[GreenKeys] WU 9797 LESU Jacks TR or TS?

[Bruce Gentry]

The manual was probably written well over 50 years ago, when people were 
expected to take responsibility for the consequences of their improper 
use of equipment. I wonder if the US military would ever allow that sort 
of situation to occur today. Is the shorting contact in the LPG 
carefully adjusted so it will reliably make up and keep the loop closed 
as the plug is being inserted or withdrawn? Is it recommended practise 
to grasp the plug firmly and insert  or withdraw it  briskly to minimize 
or eliminate interrupting the loop? I  am in the process of designing 
and building a multiple loop supply and patch bay, so these comments are 
of interest.

     Bruce Gentry, KA2IVY

On 12/3/22 7:46, Nick England wrote:
> From the manual-
> /*
> */
> /*"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!"*/
>
> On Fri, Dec 2, 2022 at 9:46 PM W2HX <w2hx at w2hx.com 
> <mailto:w2hx at w2hx.com>> wrote:
> > Gives new meaning to the word “spacing”
> > 73 Eugene W2HX
> >
> > From: Jeffrey Golas <jeffg at junknet.net <mailto:jeffg at junknet.net>>
> > Speaking from enlightening experience, no safety involved ;-) Silly 
> me plugged in a loop the other day, and for a split second I was part 
> of the loop.
> >
> > Jeff KC3GJX
> >
> > On Dec 2, 2022, at 9:28 PM, W2HX <w2hx at w2hx.com 
> <mailto:w2hx at w2hx.com>> wrote:
> > Aaah ok. That probably explains things. For some reason I had it in 
> my head that the TRS were used to provide some measure of safety where 
> the sleeves weren’t used. That is how I did my jack field but now I 
> know better. Thanks!
> > 73 Eugene W2HX
> >
> > From: Nick England <navy.radio at gmail.com <mailto:navy.radio at gmail.com>>
> > Use only a 2-conductor plug - tip/sleeve.
> > None of this new-fangled TRS stuff like on your Koss Pro/4 stereo 
> headphones
> > Nick K4NYW
>
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