[GreenKeys] Measuring demodulator performance.

[Harold Hallikainen]

I just finished running some tests on a couple demodulators using AM and
FM modes at both 170 Hz and 850 Hz shift. The test consists of
transmitting RY 1050 times on 20 meters at 4 watts from Tucson AZ and
receiving the signal on the KFS SDR. The signal is recorded, then run
through the demodulators and counting the number of R and Y characters.
It's possible that an erroneously decoded character could end up being an
R or Y, but that seems fairly unlikely. However, in one test, I did get 1
or 2 more Rs than transmitted. It's interesting that in most cases, though
not all, I received more Rs than Ys.

The notes are at https://w6iwi.org/rtty/DspTU2/index.html#RYcount .

Harold
https://w6iwi.org




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