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withdrawn?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
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 <[email protected]> wrote:
> Gives new meaning to the word “spacing”
> 73 Eugene W2HX
>
> From: Jeffrey Golas <[email protected]>
> 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 <[email protected]> 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 <[email protected]>
> 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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