Giulio,
Unless the XV144 is operating in a non-linear region, it should not
distort the SSB signal. Should be easy enough to check the linearity if
you have a good power meter for 144 MHz. Go to CW and drive the
transverter with 1/10 the normal power - it should have 1/10 the normal
output - now increase the drive to 1/5 of normal and check again -
continue until you have covered the entire power output range in
increments. If the transverter output does not track the input level,
check the XV144 PA bias adjustment.
You might want to connect the KXV3 IF output to an indoor 10 meter
antenna and listen to the 28 MHz output on another receiver with a short
antenna (adjust to give an S-9 signal into that receiver). That will
tell you if the 28 MHz KXV3 output is clean.
73,
Don W3FPR
Giulio Pico - IW3HVB wrote:
> After a few good suggestions by Don, Jim and Fern I run a few more
> tests, coming at the conclusion that the problem was not the MIC, or its
> interfacing with the K3 or the radio itself.
> The audio on HF bands is simply perfect, with or without compression
> (and comp acts exactly as it should).
> But the problem on 144 MHz is still there, so the problem must be on the
> XV144. The Power supply is the same for both the radio and the xverter,
> tried switching and stabilized with no differences.
> I've no idea where to look...... Changing the drive power (I'm using
> the KXV3 module) does'nt produce any difference as well.
> Any clues?
>
> 73 de Giulio IW3HVB
>
>
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