Hello Martin:
yesterday evening I was running into a problem during CW operation with
the K2. I called CQ using the 1.5 KHz CW filter on 20m and got response
from a couple of US stations.
The signals have been quite weak ( RST 33 ), but I have managed to copy
a call sign and to give answer.
Because of sudden QRM I switched to the 700 Hz filter but lost the
signal. I have had big difficulties to "find" the signal of the US station
within the 700 Hz filter. So I switched back to the 1.5 KHz filter and
lived with the QRM.
How can I align the CW filtes, so that I can switch to the narrow CW
filters without losing the signal?
By the way: It was very impressive again, how powerful CW is under
difficult conditions!
The answer to your problem is that at least one, and possibly more) of your
BFO settings for the CW NOR (or CW REV, whichever you were using) setting
on your K2 have been adjusted to the WRONG SIDE of the filter passband.
Assuming that you are set to 40M, and have selected CW NORmal, ALL of your
BFO settings should be BELOW the center frequency of the filter. And ALL of
your CW REV BFO settings should be ABOVE the center frequency of the filter.
I would suggest you consider downloading Spectrogram v5.1.7 AND the
accompanying K2 filter alignment documents from my web site at
www.n0ss.net
and using Spectrogram to perform another CAL FIL session on your K2. The
documentation describes how to determine the center frequency of your
filter and how to use Spectrogram to perform the CAL FIL alignment.
73,
Tom Hammond N0SS
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