[GreenKeys] Long Frame Jacks

[Peter Gottlieb]

I would like to add that the TRS telephone type plugs have a narrowed ring and 
the jacks are constructed such that in combination with the plugs the tip-ring 
circuit is not shorted momentarily when the plug is inserted or withdrawn.  
Hi-fi TRS (headphone) plugs and jacks don't make that guarantee.  On a telephone 
circuit that would make a very loud pop on a live circuit and would cause a 
momentary off-hook condition in a loop start system.

Knowing that makes me feel old!

Peter


On 10/17/2013 5:16 PM, Frank Carraro wrote:
> 		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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