Hi Edson,
PY2SDR wrote:
> Would it add too much complexity to have the frequency error correction in
> the audio base band of the decoders? This would prevent having to re-tune
> the rig and would also allow crystal controlled transceivers to also have
> frequency error correction.
This could be done, of course. For a single-band crystal controlled
WSPR rig the number from a "Frequency correction" entry widget (a
spinner control, say) could be used to alter the (audio) frequency range
covered by the decoder, fix up the reported frequencies of decoded
signals, and adjust the frequency of Tx audio tones.
For some years already, production WSPR versions have included the
ability to set a "BFO frequency" to something other than 1500 Hz. I
think that could accomplish the necessary recalibration for the crystal
controlled case.
But under normal circumstances with rig control, I see little
disadvantage to retuning the radio. We have all the tools in place, and
they work well. Several people have been testing JT4 on the 10 GHz EME
path in recent weeks, using the automatic Doppler control (both Tx and
Rx) now in v1.6.1. They are delighted with it!
-- Joe, K1JT
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