Thanks for all the suggestions on figuring out why I was hearing the other
side of zero beat in CW Reverse on OP-1 filter. The root cause of the
problem was
I was using the BFO freqs as specified in the KSB2 instruction manual.
Which were never upgraded when they changed to 2.5khz OP-1 filter.
I corrected the BFO freq on CW Reverse to match the USB BFO freq
for OP-1 and now its just fine. Although with an S9 signal there is still
a tiny bit of signal on the other side of zero beat using OP-1.
I spent a lot of time the last two days experimenting
with different CW side tone freqs. I finally settled on a sidetone of
400hz
due it had less ringing while using AF-2 narrow band receive filter.
On weak signal DX, its easier to pick the signal out of the noise with the
audio filter set to 400hz, at least for my ears.
I used CW filters of 2.5khz, 1.2khz, 700hz, 300hz. Setting them
using the Spectogram software and then did a final minor tweaking by
placing an audio freq counter on the headphone jack and adjusted each filter
for 400hz receive tone on both CW normal and CW reverse. Then I fine tuned
the SSB filters of 2.5, 2.2, 1.8 and 1.4khz by listening to a SSB receive
signal
while making minor tweaking of Cal Fil BFO on each, until the audio sounded
the best on each filter. That really made this K2 come to life.
Its a real pleasure to use. Although it was a steep learning process
trying
to figure it all out. Thanks again for all the help from those on the forum.
Last week I built the XG-2 three band signal generator.
XG-2 is one great piece of test gear. Highly recommended.
I also just finished rebuilding and fine tuning a 1916 Vibroplex Model X
speed key.
You can see the picture of the key sitting in front of the K2 by looking up
my
call sign on QRZ.COM Frank W7IS
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