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

[Paul Birkel]

Also from Nicks’ site: http://www.navy-radio.com/manuals/sb6-gg-tm11-2035-4408.pdf

This one has some nice circuit diagrams showing the details of jacks, plugs, and the effects of typical patch cord use.

The SB-6/GG looks rather like the original eBay items in configuration.  Four circuits, each with LPG1, LPG2, SET, and MISC.

 

From: Sheldon Daitch [mailto:sheldondaitch at yahoo.com] 
Sent: Monday, August 16, 2021 9:40 AM
To: Nick England
Cc: Greenkeys; Paul Birkel
Subject: Re: [GreenKeys] TTY loop jack boxes - SET, LPG, MISC

 

So easy, wasn’t it. Thanks, Nick.

 

In one of the pubs are several diagrams of the patch panels used in Vietnam fixed station comms.

 

Sheldon

Sent from my iPhone





On Aug 16, 2021, at 9:26 AM, Nick England <navy.radio at gmail.com> wrote:



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?

<image001.png>

-- 

Nick England K4NYW
www.navy-radio.com

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Nick England K4NYW
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