[GreenKeys] jackfields

[Roy Morgan]

On Feb 16, 2009, at 10:55 PM, <eugene at hertzmail.com> wrote:...
> So I’ve decided to bite the rather large bullet and wire up a whole  
> bunch of TRS jacks in place. Now, if I could only figure out the  
> correct wiring! I’m sure I’ll figure it out hihi!
>
>

Eugene,

There is a wonderful little gadget used by WE and by the Army that  
appears to be VERY versatile.  It's called the 63 C 1 Telegraph Loop  
Switchboard.  I'll send you off list a picture of one and the diagram  
I found inside.  It uses T-S jacks, but I suppose you could adapt the  
ideas to TRS jacks also.  The thing "normals" a loop through a "Set"  
jack and two "Looping" jacks for each of four separate loops.  So  
there are three jacks for each normal loop: one for the "set" (the  
Model 15, for instance), and two jacks to allow you to insert  
something else into the loop: a T/D or typing reperforator, for  
instance.

So with no plugs inserted, the three jacks hook the line to the set.

In most of these switchboards, there is also a row of four  
miscellaneous jacks for hooking in other equipment.  I puzzled it out  
and came to the conclusion that I could run a LOT of equipment with  
one of these little boxes and hook anything to anything else.

The early editions of "the Green Book" have diagrams of a teletype  
test board which contains many of these features and more.


Here are my thoughts on the TRS jack field for loop supplies:

- little kids are unlikely to get a finger far enough into a quarter  
inch jack to get bitten
- A dangling TRS patch cable can be just as hot as a jack, and more  
likely to be grabbed by the little one.
- You could make a cover to go over the jack panel and cords to keep  
small fingers away
-All my strong talk to our 7-year old about the electric fences we've  
had may not have sunk in. I expect she'll get bitten once and then I  
won't have to worry any more.


You asked if the bantam the same as PL-068:  No, not at all.  The  
bantam plugs are much smaller than the PL-068.


Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073