[Elecraft] Calibration of BFO

[Rich Lentz]

Gary:

Perhaps you can help.

I am having trouble setting up the center frequency of the narrow bandpass
filters (FL3 and FL4). I have gone through the "Calibration Functions"
section of the manual and each of the various and many guides on how to use
"Spectrogram," however, it seems like one correction offsets the other. I am
fairly sure how to adjust the bandpass width, but get confused on adjusting
the position of the bandpass and the BFO.  The band pass is at the desired
width but when I try to get it at the desired center frequency, the received
frequency is shifted.  For example, when I try to setup a 1.00 kHz bandwith
centered at 1.00 kHz for FL4 on USB (20 Meters) for PSK, the received signal
shifts by more than 50 Hz. If left this way, a QSO ends up "walking" up the
band with each exchange.

I am trying to get the minimal change of the received frequency with the
desired bandpass centered on the desired frequency. Could you please explain
how to adjust: 1. The center frequency, 2. The BFO, 3. The Band-width, and
4. Which order to adjust these.  Is there any interaction with these? Should
I run CALL PLL between any of these adjustments?  Should the CW, USB or LSB
be set first?

Thanks, Rich

KE0ZX, K2# 2260