[GreenKeys] Mystery RTTY Project

[B. Smith]

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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