Digiscope Display


MFSK modes

This is what you expect to see for all of the MFSK type modes.  This includes MFSK-8, MFSK-16 and all of the the dominoEX modes.  The number of steps in the slant lines will change with the various modes, but they will all have the same general appearance.  If the signal is mistuned the sloped lines will become bowed and distorted.




CW mode

The CW signal will consist of the time domain amplitude detected signal.  The horizontal timing is dependent on CW speed, so that the display will appear similar independent of CW speed.





RTTY mode

The signal can be viewed in two different ways on the digiscope.  This is the time domain representation of the detected FSK signal.  The two yellow lines represent the MARK and SPACE frequencies.  This display is for Baudot, 45.45 baud, 182 Hz shift.  If the tranmitting station were transmitting at 200 Hz shift the signal extremes would lie above and below the yellow lines.  Try tuning across the RTTY signal with the AFC disabled.  You will see the signal move above and below the yellow lines as you tune.  Then enable the AFC and the signal should rapidly move into the center region of the display.  This signal was about 3 - 6 dB above the noise floor.  It looked marginal on the waterfall but still gave good copy.


This is the other digiscope display for RTTY.  You obtain this view by left clicking anywhere in the digiscope display window.  You can toggle back and forth between these views.  The MARK / SPACE frequencies are represented by the RED and GREEN lines.  When the RTTY signal is properly tuned in the lines will be in quadrature and aligned as shown.  Tune across the RTTY signal and the MARK/SPACE lines will rotate around the center.



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