[GreenKeys] TTY loop jack boxes - SET, LPG, MISC

[Nick England]

https://www.navy-radio.com/commsta/ics-vietnam.htm


On Mon, Aug 16, 2021 at 9:00 AM Sheldon Daitch <sheldondaitch at yahoo.com>
wrote:

> Paul,
>
>
> Maybe Nick can find something on his web site faster than I can, but he
> had two publications from Regional Communications
> Group (RVN) with details on multiple patch panel configurations, both
> audio and TTY.   I can't find them, so, Nick, what are
> the URLs to those two pubs?
>
> The RCG fixed station comms sites had multiple TTY tone pack circuits and
> the connection to and from the TTY users, in
> almost all cases, was 60mA DC looks.   The TTY circuits were typically 16
> TTY channels in a tone pack for the radio side
> and 16 DC circuits leaving the comms building to the outside TTY users.
>
> Okay, I am getting lazy to dig, but I could not find on my quick, dirty
> and lazy initial search.
>
>
> 73
> Sheldon
> WA4MZZ
>
> On Monday, August 16, 2021, 08:15:23 AM EDT, Paul Birkel <
> pbirkel at gmail.com> wrote:
>
>
> Nick:  So I read the action of LOOP backwards :-<.  I found that schematic
> in http://www.navy-radio.com/tty/ttypatch-usa-01.pdf as Figure 17.  It’s
> labeled there as: *TYPICAL BLACK SEND AND RECEIVE **DETAIL "G"  *Maybe
> the division of the patch panel into “left” and “right” parts, which I
> don’t understand, explains it … somehow?
>
>
>
> *From:* Nick England [mailto:navy.radio at gmail.com]
> *Sent:* Monday, August 16, 2021 7:30 AM
> *To:* Paul Birkel
> *Cc:* Greenkeys
> *Subject:* Re: TTY loop jack boxes - SET, LPG, MISC
>
>
>
> In your new diagram, if you plug into LOOP it will short the EQUIP lines
> together. I don’t know the intended purpose of LOOP. There’s no reason to
> ever plug a dummy plug into SET unless you just want it to run open.
>
>
>
> In the SB-1210, the second SET jack acts just like the first. The
> associated equipment is either in the loop or patched to another loop. You
> might have a printer on SET1 and reperf on SET2 if you usually wanted a
> tape copy as well as printed copy.
>
>
>
> On Mon, Aug 16, 2021 at 5:03 AM Paul Birkel <pbirkel at gmail.com> wrote:
>
> OK.  More grist, thank you :->.  I found the following diagram in another
> document last night.  It just seems weird to me.  Can you explain?
>
> --
>
> Nick England K4NYW
> www.navy-radio.com
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-- 
Nick England K4NYW
www.navy-radio.com
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