Fred,
The answers to your Dial Calibration and Filter Alignment should be found on
my website www.qsl.net/w3fpr. As you have discovered, the numbers in the
manual are a good starting point, but you can do much better. Calibration
resulting in no more than 30 Hz error is readily achievable with a bit of
care.
You can obtain the same pitch within 10 to 20 Hz when switching filters with
care in doing the alignment. The use of an audio spectrum analyzer program
such as 'Spectrogram' and a wideband noise generator is highly recommended.
You will end up doing the dial calibration and filter alignment 'sort of'
together, because the dial calibration requires that you run CAL FIL after
the reference oscillator is changed.
73,
Don W3FPR
----- Original Message -----
I've had some time to play with the brand new K2. It appears to be
working great! I actually read the manual and I think I might
understand the filter bandwith/BFO stuff and what CAL FIL is doing. I
have a question or two ... off-reflector replies are probably
appropriate since the traffic on this reflector is high:
I left a lot of my hearing in SE Asia, but I have a "sweet spot" at
about 650 Hz or so for CW. I'd like the pitch of the received station
to stay at that freq when I change filter BW's. I succeeded in getting
it close for CW NORM -- sort of an iterative process. I did finally
figure out that I needed to center the signal in the narrowest filter,
set the BFO for the right pitch, and then set it for each of the wider
filters.
1. Should I be able to do the same thing for CW REV? What I'd like is
that filter setting and NORM/REV have no effect on the pitch of the
signal centered in the passband.
I did a quick VFO calibration before I took the K2 to Alpine County for
CQP. It is still about 250 Hz off, I think. (The CQP Alpine County
expedition is a different long story!)
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