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Ferry van Eeuwen
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MMTTY
Mako Mori has written a number of excellent freeware programs. The latest releases can be found on his web site:
This is the display of the MMTTY program for de- and encoding RTTY. In the upper right corner you can see the 'cross hair' scope display and to the left the signal in amplitude beneath the waterfall display of the same signal. The receiver should be tuned in such a manner that at more or less perpendicular signals (plus sign) are shown. The oval shaped 'mark' and 'space' signals are probably due to ionospheric circumstances, causing phase shift in the signal. Even selective fading on either the mark or the space signal can be very well observed on this tuning 'scope'.
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