Does rotating the MAIN RF GAIN knob back and forth make any difference? Or tapping the ANT or RX ANT buttons a lot to exercise the antenna relays?
I assume both receivers are listening to ANT1, and nothing is connected to AUX RF or RX ANT. What happens if you move the coax to ANT2? 73, Bob, N6TV On Sat, May 8, 2021 at 1:55 AM Udo Langenohl - DK5YA <dk...@dk5ya.de> wrote: > Gentleman, > > I have a problem with the main receiver on one of my K3s. The main > receiver is between 6 and 8dB worse than the second receiver. The stupid > thing about it: it is not always like that, but the poor sensitivity > comes sometimes creeping or sometimes suddenly. It seems to have > something to do with the transmit / receive switching. I checked this > very carefully with an HP8664A signal generator and a spectrum analyzer. > Sometimes both receivers are exactly the same, then the main receiver > slowly gets worse and worse (within a minute the amplification drops by > 6-8dB) sometimes it happens immediately after switching from RX to TX > and back. Then it happens that after switching from RX to TX and back > again, both receivers are the same again. It can also happen that the > main receiver is initially 8dB worse than the second receiver, but > without RX / TX switching the missing 6-8dB are suddenly there again - > in the middle of receiving mode, without switching. So it's intermittent > and it drives me crazy not to find out what's going on. Is that another > bad pin diode somewhere in the main receiver and if so: which one? Maybe > someone has an idea? Help is very much appreciated. > > This is a K3 #56xx with all features and all upgrades so its more or > less a K3S rather than an K3. > > 73 Udo, DK5YA > ______________________________________________________________ > 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 n...@arrl.net > ______________________________________________________________ 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
