Hi Joe and All,
I am getting strange, frequency dependent results, for JT65 SNR measurements if
bandpass filter is applied to the measured signal.
Using r6404-dirty, especially modified top SNR reporting threshold to 49(I
played with strong signals).
For top part of the JT65 band frequencies there is no reported SNR difference
for BPF usage, while for bottom frequencies difference is huge.
There are WSJT-X decodes, time 0000 means that BPF is applied:
1812 -25 2.9 513 # ZS1DX CT2FYQ 73
1812 27 2.4 2121 # SRY VERY WEAK
0000 27 2.4 2121 # SRY VERY WEAK
0631 34 -0.0 200 # CQ UA3DJY KO85
0000 49 -0.0 200 # CQ UA3DJY KO85
Applied BPF does not change spectrum of the measured JT65 signal there.
I have put audio files there https://cloud.mail.ru/public/3VDU/4RXAAeDD1
What can cause such difference in the noise measurements?
73 Igor UA3DJY
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