[GreenKeys] Revised ---

[Jack Hart]

I don't think microcomputers were around when that TU was built. 

It might be a version of the IF Converter from the "New RTTY Handbook".

Two polar relays were often used: one to key the TTY and one to key the FSK

circuit in the transmitter.

There's a wealth of information in the old RTTY handbooks.

Everyone should have a set of them and read them thoroughly. 

They can answer a lot of questions.

 

Jack K0TTY

 

NNNN

 

 

 
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