Re: [Elecraft] [K2] Output power not matching power setting and very unstable between transmissions
Yes, when HiCur is detected, the power will be reduced to the level permitted by the value in the CAL CUR setting = and that value will be stable. If HiCur happens on 40 meters (but not 60 meters), and 20 meters (but not 30 meters), 15 meters (but not 17 meters), and 10 meters (but not on 12 meters), check for an extra turn on the Low Pass Filter toroids. 73, Don W3FPR On 10/6/2014 1:44 AM, KY7K wrote: Don, Thank you for your recommendations. D9 is a 1N5711 and checks OK. A full reset made no difference. Setting CAL CUR to 3.5 reduces the frequency of the HI-CUR messages, however with the power control maxed it will still show up sometimes. Note that when the HI-CUR occurs it is only for a second, after which the power drops down to some random stable level. Base of Q7 and Q8 are between .60 and .64 volts While adjusting the power control with the radio in receive the power shown on the display changes very smoothly as it should. However, if the power control is adjusted while transmitting the power shown on the LCD display and the LED bar graph jumps all over the place. The bar graph does show that the power is increasing and decreasing overall as it should, what I mean by that is the bar graph shows 4-5 bars of “noise” while adjusting the power in transmit, but the overall direction of the “noise” goes up or down in the correct direction if you were to average the “noise”. Another test I made, however I’m not sure it is valid, was to control VPWR manually by lifting R22 where is meets C45 and inserting a control voltage on the lifted end of R22. In this mode the power is stable and varies smoothly as the external control voltage is varied. The power output is also stable from tune cycle to tune cycle in this test. I question the validity of this test because VPWR and VALC are already setup and stable prior to transmitting, unlike they normally would. Steve - KY7K k...@arrl.net Get OUT and play radio! On Oct 5, 2014, at 6:35 AM, Don Wilhelm w3...@embarqmail.com wrote: Steve, If hooked up backwards means that the DC power was connected with reverse polarity, that will normally cause no harm to the K2 because there is a series reverse voltage protection diode in the input power line. The burned trace on the mic jack pin 5 suggests that something different happened to it. Try replacing D9 with a 1N5711 diode and see what happens. The power output into a good dummy load will normally be within 0.2 watts of the set power if all is working right. You older K2 has a 1N34 diode at D9 and it is not as accurate over the full frequency range as the 1N5711. If you have not done so already, record the menu settings, especially the filter settings and do a Master Reset (hold the 4, 5, and 6 buttons in while powering the K2 on). Then run CAL PLL and restore the menu settings. The fact that the problem goes away if you swap control boards suggests that there may be some problem with the EEPROM contents, and a Master Reset should 'clean it out'. Set CAL CUR to 3.50 instead of 2.50 and see if the HiCur messages go away. If they continue, you may have to replace the PA transistors. Another thing to check is the DC voltage at the base of Q7 and Q8 during a TUNE - it should be in the range of 0.60 to 0.64 volts. If not, replace Q11 and Q13. 73, Don W3FPR On 10/5/2014 1:36 AM, KY7K wrote: I forgot to mention that all testing is into a known good DL1 dummy load that I’m also using for my external power readings. Any wise insights are most welcome! Steve - KY7K k...@arrl.net Get OUT and play radio! __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Strange Ticking sound with K3/0 Mini to RemoteRigfor remotely controlling K3.
