[GreenKeys] AN/FGC-38 Torn-Tape Relay Equipment

[David F]

Most, if not all tape relays had TWO reperforators on the same circuit.


However, one was used just to RECEIVE and then the received message was
transmitted, as needed over the appropriate circuit.


The other perforator was connected to the relay stations' SEND side. It's
job was to produce (keep) a MONITOR copy of whatever was transmitted over
the sending side of the circuit. MONITOR copies were needed in case of
mass ZFXs or "pull backs" due to circuit outages, or whatever.


Every circuit in a relay station had a MONITOR tape position for that circuit.
These monitor banks were usually under the purview/control of the Floor Services
Service Clerk.....


This repeforator was never used as a spare on the RECEIVE side, as it
was not even connected to the receiving side of the circuit.


Dave


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-----Original Message-----
From: Jim Haynes <jhhaynes at earthlink.net>
To: Paul Birkel <pbirkel at gmail.com>
Cc: 'David F' <nnn7dxb at aol.com>; greenkeys <greenkeys at mailman.qth.net>
Sent: Tue, Aug 29, 2017 7:56 am
Subject: RE: [GreenKeys] AN/FGC-38 Torn-Tape Relay Equipment

The tape-changing reperforator is simply an ordinary one wired into the
same circuit as the regular reperforator - in fact the regular one and
the tape changing one switch roles as the operation goes on.  The tape
changing reperforator is simply turned off until it is about time to
change the tape - then it is switched on, and the other reperf is switched
off at the end of the current message, if any.

If you consider a device like the AN/TGC-1 that has two reperforators and
a three-headed tape reader, one head used for message numbers.  It could
be hooked up to two different circuits (in which case the message
numbering works on only one circuit, as I recall)   Or it can be hooked up
to a single circuit, where the message tape readers work alternately 
(called flip-flop operation sometimes) and the two reperforators can copy
the same traffic, but only one at a time turned on except during the
changeover.  So the whole cabinet can be used for two low-traffic circuits
or one high-traffic circuit.


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