amount. For any wave shape the AM sidebands are always much less than the FM sidebands. I don't believe 1 dB of skew would cause any significant additional QRM to nearby channels. As for affecting the received bit error rate, 1 dB of skew should be no worse than reducing power by 1 dB. Less than that if the transmitter is tuned for constant average power rather than constant peak power. Still, it would be worthwhile to eliminate the skew. I understand Wayne has that on his list. Alan N1AL On Mon, 2011-01-10 at 21:44 -0800, Kok Chen wrote: On Jan 10, 2011, at 3:35 PM, Wayne Burdick wrote: The effect on transmission bandwidth is negligible, and it's also extremely unlikely to affect copy. Hank W6SX had written to ask me for a rough guess of transmission bandwidth when there is a 1 dB difference in level between mark and space carriers. A rough guess turned out to be relatively easy and the bottom line is that the far off QRM is only about 10 dB down from a phase NON-continuous case of FSK generation, if the mark and space signals are different by 1 dB. Basically, about 10 dB down from the first plot in this web page: http://homepage.mac.com/chen/Technical/FSK/Sidebands/sidebands.html The ideal FSK phase continuous signal should look like the second plot on that page. So, forget about phase noise! Your FSK keying sidebands are going to be a much bigger problem for your nearby neighbors :-). I think that a judicious choice of tone pairs could help, but it is a band-aid, not a technical solution. 73 Chen, W7AY __ 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] ERR 12V
On 11 Jan 2011 at 15:03, Tony Estep wrote: At the moment, Murphy is vacationing in the Spratly Islands. He will be back to visit your shack right after the flag drops for the next contest. And that might be sooner than you think. Posted today from the DX0DX team, still marooned in DU land: To the DX Community at large - It's with regret that as Team Leader, I have to announce the postponement of the DXØDX Spratly Islands DXpedition 2011, due to circumstances beyond the control of the DXØDX Team. 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] help with DX4WIN
Thanks to all the responders. Unhappily I haven't yet found the problem: Here's what's been suggested: I would wager that you have your CW pitch set to 650 Hz, either in the K3 or in DX4WIN or both. I believe it is set to 650, but I can't find anything that would cause the spot offset. Try changing CONFIG CW WGHT. TAP1 to not have CW+SSB in the window. I tried this with the settings of both CW+SSB and CW-SSB but didn't fix the problem. Turn CONFIG: VFO OFS - OFF. It was OFF. What version of K3 software are you using? MCU 04.22, FPF 01.14, DSP1 02.70 ( all current). Thanks to all, Wayne N1WR On 1/11/2011 1:58 PM, Wayne Rogers wrote: I got no help from the DX4WIN reflector on this. Maybe (hopefully) someone here can help? I use DX4WIN 8.08 and a K3. I have been experiencing an oddity that I have not been able to resolve: With K3 tuned to 3500.0, if I double click on a spot at 3503.5 the K3 goes to 3503.5. No problem. With the K3 in the CW portion of the band (e.g. 3503.5) if I double click on a spot at 3800.0 the K3 goes to 3800.65. With the radio in the SSB portion of the band (e.g. 3800.0) if I double click on a spot at 3503.5 the K3 goes to 3502.85. I am getting a 650 Hz offset whenever the K3 changes modes. This happens in DX4WIN, but not in N1MM. __ 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] Yamaha CM500 in stock at Sam Ash for $45 inc shipping
after the 62nd recommendation for this headset I have finally ordered one. http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 Mark n2qt __ 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] Yamaha CM500 in stock at Sam Ash for $45 inc shipping
Thanks for the info Mark, good price and no shipping cost! I also have succumbed to the many recommendations and realized that I was hopelessly induced to buy the headphones. :) Bob K6UJ On Jan 11, 2011, at 2:44 PM, Mark n2qt wrote: after the 62nd recommendation for this headset I have finally ordered one. http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 Mark n2qt __ 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] RES: Yamaha CM500
