Thanks to all so many who replied, also off list.
I found the K1 relay on the SUBIN board to be faulty. Ordered a new one
and will see what happens after.
73 Udo, DK5YA
hashtag: #cantwaituntilmyK4arrives
Am 08.05.2021 um 10:55 schrieb Udo Langenohl - DK5YA:
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
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