[Elecraft] Audio Improvements on a K2

[Ron D' Eau Claire]

> ...I personally use Spectogram to set the OP1 filter for SSB, and in
> doing so I
> set markers at 300 and 2300 Hz, then adjust the BFO so that the displayed
> passband fits evenly between those markers with particular
> attention at the
> low frequency end (I look at the slope) - it works for most voices, but an
> individual can adjust slightly higher or lower if one needs to compensate
> for his/hers particular voice.

> Don Wilhelm

Very interesting info, Don.

Since I always prefer speak from recent personal experience with the K2 when
I answer a question, I fired up mine into a dummy load and listened on an
auxiliary receiver to tinker with the SSB BFO settings today. It had been a
year or so since I last looked at them anyway.

Then with the K2 set up for the best audio quality for my voice, I plugged
in Spectrogram and compared what I saw with your message.

You won't be surprised when I say that the bandpass is nicely centered
between the 300 and 2300 Hz markers, Hi!

By the way, I went back and looked at my BFO frequency settings when all was
done. They were right on 4913.5 for the lower sideband and 4916.3 for the
upper sideband - the EXACT frequencies Elecraft says to use in the SSB
module instructions.

So all of my fiddling and testing simply validated Elecraft's
recommendations.

I heartily recommend a "real world" audio check as the final test to anyone
adding the SSB module to their K2, regardless of whether they set the
frequencies to what Elecraft recommends and leave them there or if they use
some other procedure to arrive at the "best" settings.

Ron AC7AC
K2 # 1289