Exactly. This is computer polling. Put as much ferrite on the USB (serial port) cable as you can. 73, Igor UA9CDC - Original Message - From: K4ia via Elecraft elecraft@mailman.qth.net To: bwru...@gmail.com Cc: Elecraft Reflector elecraft@mailman.qth.net Sent: Monday, October 06, 2014 4:19 AM Subject: Re: [Elecraft] Strange Ticking sound with K3/0 Mini to RemoteRigfor remotely controlling K3. USB or serial port polling? Try a different adapter or one that uses an optoisolater Craig Buck On Oct 5, 2014, at 5:36 PM, Brian F. Wruble bwru...@gmail.com wrote: Hi All: The symptom I am describing persists despite changing routers, internet systems, and cities. In a QSO this morning, the other parties reported a ticking sound on my transmitted signal --- faint but noticeable --- and I could also hear it in XMIT Monitor. I was operating my remote gear as a test --- in the same room as the K3, and on the same LAN. I have now set myself up 110 miles away, and the sound persists. I am able to work others, get good signal reports, but I can hear the tick tick tick, about 2 per second. In testing, I find the sound is there even if I power down the gear --- the radio and the control end. It persists if I remove 12VDC from the K3/0 mini. Also if I remove the wifi module from the RemoteRig control box. If I remove power from the RemoteRig, it goes away. With power to the RR, the ticking goes away if I unplug the TTL line from the K3/0 mini. Unplugging the other lines makes no difference, though it becomes fainter if I unplug Aux/Mic. It persists if I remove the ethernet cable connecting the RemoteRig to my router. It persists if I unplug the USB line from the RemoteRig to my PC. This symptom appeared after a good period of time when everything worked. And all functionality is still there --- just this maddening tick tick tick --- like something from Edgar Allan Poe. All ideas gratefully accepted. 73 de Brian W3BW *Brian F. Wruble, C.F.A. __ 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 Message delivered to k...@aol.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 Message delivered to ua9...@gmail.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 Message delivered to arch...@mail-archive.com
[Elecraft] HI RFI HI CUR above 12 Watts on K3 Screen, RX shuts down for a minute .
Problem originated on 6M(affects all bands) when ATU was being used to Tweak SWR from 2.4 to 1.0:1. ATU constantly moved up and down tuning, never resting on 1.0:1Power output was intermittent(100W) would go to zero then back to 100 as ATU was looking for match. Then, HI SWR, RFI scrolls across screen as no power is coming out of K3. Affects Ant 1 and Ant 2 SO239s on back of chassis. Affects with RX antenna unplugged. Any Band, any Mode. Either VFO A or B. Finally, HI SWR, HI Cur, RFI scrolls across screen after power goes above 12W.(Never shows ANY power on the LED screen, only one Bar each time I transmit. Uploaded new Firmware and reset K3. On all bands...with or without ATU(eventually uninstalled it) on any antenna or on Dummy Load, Rig shows Zero Power output as I go from 0-12.5 W then at any power over 12 Watts, the RX makes a variable warbling noise and normal receive is bypassed. After a few seconds, the RX may come back on. I just installed a K9AY RX system not too far from XMIT ant. But have been using it all bands no problem for 2 months. ATU always has difficulties matching low SWR on 160 and 6M. Any suggestions as to what is gong on?Anyone experience this before? 73ValN4RJ Fast, Secure, NetZero 4G Mobile Broadband. Try it. http://www.netzero.net/?refcd=NZINTISP0512T4GOUT2 __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] FS K3/10
For sale K3/10 serial 16xx. $1550 plus shipping. Smoke free environment. I purchased this rig new and it has seen minimal usage. myc...@arrl.net Frankie K4TEN Has the following options: K3/10 K3 10W Xcvr. (Assembled) $1799.95 KBPF3 K3 Gen. Cov. RX Module $169.95 KFL3A-2.8_2.7sw 2.8 for 2.7 kHz swap $129.95 KFL3A-6K K3 6 kHz, 8 pole filter $139.95 KXV3A K3 RX Ant, IF Out Xvrtr Intf. $129.95 $2369.75 __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] KX3 Mic/Phone Adapter Question
I've got a KX3 that so far has only been used on CW or data, and have been using fairly bulky Sony headphones with it. Those phones work fine, but aren't exactly something I want to use in a portable / car camping environment. Yesterday while at Fry's electronics I saw a lightweight headset with attached mic that looked like a junior version of the Yamaha CM500 that I use with my K3. It has a single, 4-connector TRRS plug. Does anyone know of a supplier of an adapter that breaks out the mic and audio into two separate cables/plugs like the CM500 has? Or. is there a lightweight junior version of the CM500 on the market - one that has two separate cables: mic and phones? Thanks, Jim / W6JHB __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] KPA500 band change problem
Hi I run a Kenwood TS-2000, KAT 500 Tuner and KPA 500 amp. In the last few months I have been having an intermittent issue with my amp. On some occasions when I have changed bands it will not follow the band changes like the ATU does. So if I am on say 14MHz and change to 7Mhz the ATU changes antenna/band but the amp remains on 14Mhz. Changing it manually, changes the display on the amp to 7Mhz but the amp will not operate on that band (or any other I subsequently change to). Reinstalling the firmware (1.38) seems to fix the problem but every now and then the same thing happens again without warning (although normally when I am looking to work something I need the amp for quickly). Has anyone else struck this and if so did you find a solution? 73 Mark ZL3AB __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K2] How much AF volts at 1kHz to get full RF power using KSB2?
