Joe,
Yes, a shorted Q10 will cause the audio to be muted all the time.
The K1 will operate without Q10 installed, so that is your first
troubleshooting tactic. However, without Q10, the receive audio will
not mute when in transmit - just something to be aware of when
evaluating the effects.
If removing Q10 does not solve the RX problem, you will have to resort
to Receive Signal Tracing in the back of the K1 manual. You will need a
strong signal source and an RF probe to do that tracing. The Elecraft
signal generators do not have sufficient output for that testing - I
would recommend building the oscillator shown in the manual - the
crystal should be within the tuning range of your K1.
73,
Don W3FPR
On 3/16/2015 5:37 AM, KH7AX wrote:
Just finished my new K-1 build and seem to be having way too much noise on
receive.
I used my TS-590s into a dummy load at it's minimum output of 5w on one side
of the room and the K-1 into another dummy load on the other for signal
generation and freq alignment (the 590 has a freq stabilizer installed).
All the alignments went well and the K-1 fine tuned with full output power
on both boards. I have (40/20) installed now and a (30/17).
However, the noise levels with and without an antenna connected are
identical. It's more hard of hearing than I am. I've read some previous
posts regarding receiver sense and the possibility of a bad Q10. I was
wondering if the recommendations would be the same in my case. Should I
remove Q10 and see if that does the trick? I was hoping to take the rig on
vacation with me. If the replacement doesn't make it before I leave, would
it be ok to take the rig with me and replace the transistor when I return?
Thanks for the advice. I love this little rig and want it to run well.
Joe, KH7AX. Hawaii County
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