I am using GNUradio for my uplink-only setup and that seems to work well. Next step is to include downlink reception. I have been thinking about doing LNB drift correction in software based on the beacon (as used / discussed by several people here on the forum). Instead of an FFT based approach, I plan to use a Costas loop to recover the (suppressed) carrier of the PSK400 beacon. Costas loops are designed to do carrier recovery on DSB-SCsignals (PSK can also be regarded as DSB-SC), so in theory it should work. I cannot test this out in practice however as my LNB is still on its way in the mail
Therefore, would anyone be able to send me an IQ recording of the NB transponder (including the beacons) using a PLL LNB running on its original crystal (so no drift correction or GPS disciplining used)?
Sample rate may be 480 ksamples or anything higher (not too high to limit the file size a bit). Dropbox or something similar should work to transfer the file. Many thanks in advance!
Wouter Jan PE4WJ