I’m rapidly getting nowhere with this problem. I need to understand how the overall circuit works and what I should expect to see on the ‘scope. My understanding is that RF Power is basically under the control of a feedback loop controlled by the VRFDET circuit on the RF board. The front panel PWR OUT is simply an input to Control Board U8, which generates V PWR via U8. V PWR sets the target level in the ALC block and affects V ALC. V ALC goes to Q24 and controls the o/p level of the BFO, which then flows through filters etc to the PA, where VREFDET is generated. In CW mode, that’s all there is, and it works. Varying PWR OUT varies the RF power generated. The problem comes in SSB mode. With the KSB2 installed, and in CW mode, the BFO signal goes in and out of the KSB2 via Q3. All OK. In SSB mode, the KSB2 has an additional ALC circuit block that uses VRFDET, ALC THR and PWR CTRL to throttle the SSB generated on the KSB2 which then goes back out via Q2. This doesn’t work. In SSB mode, the AF mixes in the balanced modulator but changing PWR OUT has no effect. If my understanding is correct, the problem would seem to lie in one of two places: a) the ALC circuit block on the KSB2 or b) the AF compressor circuit. I want to remove the Mic as a source of variability but I don’t know what AF voltage should cause 100% of the set o/p power. 73 Gareth - M5KVK On 1 October 2014 22:10, Gareth - M5KVK m5...@m5kvk.org wrote: Thanks for the help Don.I really appreciate it. Apart from finding that R7 was not fitted (how many times had I looked at the board?), I can see nothing untoward. Fitting it made no difference. I note that these were the ones changed in the Rev E errata. Relevant? Mine is a Rev D board and (e.g.) R9 is 10k rather than 3.9k as per the Rev D manual. The receive audio is slightly down with OP1 but not a lot. Diodes are all the right way around and T2 appears to be OK, no shorts and buzzes through OK. I did see a suspicious poor solder joint with R69 on the RF board, but again it made no difference. On 1 October 2014 18:16, Don Wilhelm d...@w3fpr.com wrote: Gareth, The PWR CTRL on the KSB2 does not do much at all, so what you are seeing is about right. The power control is done from the VRFDET feeding the base of Q1. It causes Q1 to conduct and alters the voltage to the base of Q2. The SSB signal is 'throttled' after the signal is generated and passed through the OP1 filter. The BFO injection should not change for SSB operation like it does for CW mode. Check resistors R4 and R9 for proper values and good soldering. Check the orientation of D2. If you are still not getting adequate signal at D4, then you may have a problem with T2 or a solder bridge