For an upcoming Frequency Measurement Test, I'm trying to use a K3 in
AM Mode RX-only with a 250 Hz CW Filter. My plan for the FMT is to use a
GPS Disciplined Oscillator as a BFO, and by measuring the frequency of
the beat tone, I will be able to accurately determine the mystery
transmit frequency, without worrying about the dial calibration or drift
of the K3 itself.
It works fairly well with the standard 2.7 KHz filter, but, the WIDTH
control only reduces the DSP bandwidth down to 1.35 KHz. 1.35 KHz is
pretty wide if there is QRM near the mystery signal. I tried using the
XFIL button to manually switch in the 250 Hz filter, but signals don't
seem to pass through when I do that, and then when I touch SHIFT or
WIDTH, the roofing filter switches back to 2.7 KHz.
Is there a way to accomplish what I'm trying to do? My alternative is
to set up a narrow digital filter in the tone recording software, but it
is still disconcerting to hear a bunch of QRM around the mystery signal
in real time.
Thanks in advance.
Dave Hachadorian, K6LL
Yuma, AZ
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