I tried but failed to decode WSPR using Tecsun PL-600 receiver that tunes in 1KHz step. I heard tones with good SNR but cannot be decoded. So, I mis-set it somewhere.
Is it correct that transmission is around 10.140200MHz, with a few Hz bandwidth?
What are the four symbol RF frequencies? I seem to read documentation saying that they are 10.140200 + (0_to_3 x 1.4648Hz). I observed WSPR sound card output, using Spectrum Lab software, and they are spreading from 1497 to 1503 Hz, instead of 1500 to 1506Hz. Where did I miss?
On a 'normal' receiver, should I set the receiver frequency to 10.138700MHz, get audio at 1500Hz and WSPR software will auto search and decode signal around 1500Hz?
On my receiver, is it correct that audio will be 1200 and 2200Hz, when dialed to 10.138 or 10.139MHz? Will WSPR software auto search to 1200 and 2200Hz? If not, can I set it in the software? Or, I should vary BFO to make it "back to" 1500Hz?
Are the below tabled calculation of LO and BFO, etc correct?
The receiver only have setting of AM/SSB. It does not have separate setting for USB and LSB. It has a BFO knob with a 'central click" which got a good zero beat for 10MHz time signal.
To get effective USB mode, I believe I should turn it "away from the central click" in order to set BFO to 453.5KHz, right?
- If I turn the BFO knob to the "wrong" direction, setting BFO to 456.5KHz, resulting in LSB mode, I will hear similar signal tone, but, the 4 symbols are in "up side down frequency order" and cannot be decoded. Are these right?