on one of the capacitors in the filter area that is dragging the signal down. How does the OP1 filter behave in receive. If the RX signal is attenuated more than with the variable filter, that problem may be related to your TX problem. The VRFDET signal level is a level determined by the actual power output of the K2 - it comes from the wattmeter forward power detection in either the KAT2 or the KPA100 - without either of those options, it comes from the RF Detector D9 on the RF Board. 73, Don W3FPR On 10/1/2014 11:17 AM, Gareth - M5KVK wrote: Don, Yes, D4 seems to be OK I've done some further probing and I'm wondering if the problem lies in the ALC circuit. Basically, the power doesn't vary as I change the POWER control. Scoping U2. There is data on pin 8, but only the second nibble changes. ALC THR goes up as I change POWER, but PWR CTRL stays stuck at about 5.6V regardless of where POWER is set or what AF there is. What is the purpose of PWR CTRL? Should it be changing? Gareth - M5KVK On 29 September 2014 21:45, Don Wilhelm w3...@embarqmail.com wrote: Gareth, Is D4 mounted with the correct orientation. - the line on the silkscreen points to the cathode end. 73, Don W3FPR On 9/29/2014 4:16 PM, Gareth - M5KVK wrote: Thanks, Don I'm getting more or less the same as you except for the RF out on U5 pin 4. I'm seeing the BFO of about 400mV pp with no AF, and then going up to 800mV pp when I whistle into the Mic. Doh! I thought I had the carrier balance right, but obviously not. Switching on the SSBA=BAL shows a bif signal on U5 pin 4. I've adjusted that down to almost zero on the 'scope, but I'm still not getting much RF out. 73, __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] Elecraft SSB net results for 10/05/2014
Here is the net report for the Elecraft SSB net from October 5, 2014. Peter, ZL1PWD, checked in for the first time in quite awhile. We had 29 participants. Station NameQTH Rig S/N K4GCJ Gerry NC K3 1597 WB9JNZ EricIL K3 4017 K7BRR BillAZ K3 5545 WV5IDwayne TX K3 5287 W2RWA DickNY K3 2603 KC9LIF KentIL K2 6896 QRP WO1IDickMA K3 911 W8OVDaveTX K3 3139 KF5IMA Bruce MS K2 3575 K5LAD Jim OK K3 1068 W6NIA/m MattNM KX3 6 W4RKS Jim TX K3 3618 W0CZKen ND K3 457 W4DML DougTN KX3 2915QRP WW4JF JohnTN KX3 159 W7QHD KurtAZ K2 1538 KE7HGE Ken WA KX3 4540 QRP AB7CE Roy MT KX3 115 QRP ZL1PWD Peter NZ K3 139 KD0HII Brian IA K3 3672 KF5YBE/mLee TX TS480HX K4STN BillGA KX3 4330 N4WCQ RickKY K3 8160 WN8AJim MI K3 3480 N6JWJohnCA K3 936 KB0MM BurtMN Yaesu QRP NC3ZGaryMD KX3 6721 KD0MOA JohnCO KX3 3560 QRP NS7PPhilOR K3 1826 73, Phil, NS7P __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K2] How much AF volts at 1kHz to get full RF power using KSB2?
