[Elecraft] Bad LSB audio

[W3FPR - Don Wilhelm]

Neal,

It may be that your LSB BFO is not currently set anywhere close to the
correct setting, and your efforts are being confounded by that situation.

I recommend that you first re-do the LSB BFO setting in receive using
Spectrogram and a noise generator.  If your OP1 filter width is the older
2.1 kHz, set markers (pointers) at 300 and 2300 Hz and center the passband
between them - if you have the  newer 2.4 kHz width, use markers at 300 and
2600 Hz.

After that, proceed with your "on the air" testing to improve it if
possible - and move the BFO only a small bit at a time - and do not move the
VFO on the K2 or the Orion while doing this procedure - just set the
frequencies to match - assuming your K2 dial frequency is properly
calibrated, check that by zeroing 10 MHz (or 15 MHz) WWV and see if the
frequency display is correct.

73,
Don W3FPR

> -----Original Message-----
>
> Not being a particularly active ham on SSB, I have toyed with it
> a bit on K2
> 4490 but bought the MD-2 mic and figured I would 'tune' the BFO to give me
> decent audio. I got a couple of 'horrible audio' reports which also drove
> the decision.
>
> I tested the BFO setting using an Orion fed into my computer so I could
> record and listen to myself as I tuned. I had to remove the coax
> and set the
> attenuator on the orion to keep the signal under S9 (I do have a K2/100).
>
> Trying to adjust the LSB setting on 40m, I honestly could not
> find a setting
> that was not very hollow and a bit tinny. It was very interesting
> seeing how
> senstive the audio was to theBFO setting, a slight adjustment could really
> mean a big difference. After achieving unsatisfactory result, I glumly did
> the USB setting on 20 meters. Oddly enough, it was almost spot on with the
> original setting and I believe yields decent (if not great) audio.
>
> I also noticed (without any scientific basis!) that I had to tune about
> 300-400 Hz low on LSB to achieve the best audio while on 20m it was again
> spot on with the frequency display of the K2.
>
> Any clues as to what could cause LSB to sound pretty bad while USB sound
> decent?
>
> Thanks
> Neal k3nc
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