Raspy audio from K2 - conclusion

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Raspy audio from K2 - conclusion

John Lonigro
Well, despite not thinking I'd have time to correct my K2 raspy audio
until after the holidays, I managed to squeeze in a little time early
this morning and here's what I discovered:

1)  There is probably nothing wrong with the K2 or the KSB2 board, as
far as wiring is concerned.

2) Don (W3FPR) asked me a few questions, MOST of which I answered "yes"
to.  For example, my LSB and USB did sound similar (but raspy).  The
carrier was balanced well.  The two things I DIDN'T do were adjusting
the LSB and USB BF1 values for best transmitted signal quality. I guess
those little check boxes next to the instructions are important after
all (hi).  The one remaining question I have is the following:

The instructions for optimizing the BFOs say you can move the BFO as
much as +/- 200 Hz from the frequencies in Table 3.  Moving them about
100 Hz removed the raspiness,  but I had to move them about 350 Hz total
before I considered the signal optimum.  Is this setting OK or should I
back down to around 200 Hz?

Thanks to all for the suggestions on this little problem and 73's,
John AA0VE
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RE: Raspy audio from K2 - conclusion

Don Wilhelm-3
John,

You have substantiated that the problem was a BFO alignment problem.
I would strongly urge you to check the FL1 passband using Spectrogram just
to be certain you have the BFOs set correctly.  It is easier to use than to
tell you how to do it.  There are instructions for using Spectrogram in the
K2 Dial Calibration article at my website http://w3fpr.qrpradio.com

73,
Don W3FPR

> -----Original Message-----

> The instructions for optimizing the BFOs say you can move the BFO as
> much as +/- 200 Hz from the frequencies in Table 3.  Moving them about
> 100 Hz removed the raspiness,  but I had to move them about 350 Hz total
> before I considered the signal optimum.  Is this setting OK or should I
> back down to around 200 Hz?
>
>
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