Hi Gary, Jim, and all,
Gary wrote:
Michel (F5WK) is now almost not seen on the WSPR & SpecLab display but the
signal is decoding fine. With the current settings I have reduced the
received signal strength but both are decoding no problem.
Earlier in the evening Michel's signal was quite strong on both displays but
no decode.
I have set the Rx to SSB, 500Hz filter & external tuned pre-amp to moderate
gain. The antenna is Mini-Whip.
Inspired by this, I switched one of the TS 850's IF filter from 2.7 kHz
to 500 Hz, and centered it on 1500 Hz audio (which is possible in SSB
with the passband tuning knob). Expected a better SNR because there's
plenty of QRM around here, but :
(a few decodes with full 2.7 kHz SSB bandwidth) :
2128 -21 0.0 0.137577 0 F5WK JN18 37
2130 -20 -0.2 0.137500 0 M0BMU IO91 23
(now switched to 500 Hz audio BW, around 1500 Hz center)
2134 -26 0.0 0.137577 0 F5WK JN18 37
An SNR *drop* of 5 dB (for F5WK) within 6 minutes; don't think this is
caused by "propagation".
Apart from that, I never had a "zero" offset for the DT parameter, so
apparently Michel must have a very precise time reference. Or it's just
coincidence.
Will switch back to 2.7 kHz bandwidth now to check if the SNR values
increase again.
Cheers,
Wolf .
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