[Elecraft] Help needed with SSB problem
Francis Belliveau
[email protected]
Thu Jan 23 09:23:01 2003
Okay gang, the filter adjustment seems to have fixed the Tx imbalance.
However, it brought up a number of newer issues.
I have posted a web page showing the spectrgram plots for my rig at:
http://home.attbi.com/~flb/K2_Orig/Desc.htm
Setup conditions are listed there.
1. The PDF effectively says to set the markers 1900 Hz apart centered
at 1450. My OPT1 filter seems to only be 1200 Hz wide. Does this indicate
a problem?
2. The CW and CW-Rev plots show what looks like different filter band
widths for FL1. I do not think that I have changed the filter widths from
default. Yet CW looks to be about 1100 Hz wide and CW-Rev only 800 Hz. Why
are the widths different?
3. I had done a rather precise job of adjusting the CW filters using a
frequency counter and one of the birdies. Yet the center frequencies on the
plots are at 800 Hz and 500 Hz. I seldom use CW-Rev but I do remember that
I had set things up such that the note did not change when I was spotted
right on a signal. My sidetone pitch is set for 600 Hz. I used spectrogram
to center the 40M birdie at 600Hz. The frequency readout was 7000.01 at
that point and I could detect no difference between CW and CW-Rev. I added
the noise generator and turned the RF gain back down to 12 O'Clock. I looks
like there are 3 peaks across the top of the CW filter and I am centered on
the left peak. The CW-Rev filter only had one off-center peak that the
birdie is centered within. This is curious but I don't know if there is a
problem indicated here.
Am I blowing smoke at a dead dragon or breathing fire at a live one?
(No real problems or something to look into before proceeding with A-to-B)
Fran