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I believe it works in a similar way as the PBT (or "clarifier") function
in the Raduino v2 software for Bitx40.https://github.com/amunters/bitx40-raduino-v2/blob/master/PBT.png
It allows the user to slightly shift the BFO frequency from the frontpanel
(only during RX of course).
It's not IF shift in its true sense, but the behaviour is quite similar.
I have the impression that not many BitX40 builders actually installed
this mod, which has always surprised me as I personally find it a very
73 Allard PE1NWL
On Sun, March 11, 2018 00:52, Jerry Gaffke via Groups.Io wrote:
OK, so IF-Shift is just a BFO offset (relative to the crystal filter
that is for receive only, the transmit BFO offset generally stays put.
I went off into the weeds there because Gerald's original query stated
Â In LSB I can adjust the received sound with the IF-Shift with aSounded like there was something more going on.
very pleasing effect, but this does not work the same with USB.
But could be just that the code didn't quite handle the USB case
Yes, eventually I'll move on to try some of the newer software.
But for now have my hands full with other projects.
On Sat, Mar 10, 2018 at 02:49 pm, Mike Woods wrote:
Most commercial rigs have an IF Shift or Passband Tuning (PBT)
This control can help with removal of QRM on receive ( e.g.by (
http://e.g.by ) eliminating a strong carrier or another station on the
of the passband by shifting the passband up or down by a few 100 Hz. It
can also compensate for a poorly adjusted frequency response on a signal
that is being received (too bassy or too trebly).Â
Ianâ€™s software implements just such a control.Â It functions in a
manner to the BFO calibration routine, in fact, but unlike the
function, it should only operate on RX. This was the bug - it didnâ€™t
off on TX.Â I checked on my uBITx and found the same problem here.
If you havenâ€™t tried the KD8CEC firmware you should.Â It has a number
other worthwhile software features!