Gareth, You should find between 200 and 400 mV peak to peak (dependent on the particular speech patterns) from an electret microphone such as the Elecraft MH2. That is 70 to 140 mV RMS. That is sufficient to drive the SSB output to pull power. 73, Don W3FPR On 10/6/2014 3:57 PM, Gareth - M5KVK wrote: I want to remove the Mic as a source of variability but I don’t know what AF voltage should cause 100% of the set o/p power. __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Split N/A
Don't know if bad drivers is the right term, possibly new drivers might be better. I agree however that trying to fool proof can lead to all sorts of problems. Although I thought [in the early 80's] that this cellular telephone business wouldn't catch on [heavy phone-in-a-bag] ... I am now on my 9th phone, this one a Verizon Samsung Galaxy 5 [I also told my wife that ATM's would be a loser for banks :-)]. The Galaxy 5 attempts to think for me in many places [spell check and auto-complete are only two small examples], and, with 29 yr old grandson's help, I'm slowly turning off the ones that I can. I'm totally capable to learn how to do something with it on my own. Likewise with my KX1, K2, K3, KPA500, KAT500, and P3. I'm not surprised how picky many have become, the technology we take for granted today is light-years beyond what we used in the 50's and we're used to pushing popcorn to nuke a bag to perfection [if it's correct side down]. I *am* glad however that Elecraft monitors this list [and likely others], and is very careful about implementing a suggestion from what could be a customer-base of one. 73, Fred K6DGW - Northern California Contest Club - CU in the 2015 Cal QSO Party 3-4 Oct 2015 - www.cqp.org On 10/3/2014 5:06 AM, david Moes wrote: Im not sure I would like this at all. sometimes I think that fool-proofing a rig is the wrong way to go as it take the ownership away from the operator to pay attention to what they are doing and panders to the shall I say the bad drivers. __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Split N/A
The problem isn't drivers or anything like that, it is attempting to deal with application software that does not handle the K3's unique interface. For example, WSJTX 1.4 when controlling *any rig* via DXLab Suite's CI-V Commander sets the frequency (VFO A), turns on split, then sets the transmit frequency (VFO B). In monitoring TCP commands between the two applications, I don't even see an attempt to set the mode of VFO A, much less VFO B - but that's moot because the software turns on Split before even setting transmit frequency. If the K3 were to force VFO B to the same frequency and mode as VFO A when split were enabled (if VFO A is in DATA or on a different band than VFO B) software like WSJT-X that apparently caters to the lowest common denominator in rig control interfaces would not be able to send the K3 off into the weeds. Remember, software like this generally does not have user programmable band change/frequency set macros - it is not a matter of user responsibility. This is more a matter of surviving software with limited sophistication when it comes to rig control. 73, ... Joe, W4TV On 2014-10-06 7:58 PM, Fred Jensen wrote: Don't know if bad drivers is the right term, possibly new drivers might be better. I agree however that trying to fool proof can lead to all sorts of problems. Although I thought [in the early 80's] that this cellular telephone business wouldn't catch on [heavy phone-in-a-bag] ... I am now on my 9th phone, this one a Verizon Samsung Galaxy 5 [I also told my wife that ATM's would be a loser for banks :-)]. The Galaxy 5 attempts to think for me in many places [spell check and auto-complete are only two small examples], and, with 29 yr old grandson's help, I'm slowly turning off the ones that I can. I'm totally capable to learn how to do something with it on my own. Likewise with my KX1, K2, K3, KPA500, KAT500, and P3. I'm not surprised how picky many have become, the technology we take for granted today is light-years beyond what we used in the 50's and we're used to pushing popcorn to nuke a bag to perfection [if it's correct side down]. I *am* glad however that Elecraft monitors this list [and likely others], and is very careful about implementing a suggestion from what could be a customer-base of one. 73, Fred K6DGW - Northern California Contest Club - CU in the 2015 Cal QSO Party 3-4 Oct 2015 - www.cqp.org On 10/3/2014 5:06 AM, david Moes wrote: Im not sure I would like this at all. sometimes I think that fool-proofing a rig is the wrong way to go as it take the ownership away from the operator to pay attention to what they are doing and panders to the shall I say the bad drivers. __ 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 Message delivered to li...@subich.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 Message delivered to arch...@mail-archive.com
[Elecraft] Looking for a K3
Anyone have a K3 for sale, if so please send details to include serial number, options, etc. also best price shipped to zip 45324. Can pay by PayPal. Thanks Tim NZ8J __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Looking for a K3
Again? Really? Tim must have the record for the most number of K3s bought and then sold, over the last several years. __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] FS: KAT100/KPA100 in EC-2 enclosure
Get 100 watts out of your K2! In excellent condition with cables and manual, KAT100 amplified, KPA100 antenna tuner installed in separate enclosure and built by me in December 2009 and used up until a few months ago. With this amplified/antenna tuner, it is a simple matter to run the K2 at QRP and 100 watt levels. Selling because, it is surplus to my needs since I have a second K3. As a kit, Elecraft sells this for $729.85 plus shipping. I am asking $500.00 plus shipping. I also have an MFJ259B antenna analyzer for sale, $160.00 Phil, W3HZZ __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K2] How much AF volts at 1kHz to get full RF power using KSB2?
