[GreenKeys] Long Frame Jacks

[Frank Carraro]

		There were several styles of these long frame jacks.   The one shown is a
3 conductor  T-R-S  which would be used in telephone circuits.   Jacks for
telegraph circuits were two conductor T-S jacks. There were what was called
"loop" jacks and "set" jacks.   The loop jacks were to insert an instrument
in series with the loop.  The set jacks would cut an instrument out of the
circuit so that it could be patched into a different circuit.  By
"instrument" was meant a relay or sounder etc in Morse circuits, or printer,
TD or whatever in a teletype circuit.  If a tape punch suddenly started
mangling tape, and there was another machine in the office that was idle, it
only took a few seconds to patch the spare into the circuit.  Telephone
jacks had a similar arrangement with jacks for "line" and "drop".  All of
these different jacks had different combinations of springs
	These jacks were not used in switchboards.  They were for test boards.  I
have some of them as well as mountings which can be installed on 19 inch
racks. When I had my teletype equipment, a hub repeater and my TU running at
home it was all wired through jacks like this.   I wish I could have bought
them at junk prices.  They cost me upwards of $5.00 each as I remember.

Frank


-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net]On Behalf Of AI2Q
Sent: Wednesday, October 16, 2013 9:21 PM
To: Jeffrey D Angus; greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Long Frame Jacks


I have some of these if anyone needs 'em.

Vy 73, AI2Q, Alex
Member: ARRL, FOC, RSGB, CWops, QRP-L, Antique Wireless Association, New
England Radio Discussion Society, DXCC Honor Roll, 16ØM DXCC, 8ØM DXCC
http://home.roadrunner.com/~alexmm


----- Original Message -----
From: "Jeffrey D Angus" <jdangus at att.net>
To: <greenkeys at mailman.qth.net>
Sent: Tuesday, October 15, 2013 11:16 PM
Subject: [GreenKeys] Long Frame Jacks


> Remember these? Long frame jacks like they used in the telephone
> switchboards...
> <http://elcodis.com/photos/17/12/171288/mt346.jpg>
>
> Used to be able to buy them surplus by the pound because they
> needed a screw to hold them in place.
>
> By the way, does anyone have one of those with the 0.206-210"
> hole? (For the old military microphone plugs.)
>
> Jeff-1.0
> wa6fwi
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