[GreenKeys] Frequency Selective Limiter??

Tue Mar 12 18:08:37 EDT 2019

 Jerry is looking for info on this device. Made by National for RCN.
Looks like a couple of Burnell filters and it has a normal-reverse switch.
Is it some part of a RTTY converter?
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http://jproc.ca/crypto/fsl4.html
contact  jerry.proc at sympatico.ca
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