On 1/10/2011 5:42 AM, py5eg wrote: Has someone tested for yaesu rigs? What are the results? Yes. A few months ago, I made a simple adapter to connect a CM500 to an FT1000MP for use at PJ4A. I checked it out with the MP that's still on my shelf (and for sale), and got critical on the air reports from a nearby super contester. The CM500 works just fine with the Yaesu, and sounds great. No adjustments needed for headphones. For the mic, you will need to set the mic gain VERY LOW to avoid overdriving the Yaesu's mic input. This does NOT imply anything bad about either the mic or the rig -- it's just that the mic is hot and the MP has plenty of available gain to accommodate mics that have very low output. And, as with any mic and the MP (or it's descendents), you need to carefully select the TX DSP that does the least damage to the audio. But if you DON'T turn the mic gain way down, or if you don't select the right DSP, the audio will sound just awful (like far too many SSB contesters). :) 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] Getting a buzz, the wrong way
On 1/7/2011 7:04 PM, Tony Estep wrote: If you have a wire antenna, disconnect it, put 50 ohms across the coax and hook it to your scope. If you are like me, you will see a hideous waveform of mixed harmonics of 60 hz, If you see a lot of 60Hz and its harmonics on a scope as you have described here, I would STRONGLY suspect a pin 1 problem in the scope. The most common form of a Pin 1 Problem is the mis-connection of a cable shield to internal circuitry rather than to the equipment chassis. Another common form is the connection of the power system equipment ground (the Green wire) to internal wiring, rather than to the chassis. With either (or both) of these design errors, any current flowing on either or both of those leads (the cable shield and/or the green wire) flows through the equipment, creates a voltage drop on that wiring that is added to the signal path and amplified. If it is modulated RF, it is often detected, and is a common cause of RFI. 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
Re: [Elecraft] K2 and K3 Microphone Input Impedance
On 1/6/2011 2:55 PM, George Jan wrote: It is not critical at all - should be at least 10 times the microphone impedance. Actually, the current applicable IEC Standard DEFINES the impedance of a microphone as 5X its rated load impedance. And yes, a higher input Z is better -- the rated impedance is a minimum value. Most professional mics have an impedance of 150-250 ohms, and most pro mic inputs have an input impedance of at least 1K-1.5K ohms, and there are excellent technical reasons for values of 5K ohms or greater. 73, Jim Brown K9YC Member, AES Standards Committee and WG on Microphones __ 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] OT: Flat ferrite clamp-ons for window line
Guy, Look at Fair-Rite 2643167851 This MIGHT allow several turns of some smaller window line, maybe enough to be useful at HF. Remember that you need a complete magnetic circuit, so this makes it unlikely that ferrite parts designed for ribbon cable will fit your need. I assume you're attempting a common mode choke. Take a look at the latest version of my RFI tutorial, which shows some very nice medium power HF common mode chokes having a Z of about 100 ohms wound on #31 toroids with #14 THHN. You could raise the impedance by spreading the bifilar pair a bit. Unlikely you'll achieve a perfect match, but we both know that's probably not a deal killer for a section of line that's less than 1/30 wavelength at the operating frequency. :) http://audiosystemsgroup.com/RFI-Ham.pdf 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] Yamaha CM500 in stock at Sam Ash for $45 inc shipping
Coincidently I ordered my second pair this morning at that same site,they charged me $47 shiped to Florida.They said also they have a strore in Tampa here so I should have them in two days. AD4C If freedom means something,it is the right to tell others what they don't want to hear –George Orwell --- On Tue, 1/11/11, Mark n2qt n...@verizon.net wrote: From: Mark n2qt n...@verizon.net Subject: [Elecraft] Yamaha CM500 in stock at Sam Ash for $45 inc shipping To: Elecraft@mailman.qth.net elecraft@mailman.qth.net Date: Tuesday, January 11, 2011, 10:44 PM after the 62nd recommendation for this headset I have finally ordered one. http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 Mark n2qt __ 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] Yamaha CM500 in stock at Sam Ash for $45 inc shipping
