Leigh,
As preliminary filter alignment for SSB FL1, I recommend setting 2 markers
in Spectrogram - one at 300 Hz and the other at {filter bandwidth + 300
Hz}(- for 2.3 kHz filter use 300 and 2600 Hz). Then adjust the BFO to
center the passband between those markers.
That will produce a good quality signal for most operators. If your voice
is abnormal (or if you just want to further refine things), record your
signal on a separate receiver and play it back to evaluate your transmitted
audio.
Check out the thoughts in Ron D'Eau Clair's post on this subject too.
As a totally different thought - could the other operator's evaluation of
'off frequency and too low' be a result of his mistuning?
Did you tune so his signal sounded natural, or did you tune to some 'net'
frequency?
If you tuned to a 'net' frequency, I must ask if you had the tuning rate in
the kHz display position - if you did, there may have been hidden digits
(other than '.00' in the frequency display and you could have been mistuned
for that reason.
Be careful not to jump to conclusions on the basis of one bad report - but
it is something to review until you find reasonable answers.
73,
Don W3FPR
----- Original Message -----
On the recent topic of SSB audio reports, I got report of "off frequency"
and "too low" on 17M USB today and have not found the problem yet. RIT
and XIT were off and 15MhHz WWV was within 5Hz according to my sound card.
I did the bandwidth mod while I built my KSB2, following the advice given
here, and in the new KSB2 manual -- just about a week before the parts kit
was announced. At first I got reports of weak audio, and last night ran
through the entire Spectrogram alignment (once on WinXP with my wife's
computer, once on Linux under WINE). Now it appears to be better, but
there is still something wrong:.
This morning I was able to work KH6BB (USSS Missouri, Pearl Harbour,
Hawaii) on 18m and got in the first time. Op Lee reported that I was "off
frequency" and "too low." Any idea what to check for? The spectrogram
plot looked a lot like the one in the paper...
