[GreenKeys] Fwd: TTY loop jack boxes - eBay

[Nick England]

Argghh - I forgot to include the link to my page with schematic and
explanation
https://www.navy-radio.com/rtty-patch.htm

In the schematic for this type of box, you will see that the LPG jacks are
shorted when nothing is plugged in. When nothing is plugged into the SET
jack, the associated equipment is in the loop. When you plug a cable into
into the SET jack, the equipment is taken out of the loop onto the cable
and the loop is shorted. This is so you can plug the equipment normally in
Loop 1 into Loop 2 for example and vice-versa (jumper SET-1 to LPG-2 and
jumper SET-2 to LPG-1).

*"NOTE: Anyone patching or unpatching circuits from a TTY panel must be
sure to pull the plug from the looping jack (LPG) before removing the other
plug from the SET (machine) jack. Pulling the SET jack first interrupts all
TTY message traffic on that channel. IT ALSO PRODUCES A DANGEROUS DC
VOLTAGE ON THE EXPOSED PLUG!"*


Nick England K4NYW
www.navy-radio.com


On Sun, Aug 8, 2021 at 3:08 PM steve bennett <raleigh_ranger at yahoo.com>
wrote:

> For those who wish to roll your own I'm pretty sure you can buy female
> jacks that have switches built in
> that bypass the jack when nothing is plugged in.
> Wonder if these do that?
>
> -Steve
>
> On Sunday, August 8, 2021, 02:27:50 PM EDT, Nick England <
> navy.radio at gmail.com> wrote:
>
>
> Pretty clear to me that you are getting both, but check with the seller.
> If you want to roll your own, I think Jim Cooper may have jacks available.
>
> This SB-6 box has 4 loops. Each loop has a line connection and a set
> connection plus two looping jacks. There are also 4 individual MISC jacks
> at the bottom.
>
> On Sun, Aug 8, 2021 at 1:59 PM John W9DDD <w9ddd at tapr.org> wrote:
>
> It's not clear to me if you're getting both.  Did I miss some clue?
>
> In normal operation this has 4 loops with 4 sets normally in the loop.
> Then there's places at the bottom for 4 optional sets?  The one I have has
> had some modifications which confuse the understanding of its normal
> application.
>
>
>
> John, W9DDD
>
>
> On Aug 8, 2021, at 12:17 PM, Nick England <navy.radio at gmail.com> wrote:
>
> Not mine, no relation, etc.
> https://www.ebay.com/itm/265258913276
>
> These are useful - look here for info - military designation SB-6/GG
>
> Nick
>
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> --
> Nick England K4NYW
> www.navy-radio.com
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