Yes, the passband of the 12mhz filter can vary by rig.
The fix is using a PBT function within the configuration menu
to get the best audio on an LSB signal.
Could be that the 45mhz passband varies significantly by rig as well, making USB sound different than LSB.
So symptoms like what Gerald's original post to this thread describes.
If so, we need another configuration menu item to scoot around clk1 an equal amount for USB and LSB
as described in post 44182:
> If the 45mhz crystal filter sweeps out to be somewhere else, then add the difference to those two figures.
> For example, if the center is found to be at 44.997mhz (so 2khz higher) then the two figures for clk1
> should be 56995000 hz and 32999000 hz.
?
Should be able to do this all by ear if stuff is working but just off a bit in frequency.
If not working, then might need a diode RF probe or Nik's AD8307.
Plotting from the Raduino onto the USB host could be done as per post 32630.
Jerry, KE7ER
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On Sun, Mar 11, 2018 at 11:54 am, Michael Shreeve wrote:
Also, seems like Ashar, some time back, not sure he was talking about BITX40 or uBITX had said that the crystals used for these passbands were not always using quite the same frequency due to the fact that the folks he had making the crystals were not always providing accurate crystals ? He indicated that they would go through the crystals and match them for a group.? So , occasionally , if this is true, the passband of the filter could be different a kc or two ? A Vector Analyzer or tracking generator plus scope could verify this, but, you'd need access to a bunch of radios.?
