[GreenKeys] ebay "Teletype Message Numbering Module"

[Nick England]

ZCZCNYW002

I have added "Principles of Operation" for this module
http://www.navy-radio.com/tty-relay-equip.htm#number
I see the seller has listed another - I think she has a batch so maybe the
price will come down if no one is hot to trot for one...
http://www.ebay.com/itm/221364685110

Nick England K4NYW
www.navy-radio.com


On Sat, Jan 11, 2014 at 3:23 PM, Nick England <navy.radio at gmail.com> wrote:

> ZCZCNYW001
>
> Teletype 173520 Message Identification And Numbering Module Assembly
>
> Howdy gang - I identified this eBay item as the message numbering unit
> used in 28 Torn Tape Relay equipment, in particular the Transmitter Group
> which has two triple-TD trays and 6 of these numbering units. The military
> version is TT-333A/UG and you can see photos at
> http://www.navy-radio.com/tty-relay-equip.htm
> I also got front/rear views from the eBay seller and added them a little
> further down the page.
>
> I have one triple-TD tray and got 3 of these numbering units from the eBay
> seller with the intent of creating a "half-size" TT-333A/UG.
>
> As Jim Haynes said, these units generate the header for a tape that you
> are going to transmit. The stepper relay connects 15 sequential characters
> in 5-wire parallel to the distributor on the corresponding TD in the
> equipment cabinet. There is also a tandem mode where one numbering unit
> controls two TDs in alternating sequence so that you can load one message
> tape while the other is being transmitted. Clever lads, those Teletype
> chaps....
>
> When you load a tape and switch to RUN on a TD, the numbering unit first
> generates the following sequence:
> (LTR)ZCZCABCDE(FIG)123(LTR)(start_message_tape)
> where 123 is from the sequential message number counter,  ABC are
> customer-wired characters, and DE are customer-defined characters by two
> plug-in code cards (visible in the front photo).
>
> The eBay seller has some more and will post them for sale I presume - I
> got 3 of them for $60 ea. (yeah, too much but better than the original $950
> ea. listing...)
>
> If you are interested in these things, I will be scanning and posting
> description, parts, and wiring diagrams over the next couple of weeks.
>
> Cheers,
>  Nick England K4NYW
> www.navy-radio.com
>
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