no shipping cost Not exactly truth,they told me there is no free shiping for the state of FL although it was just few bucks. AD4C If freedom means something,it is the right to tell others what they don't want to hear –George Orwell --- On Tue, 1/11/11, Robert Harmon k...@pacbell.net wrote: From: Robert Harmon k...@pacbell.net Subject: Re: [Elecraft] Yamaha CM500 in stock at Sam Ash for $45 inc shipping To: Mark n2qt n...@arrl.net Cc: Elecraft@mailman.qth.net elecraft@mailman.qth.net Date: Tuesday, January 11, 2011, 11:10 PM Thanks for the info Mark, good price and no shipping cost! I also have succumbed to the many recommendations and realized that I was hopelessly induced to buy the headphones. :) Bob K6UJ On Jan 11, 2011, at 2:44 PM, Mark n2qt wrote: after the 62nd recommendation for this headset I have finally ordered one. http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 Mark n2qt __ 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] help with DX4WIN
Problem solved - thanks to Dave, N4QS. Under CONFIG CW WGHT - tapping 5 toggles between VFO offset on SSB/CW mode change (VFO OFS) or no offset (VFO NOR, default). After Dave pointed this out I went to the pdf version of the manual and sure enough - it included this option. I guess I need to toss the old (outdated) hard copy manual I got with the radio! 73, Wayne Wayne Rogers wrote: Thanks to all the responders. Unhappily I haven't yet found the problem: Here's what's been suggested: I would wager that you have your CW pitch set to 650 Hz, either in the K3 or in DX4WIN or both. I believe it is set to 650, but I can't find anything that would cause the spot offset. Try changing CONFIG CW WGHT. TAP1 to not have CW+SSB in the window. I tried this with the settings of both CW+SSB and CW-SSB but didn't fix the problem. Turn CONFIG: VFO OFS - OFF. It was OFF. What version of K3 software are you using? MCU 04.22, FPF 01.14, DSP1 02.70 ( all current). Thanks to all, Wayne N1WR __ 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] help with DX4WIN
Wayne, I would not trash that hard copy manual - it contains information about the connections to the K3 and the various buttons and knobs that are still valid. The biggest changes are in the menu system, so I would advise to download the latest .pdf version of the manual and print the section dealing with the menu items. then insert it in your manual as an update. - AND pay attention to the Firmware Release Notes (print them if you want, but K3 Utility Help is a convenient resource for that information). That information should keep you up-to-date with the latest major changes to the K3 - it is mostly in the firmware. 73, Don W3FPR On 1/11/2011 8:10 PM, Wayne Rogers wrote: Problem solved - thanks to Dave, N4QS. Under CONFIG CW WGHT - tapping 5 toggles between VFO offset on SSB/CW mode change (VFO OFS) or no offset (VFO NOR, default). After Dave pointed this out I went to the pdf version of the manual and sure enough - it included this option. I guess I need to toss the old (outdated) hard copy manual I got with the radio! 73, Wayne __ 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] No PTT
For no particular reason (that I know of) my K3 serial #849 suddenly has no ptt function. I have gone into the menu and cannot re-engage the PTT. I get an error message of err tfx. The rig will tune in cw, but no PTT. What am I doing wrong? I'm sure it is painfully obvious. K0GFY R. Hunter Ellington 303-454-0543/720-560-8139 P.O. Box 44 Larkspur, CO 80118 __ 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 For Sale
My financial circumstance requires that I reluctantly need to sell my K3 and related equipment. My K3 (100W) includes the KAT3 (auto tuner) and the KXV3 (Transverter interface). I also have the W2-A Wattmeter (SWR Bridge) with the 1.8-54 MHz 200 Watt coupler -- all factory assembled. Included are both the K3 handheld microphone as well as a Heil Proset-K2 boomset headset with mic and the Heil dual floor switch. I am a non-smoker and would prefer to sell all the equipment at the same time but I will consider selling individual pieces. The cost for everything mentioned is $3,040.00. If interested please contact me off list with K3 in the subject line so I can tell it isn't spam. Jim MacKenzie, WH7RG __ 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] No PTT
