[GreenKeys] RYRY Signal plus Noise for RTTY testing enclosed

[Don Sentz]

Hello,

Have other folks posted  or do you use canned test signals for RTTY demodulator testing? I 

I made the attached 12 second long AFSK test signal using Audacity. The SNR is supposed to be +3dB. Maybe someone will find it useful for testing their RTTY demodulator performance. The SNR can be changed in 3dB steps in either direction, if anyone wants other SNRs to try.

The tones are 2125Hz = mark, 2975Hz = space, @ 60WPM.

The noise is the white noise generator provided in Audacity. I did not apply any filter to it.

There is a 4 second mark tone followed by RYRYRY...<CR><LF> then a shorter mark tone about 1 second. I think it should print about half a line of RYs, a CR and a LF. Set your player to repeat for continuous signal.

Since I do not have an RTTY demodulator yet, I cannot promise that this is a 100% correct signal as I have done a visual check only during the construction of the file. I hope someone will try it out and let me know how it works, thanks. 

Sorry about the large file size (.wav) I do not have MP3 encoder.

-73
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