K1 Filter Board Issue

[Jeremy Klotz]

Hello,
 
I recently finished the receiver portion of my K1 (40m/20m).  I successfully aligned the 20m filters, but on 40m there is very little noise, and the noise does not change when there is an antenna connected.  However, I have received some very nice signals on 20m.

I have inspected the filter board joints and checked the relays to verify they are in the correct position.  From the troubleshooting, it appears the only option left is to check the crystals, but I do not have an oscillator handy.  I am now wondering how to verify the 40m crystal is working properly since I only have a digital multimeter.  I was thinking an RF probe would be helpful for this, and I could definitely build that. I appreciate any help.
 
Sincerely,
Jeremy Klotz
KD9BPB
 
 
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[Don Wilhelm]

Jeremy,

Yes, an RF probe would be useful to evaluate the health of the crystal
for 40 meters.
Since those crystals are reliable, I suspect that you have a problem
with the Pre-Mixer Bandpass Filter.

You need to have at least 200mV peak to peak signal (70 mV measured with
an RF Probe) to provide a good signal level to the mixers.

I am on vacation right now, so I do not have the schematics available
right now to give you specific probe points,  I can give them Monday if
you have trouble locating them.

73,
Don W3FPR

On 12/8/2016 10:36 PM, Jeremy Klotz wrote:
> Hello,
>
> I recently finished the receiver portion of my K1 (40m/20m).  I successfully aligned the 20
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