[GreenKeys] Teletype 3-head TD #290317183501

[Jack]

The unit on Ebay is a real three-headed TD...each head has a
distributor shaft and contacts similar to a Model 15 keyboard.
The trip clutches are actually steel clutches like a Model 28.

And, in this unit at least, all three heads are the same. So,
all three distributors could be in series with any one of the
three heads sending to the loop. There was an article in CQ
years ago that showed how to modify the MXD to send CW ID as
well as TTY tapes...I have the article "somewhere".

73,
Jack K0TTY  






-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Duncan M.
Brown
Sent: Thursday, May 14, 2009 10:15 PM
To: greenkeys at mailman.qth.net
Cc: WA5CAB at cs.com; jdkopke at cablespeed.com
Subject: Re: [GreenKeys] Teletype 3-head TD #290317183501

Designed by Western Union with Teletype parts for the military in
WWII, the
AN/TGC-1 was the first of the "torn-tape" tape relay systems.   The
MXD
tape reader (no distributor, so it is not really a "TD") was set up to
transmit multiple tape messages through the "A" & "B" tape readers.
The
reader on the right was the "numbers" tape unit. It numbered all
messages
sent out using a special tape with just numbers on it. The first tape
to be
transmitted would be inserted into unit "A" and the start button
pressed.
The numbers tape would be read for the first message number and stop
and
then tape unit "A" would start. Meanwhile the operator would load the
second tape to be sent into unit "B".  When the first tape ended, the
numbers unit would send out the next message number and then the
second
tape would start, etc.  The MXD could also be set up to feed two
different
lines.

The AN/TGC-1 was first used during WWII and when I attended
Teletypewriter
Repairman School at Ft Gordon, GA  in 1967, they were still teaching
it
(along with M14 & M15), but  I never saw any in my four years in the
service.

The AWA Museum has a MXD, but it is not complete.  We would bid on it
but I
think shipping cost could be as much as the item itself.  If anyone on
Greenkeys buys this, we would be interested in the extra tape reader
head
as we are missing one.

Have fun,

Duncan Brown, K2OEQ
USASA  31J

Chief TTY operator & repairman
AWA Electronic Communication Museum
http://www.antiquewireless.org/


> [Original Message]
> From: <WA5CAB at cs.com>
> To: <jdkopke at cablespeed.com>; <greenkeys at mailman.qth.net>
> Date: 14-May-09 22:15:53
> Subject: Re: [GreenKeys] Teletype 3-head TD #290317183501
>
> It's late 14/15/19 vintage.  One was used along with two M14 typing
reperfs 
> in the AN/TGC-1 tape relay system.  Uses the same sync motor as fits
the
14 
> and 15.
>


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