Several have figured out the project. The RY's are generated by sending
a square wave using a 555. The 555 then drives an HSR series optical
switch which keys the local loop. Dovetron does a similar operation with
their RY generator. There are plenty of Chink 555 boards on ePay that
are all ready built and cost is around 2 bucks.
Photo Attached.
K4CHE
http://k4che.com/Tempvideo/RTTY%20Mystery%20Project/Mystery%20K4CHE.mp4______________________________________________________________
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