On Mon,10/6/2014 1:56 PM, Don Wilhelm wrote: You should find between 200 and 400 mV peak to peak (dependent on the particular speech patterns) from an electret microphone such as the Elecraft MH2. That is 70 to 140 mV RMS. That is sufficient to drive the SSB output to pull power. I once owned a pair of K2/100s and used them for contesting. I found the audio chain rather gain-starved and with excessive low-frequency bandwidth, so I changed a few resistor and capacitor values to increase the gain and reduce the LF. I think I managed about 6 dB. I believe that I passed those mods along to you, Don. The changes allowed me to hit the Limiter a bit harder, increasing its compression ratio. 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 Message delivered to arch...@mail-archive.com
[Elecraft] New KX3 field-test firmware -- improvements for PX3; misc.
This is a bug-cleanup release, rev. 2.25, that will appeal to specific KX3 users. Changes are listed below. This release also supports text display on the PX3 (requires PX3 rev. 1.12), and DUAL RX (dual watch) even with RX SHFT=8.0. Both have been extensively tested at this point. If you're interested in trying the new field-test release right away, please email me (directly, rather than via a list reply). I'll get it out to you tomorrow. By the way: Thanks, everyone, for the ongoing help with new releases. We're trying wrap up KX3 work so we can spend some time on the K3's firmware task list. Thanks, Wayne N6KR * * * MCU 2.25 / DSP 1.30, 10-5-2014 * PX3 NOW DISPLAYS VFO B PASSBAND CORRECTLY: The PX3 was showing the wrong VFO B filter bandwidth or passband location when using DATA modes or DUAL RX (dual watch). * DUAL RX DOES NOT FORCE OFS/B KNOB TO BE USED AS VFO B: The operator’s OFS/B knob assignment is no longer lost when DUAL RX is in effect. * FAST-PLAY DISPLAY ERROR FIXED: With fast-play enabled (1-touch message play using BAND+/- and FREQ ENT.), a band change originating from a PC application no longer flashes “END” on VFO B. * CW SPEED DISPLAY TIME INCREASED WHEN TEXT DECODE IS ON: In CW mode, speed is now displayed for 1.0 sec. In FSK-D and PSK-D modes, it's .5 sec. The time is shorter for DATA modes because character transmission rates are usually faster, and the operator might miss important text due to the speed display. * PA BYPASS METERING FIXED: If the KXPA100 goes to bypass because of an error condition, the KX3 drops to 5 W. The RF meter is now correctly set to low range. * TEXT DECODE LOCKOUT FIX: Adjustment of NR, NB, NTCH, etc. no longer causes loss of CW/DATA text decode on the VFO B display. * HOST COMMANDS “UP”, “DN”, and “DT” are now working with the PX3. * * * Other recent releases: MCU 2.24 / DSP 1.30, 10-1-2014 * SUPPORT FOR PX3 TEXT DISPLAY: To enable text decode on the PX3, hold LABELS switch to switch to text-decode mode (requires PX3 rev. 1.12 or later). Text decode must also be enabled at the KX3. MCU 2.23 / DSP 1.30, 9-24-2014 * DUAL RX NOW ALLOWED WITH RX SHFT=8.0. In this case, VFO A can be from -7 below VFO B to +23 above it (vs. +/- 15 for RX SHFT=NOR). __ 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 Message delivered to arch...@mail-archive.com
