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
Ok so maybe...Commercial products used TRS but Navy just used TS?
73 Eugene W2HX
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-----Original Message-----
From: greenkeys-bounces@mailman.qth.net <greenkeys-bounces@mailman.qth.net> On Behalf Of Harold Hallikainen via GreenKeys
Sent: Thursday, January 19, 2023 5:22 PM
To: greenkeys@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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