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Re: K-1 Poor Receive, New Build

Posted by KH7AX on Mar 17, 2015; 3:49am
URL: http://elecraft.85.s1.nabble.com/K-1-Poor-Receive-New-Build-tp7600322p7600384.html

Thanks for getting back to me Don.  I’m a bit confused.  The rig aligned and I am hearing the signal my ts590 sends  over the noise that I’m talking about.  Won’t I be finding this same signal also with the RF probe if I’m already listening to it come through the speaker?   Or are you saying that it should be louder than what I’m hearing and with the probe I could make better measurements?  I don’t have the capability to attenuate what the 590 puts into that dummy load below 5 watts.  

  Thanks for your patience!!  I appreciate it immensely.  

Joe C.

On Mar 16, 2015, at 5:21 PM, Don Wilhelm-4 [via Elecraft] <[hidden email]> wrote:

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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