Mike,
Since you have 2 K2s there, you can inject the same level signal into
each one while taking 'scope or RF Probe readings on each.
It is rare to have low BFO output or a bad NE612. I would suggest you
look carefully at the IF amplifier instead.
73,
Don W3FPR
On 12/26/2025 11:02 AM, Mike Furrey wrote:
Hi all,
I have finally had a chance to help out with my friends K2. Using both
the RF signal generator and an AF generator, signals do get through on
all bands but is very weakly. Even with the signal generator on the IF
frequency, the signal is very weak, even at the input to the detector.
We injected an AF signal at the output of the detector and it is very
robust ... great audio and volume.
What I have noticed ... The maximum strength on the S meter (still
low) occurs when the signal is zero beat, weather a signal is injected
at the antenna or an IF signal is injected at the input to the
detector, the NE612. I am currently suspecting a bad BFO output or an
alignment somewhere. That is currently where we stand. Any suggestions
before we start again in the New Year? Thanks.
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