[Elecraft] filter settings

[Ron D'Eau Claire]

Hello, John:

The SSB Filter bandwidth is not adjustable. The only adjustment is to
set the BFO frequency to position the filter bandpass correctly in
relation to the audio bandpass. The "width" position must be set to OPT1
for both upper and lower sideband to enable the SSB board filter. 

I set it up according to the SSB Module book for a start, then made fine
adjustments by listening to myself on an auxiliary receiver. I found
that Spectrogram was rather useless for getting the BFO frequency right
for SSB - it doesn't give one a clue about what the signal actually
sounds like. I set up an aux receiver and, using phones, tuned in my
signal with the r-f gain all the way down (and the K2 near minimum power
into a dummy load) then recorded myself so I could sit back and actually
hear what I sounded like. Fine adjustments were then made on both
sidebands until I was pleased with the results. 

That took care of FL1 position in the SSB modes. That defines the BFO
frequencies for transmit too, no matter what filter you use to receive
with. I have FL2 and FL3 set to provide slightly higher and lower
pitches. That's sort of a "poor man's bandpass tuning" available by
switching between filters. You can actually "fine tune" them listening
to an on-air signal if you want.  FL4 uses the CW filter set at about
400 Hz bandwidth for receiving PSK31. Helps keep some of the "rock
crusher" signals off out of the passband. 

CW filter bandwidths are adjustable of course. Some ops like 'em
"tight", others like 'em "wide". I'm a member of the latter group. I
have mine set for "OPT1" (2+kHz), 1.6 kHz, 1.0 kHz and 400 Hz. I use 1.6
or 1.0 kHz 99% of the time. 

Like most choices, there is no "right" vs. "wrong" there. 

Ron AC7AC
K2 # 1289
-----Original Message-----
Curious how some of the k2 users with the cw and ssb module have set
their cw and ssb filters bandwidths.

john