Let me elaborate on what I'm after here as a display option for ZOOMimg.
The pix below is a typical screenshot after ZOOMing in with a single CWU passband available for
display on the pan - ie MultiRX is disabled. The passband is 400 Hz wide and the pitch is 600 Hz. The
sample rate is 48 kbps.
The 1824.4 kHz injection freq is the blue vertical line ans is centered on the pan after the ZOOM. The
400 Hz passband here is centered on the VFO A 1825.0 freq and ranges from 1824.8 to 1825.2 kHz.
My problem here is that for CW, or any other mode for that matter, I NEVER care about the injection
freq. I generally ONLY want to see what's going on in the passband. While this can still be seen here,
zooming all the way takes part/all of the passband off screen. While the PAN control can be used to bring
the passband entirely back on screen, that seems to be a perhaps easily avoidable nuisance.
While one might be first inclined to suggest using VFO A as the freq to center the pan on instead of
the injection freq, that is not without pitfalls.
First VFO A for modes like USB, LSB, DIGL, and DIGU is also the injection freq and the passband is never
centered on this freq.
Even for CW, VFO A is not always the desired freq for passband centering as "Var 1" or Var 2" can be used
to make the passband center different from VFO A.
So something a bit more complex is required but I suspect it turns out to be very simple.
If we denote the passband freq boundaries, as displayed in the screenshots below, by FL and FH,
then (FL+FH)/2 ALWAYS represents the center of the passband being used at any given time for ANY
I am guessing that you always have easy access to the values for FL and FH in programming the Thetis UI .
After all, you need them to display the passband boundaries.on the pan. So the calculation of the passband
center freq would seem to be a simple matter.
Is that all correct?
Assuming so for now, I am proposing that you consider providing a Thetis setup option
that allows the user to select either the current injection freq or the passband center
for use in pan/panafall display centering after a zoom in ANY mode.
Many thanks and stay well!
- Passband Centered While Zooming.gif (226.26 KiB) Viewed 7276 times