Hunter, The ERR TXF is significant. If you check the manual, you will find that message is telling you that you do not have the correct transmit filter selected. The easy way is to use K3Utility. The Transmit filter for CW, Data modes and SSB must be the 2.7 (2.8) kHz filter. 73, Don W3FPR On 1/11/2011 11:25 PM, Hunter Ellington wrote: For no particular reason (that I know of) my K3 serial #849 suddenly has no ptt function. I have gone into the menu and cannot re-engage the PTT. I get an error message of err tfx. The rig will tune in cw, but no PTT. What am I doing wrong? I'm sure it is painfully obvious. K0GFY R. Hunter Ellington 303-454-0543/720-560-8139 P.O. Box 44 Larkspur, CO 80118 __ 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] unequal power output per tone in FSK
I decided that rather than depend on a hand-waving argument I would go ahead and do a Mathcad simulation to calculate the effect of 1 dB of tone skew (unequal mark and space tone amplitudes) on the transmitted FSK spectrum. Basically, I found that it made no significant difference. A PDF of the Mathcad file is at: ftp://ftp.elecraft.com/tmp/FSK_tone_skew.pdf The equations are on the first page and the spectrum graphs are on the second. (On my browser I have to copy the part of the above URL after the ftp://; part and paste it into the browser window to get FTP to work.) Alan N1AL On Tue, 2011-01-11 at 13:10 -0800, Alan Bloom wrote: The effect of the skew (difference in amplitude of the mark and space tones) is to cause an undesired amplitude modulation in addition to the desired frequency modulation of the FSK. If the skew is due to a constant slope in the frequency response, then the shape of the modulation is the same for the AM and the FM. 1 dB of skew is equivalent to about 10% AM modulation. I haven't calculated the Bessel functions, but it seems clear that the sidebands from 10% AM modulation are much weaker than the sidebands of the 170-Hz deviation FSK (which is a modulation index much greater than 1 for 45-baud RTTY). A rough guess turned out to be relatively easy and the bottom line is that the far off QRM is only about 10 dB down from a phase NON-continuous case of FSK generation, if the mark and space signals are different by 1 dB. That sounds about right. If the FSK signal is unfiltered (instantaneous transitions between mark and space) then so will be the AM modulation. If you slow down the FSK transitions, then the AM transitions will slow down by the same amount. For any wave shape the AM sidebands are always much less than the FM sidebands. I don't believe 1 dB of skew would cause any significant additional QRM to nearby channels. As for affecting the received bit error rate, 1 dB of skew should be no worse than reducing power by 1 dB. Less than that if the transmitter is tuned for constant average power rather than constant peak power. Still, it would be worthwhile to eliminate the skew. I understand Wayne has that on his list. Alan N1AL On Mon, 2011-01-10 at 21:44 -0800, Kok Chen wrote: On Jan 10, 2011, at 3:35 PM, Wayne Burdick wrote: The effect on transmission bandwidth is negligible, and it's also extremely unlikely to affect copy. Hank W6SX had written to ask me for a rough guess of transmission bandwidth when there is a 1 dB difference in level between mark and space carriers. A rough guess turned out to be relatively easy and the bottom line is that the far off QRM is only about 10 dB down from a phase NON-continuous case of FSK generation, if the mark and space signals are different by 1 dB. Basically, about 10 dB down from the first plot in this web page: http://homepage.mac.com/chen/Technical/FSK/Sidebands/sidebands.html The ideal FSK phase continuous signal should look like the second plot on that page. So, forget about phase noise! Your FSK keying sidebands are going to be a much bigger problem for your nearby neighbors :-). I think that a judicious choice of tone pairs could help, but it is a band-aid, not a technical solution. 73 Chen, W7AY __ 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
