Hi Udo;
In addition to what N6TV suggested, also click above and below 12Watts.
You will hear the relay on the KPAIO3 riser board click.
Do that when the main RX is down, or click it a bunch to see if you can
force the problem.
If so, replace that relay.
Keith WE6R Elecraft K3/K4 Tech
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 <dk5ya at dk5ya.de
<http://mailman.qth.net/mailman/listinfo/elecraft>> 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 receivin
g 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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