Receiving 137kHz with the IC706
For WSPR at 137kHz to filter out the DCF39 signal at 0.1388kHz
I make use of the CW 500Hz filter in my IC706.
Receiving(only) with the IC706 in position CW-narrow using the 500Hz CW filter is possible
settings: IC706 Dial: 0.137500 mode CW-R (for USB this must be 0.13600 to bring the audio in the center of USB filter)
WSPR: Advanced : Rx BFO (Hz) 570 (in my case) to adjust the audio at the correct frequency in the band. (1500 by default for USB mode)
WSPR Dial: 0.137000 Brings the displayed frequency ruler 400-600 meaning 0.137400---0.137600
Tx 0.137500 (no TX Txfr =0)
Decoding is good decoding traces as low as -31db
But i have a problem that i could not fix yet:
The reported frequency is consequent 72Hz to high for all signs.The trace position and frequency at the screen are correct.
F.i. PA0A = 0.137450 correct on the screen and also this is his correct TX frequency. But it is reported as 0.137522kHz
I change WSPR dial then the ruler will display him on the wrong freq. If i change WSPR Rx BFO to 500 f.i. then the position of the trace shifts to the wrong place and frequency.
And the reported frequency stays wrong +72Hz.
All other bands report the frequency as displayed on the screen.
Only 137 is wrong.