[Milsurplus] 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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ryK4CHE.jpg
Type: image/jpeg
Size: 121851 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20230708/459bb0dc/attachment-0001.jpg>