Re: [Elecraft] XVTR Out level
Hi Gary could you perhaps chose 2 transverters 144MHz and 145MHz and set the levels accordingly? Fortunately all my transverters have a 28MHz IF. Another Elecraft 'surprise'. The worst one for me is the K3S TX IMD on 6m, its really quite awful and not good enough for me to use. So I suppose that I will end up using the transverter port for 6m as well. Its a shame because the RX is outstanding. You will love the performance of the Kuhne transverter with the K3, its the best combination that I have found for the band. 73 Conrad PA5Y From: elecraft-boun...@mailman.qth.net on behalf of Gary Johnson Sent: 09 July 2019 06:10 To: Elecraft@mailman.qth.net Subject: Re: [Elecraft] XVTR Out level Sure enough, the BPFs are in the low-level RF path on TX and RX. Moral of the story is to choose a transverter with a 28 MHz IF when maximum usable frequency range is desired. Gary NA6O __ 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 g0...@g0ruz.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] XVTR Out level
Sure enough, the BPFs are in the low-level RF path on TX and RX. Moral of the story is to choose a transverter with a 28 MHz IF when maximum usable frequency range is desired. Gary NA6O __ 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] XVTR Out level
Guess I’ll have to study the K3 block diagrams. For some reason I thought Xvrt Out didn’t go thru the BPFs. -Gary NA6O On Jul 8, 2019, at 5:14 PM, w4sc wrote: > > At 15MHz you are starting to be out of the 20M passband filter, at 16MHz you > are well out of the 20M pass band,,, the passband on 10M is around 2 or 3MHz > wide and thus would provide the proper drive level for 144 (28MHz), 145 > (29MHz), and 146 (30MHz) MHz operation. > __ 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] XVTR Out level
At 15MHz you are starting to be out of the 20M passband filter, at 16MHz you are well out of the 20M pass band,,, the passband on 10M is around 2 or 3MHz wide and thus would provide the proper drive level for 144 (28MHz), 145 (29MHz), and 146 (30MHz) MHz operation. From the K3 users manual, pp71: Band-Pass Filters (BPFs) At back-left is the bank of ham-band BPFs. These filters are just wide enough to cover each ham band, so they provide good rejection of IMD products during both transmit and receive. Hi-Q components, including large toroids, ensure low loss and high signal-handling capability. Regards de Ben W4SC Sent from Mail for Windows 10 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] XVTR Out level
I'm testing the K3 XVTR output level for use with a Kuhne 144 transverter (opt. 05) which uses a 14 MHz IF. XV1 PWR is set to 1.5 mW as required. Checking with my spectrum analyzer, key-down CW output power at the XVTR Out jack varies as follows: VFO=144 MHz (14.0 MHz out) +1.3 dBm 145 (15.0) -4.8 146 (16.0) -17.5 Needless to say, the Kuhne output power varies proportionally. I also tested with XV1 IF set to 28 MHz and power output is flat. This 14 MHz level variation is unexpected; anyone seen this before? Gary NA6O __ 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
