Re: [Elecraft] [K3] Real Time Clock Battery replacement
It all depends on the RTC current. A nice graph of expected life vs current (uA) for a number of CR cells is in http://www.varta-microbattery.com/applications/mb_data/documents/sales_literature_varta/HANDBOOK_Primary_Lithium_Cells_en.pdf I had my K3 for 3 yrs when I upgraded the synth cards and I did replace the CR2032 on general principle. Cheers Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Real-Time-Clock-Battery-replacement-tp7605040p7605053.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] QRP signals from Pathfinder probe (off topic)
Here is details on spacecraft design and on the RF comms subsystem. Interesting reading http://www.boulder.swri.edu/pkb/ssr/ssr-fountain.pdf The New Horizons Spacecraft - Johns Hopkins Applied Physics Laboratory http://www.boulder.swri.edu/~tcase/NH%20RF%20Telecom%20Sys%20ID1369%20FINAL_Deboy.pdf The RF Telecommunications System for the New Horizons Mission to Pluto - Johns Hopkins Applied Physics Laboratory 73 Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/QRP-signals-from-Pathfinder-probe-off-topic-tp7604967p7604995.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Joe A 2.8 KHz filter is not appropriate for for AM So true If you want to operate diversity in AM you will need one of the wider filters. I don't and don't recall mentioning I did want to. I do recall stating I found this behavior accidentally. I really wasn't expecting such a debate about what others think I must not understand. Cheers Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604891.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Waiting for Wayne to comment sounds like a stellar idea! So say we all? Cheers Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604892.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Guy Please note my response before your posting. It is not that I want diversity beyond 2.8 kHz, I just accidentally did and the current side effect of shifting the RX B passband caught be by surprise as I don't recall this experience prior to updating the Synth boards. I get that diversity means identical paths but I do wonder if the freq shift might be compensated for even when different filters are used for no other reason than that's all that's available to the K3. Yes that would mean diversity is degraded until one reduces BW down to where the filters are identical. I suggest that might be better than hearing everything in your right ear shift suddenly. It's not a demand. It's only a thought as I thought it worked that way before I upgraded the Synths. Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604882.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Wayne Something tells me I may be your signature edge case for this particular situation. I would be happy to be an early tester. Cheers Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604897.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Here is what I posted on the Yahoo group just now. I hope a little time helped clarify my description post starts now ... I can better explain and reproduce the issue now. Thanks to Dale WA8SRA, Don W3FPR , and Wayne N6KR for hints along the way I have the following 8-pole filters Main: 1=15k, 2=6k, 3=2.8k, 4=2.1k, 5=0.4k Sub: 1=0.0, 2=0.0, 3=2.8k, 4=2.1k, 5=0.4k I am tuned to 10.000 MHz USB in diversity mode with Lo = 0.00 and Hi = 3.0 I observe RX A XFIL = FL2 (6 kHz) and using BSET I see that RX B XFIL = FL3 (2.8 kHz) At this time RX A passband starts at 10.000 MHz but RX B passband is shifted -1.5 kHz to start at 9.9985 MHz Now I decrease Hi to 2.8 kHz. The instant I do this, RX A XFIL shifts from FL2 (6 kHz) to FL3 (2.8 kHz) and RX A and RX B passband are both aligned properly to start at 10.000 MHz I can work around this. Cheers Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604860.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
I sure hope not! Actually that raises a good question. Wayne, is this effect something you consider a bug? I can tell you having the sub rx shift seemingly on it's own just because I was changing the passband was interesting to experience. Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604863.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Joe It's not that I want to use diversity beyond the filters I had in the sub rx, I just accidentally discovered this effect I am looking over Wayne's early comment about how their might be an issue handling 8-pole vs 5-pole shifts. Could not the technique used for that situation be applied when the K3 knows the filter widths are different? Note I fully grasp diversity is degraded when the filters differ; I am just wondering if the frequency shift effect can be compensated for even when diversity is degraded. Cheers Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604871.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 Message delivered to arch...@mail-archive.com
[Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Hi all I have a very odd thing happening in diversity mode after installing the new VFO's. I have a K3 with dual receivers and new VFOs using a dipole and loop antenna when in diversity. I also have a P3. I am on current 5.29 firmware and have successfully gone through all required calibration steps after upgrading the VFO. Scenario follows ... I am listening to WWV 10 MHz in USB mode. When I am in Split, not Diversity, WWV zero beats at exactly 10.000 MHz. The P3 green band denoting the K3's passband is nicely lined up with the upper sideband of WWV. When I am in Diversity mode, however, WWV zero beats at exactly 9.9985 MHz. On the P3 I clearly see the WWV signal at 10.000 MHz while the green band denoting the K3's frequency is just as clearly 1.5 kHz lower. I can't figure out what is causing this -1.5 kHz shift! I have had my K3 for some time so I feel I am reasonably competent with it :) but this has me stumped. I have asked K3 Support about this but I thought someone out there might have seen and dealt this this already. 73 Rick AG6AY K3 5706 P3 1835 -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Everyone - much thanks for the input. I will try for a compiled response since I had so many responses! what exactly are you zero beating? The WWV carrier ... well ok I'm not exactly zero beating in the proper sense. By tuning the K3 through the 10.000 MHz WWV AM station using SSB mode with Lo = 0.00, I can quickly confirm the extremely low frequency audio is indeed the carrier and that it 'goes through zero Hz at 10.000 MHz. Again, this is not a proper zero beat but it's close enough for Gov't work :) What happens if you are not in either Split or Diversity WWV 10 MHz carrier 'zero beatsz at exactly 10.000 MHz If you are using LO/HI CUT ... and other comments about band pass ... Yep, understood. Lo = 0.00 and Hi = 2.80 when I observed this. Normally when you listen to an SSB station ... Yep, understand. See my test description. If you have a combination of 5- and 8-pole filters in the main and/or sub receivers I used 8-pole filters exclusively. I -did- buy them about a year or two apart, however, that should not matter. What filters do you have installed? Main: 1=15k, 2=6k, 3=2.8k, 4=2.1k, 5=0.4k Sub: 1=0.0, 2=0.0, 3=2.8k, 4=2.1k, 5=0.4k Freq Offset = 0.00 for all Gain = 0.00 for all except Filter 5 which is set to 2 db on Main and Sub Pay close attention to the filter bandwidth you have dialed in, and make sure that BOTH the main receiver and sub-receiver are using filters of the SAME bandwidth OK, I took a good hard look at the XFIL value as I went in and out of Diversity ... Tuning to 10. again. Lo = 0.00 and Hi = 2.80 Main Rx uses FL3 (2.8 kHz). Diversity uses FL3 also. *Now wait a darned minute* ... the 1.5 kHz shift 'went away'. I don't know how. I did fix some 20M DIGOUT settings I had whacked over Field Day but that surely can't affect this. Wayne I can no longer replicate this and I have not a clue how it fixed itself. I'm game to try more tests but heck I'm going to use this on IARU while I can! Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604853.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Dale Hmm. I very well could have set Hi = 3.0 and that would set up the scenario you mentioned. Cool. That should not take long to try. However, I don't recall an absolute requirement for filter parity between main and sub rx as the firmware should select the largest available even when desired BW filter BW. I know diversity quality would be impacted if the filters were not identical but I would not have expected a -freq- shift like I observed. OK I just tried WWV with Lo = 0.00 and Hi = 3.0 on A and B VFO (using BSET). I am in USB Diversity mode tuned to WWV 10.000 MHz. WWV sounds fine XFIL = FL2 (6 kHz) -- yep. this is expected. I hit BSET XFIL = FL3 (2.8 kHz) -- Actually this is what I expected since this is the widest filter on RX B where Main: 1=15k, 2=6k, 3=2.8k, 4=2.1k, 5=0.4k Sub: 1=0.0, 2=0.0, 3=2.8k, 4=2.1k, 5=0.4k ... and no mysterious frequency shift. I still can't figure out where the 1.5 kHz shift came from but I'm grateful it is gone! Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604856.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Odd freq shift in diversity mode after VFO upgrade
Dale I think you may be on to something! I just used diversity on 20M in IARU and it is obvious that - RX A is on freq - RX B is 1.5 kHz low When I use BSET I see - RX A XFIL = FL2 (6 kHz) I hit BSET - RX B XFIL = FL3 (2.8 kHz) I then adjusted Hi from 3.0 kHz to 2.8 kHz. Lo! The instant the displayed RX A XFIL changed from FL2 (6 kHz) to FL3 (2.8 kHz) I magically heard the RX B audio shift magically by 1.5 kHz to align with RX B audio. Wow. That was -very- interesting to replicate! Thanks for poking at this with me. *Now that I understand it, I can work around it. Much, much thanks!* Wayne I think we have an honest live one for you now! Cheers Rick AG6AY Interesting! Rick AG6AY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Odd-freq-shift-in-diversity-mode-after-VFO-upgrade-tp7604845p7604857.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 Message delivered to arch...@mail-archive.com
