[GreenKeys] jack field polarity?

[Nick England]

How peculiar of AT&T, Western Electric, US Navy, Western Union, US Army, US
Air Force, Teletype Corp, Defense Communications Agency, Dovetron, HAL, and
a bunch of other people to not follow what some hams did…..

A ham shack is wired by the same person who will ever use it. So you can do
anything you want and it doesn’t matter. If you are responsible for
thousands of machines and thousands of operators/installers/repairers, it
is nice to decide on something and stick with it.

YMMV

On Thu, Jan 19, 2023 at 6:07 PM W2HX <w2hx at w2hx.com> wrote:

> Ok so maybe...Commercial products used TRS but Navy just used TS?
>
>
> 73 Eugene W2HX
> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>
>
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net>
> On Behalf Of Harold Hallikainen via GreenKeys
> Sent: Thursday, January 19, 2023 5:22 PM
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] jack field polarity?
>
> The TU-170 uses a TRS jack with the positive loop supply on tip, the
> keying transistor collector on ring, and ground on sleeve.
>
> Ideally, I'd like all equipment to be the same. In my DSP TU (
> https://w6iwi.org/rtty/DspTU/ ), I'm using an SSR to key the loop and an
> AC optocoupler to sense loop current. It is floating and polarity agnostic,
> just as my model 15 and 14 stuff is.
>
> Right now, I have two TRS patch boxes as shown at https://w6iwi.org/rtty/
> . One is driven by the TU-170, and the other by a loop supply. I can plug
> any piece of equipment (including the DSP TU) into either of these. Also,
> the positive end of the loop supply is on the tip of the connector.
>
> Harold
> https://w6iwi.org
>
>
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-- 
Nick England K4NYW
www.navy-radio.com
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