[GreenKeys] jack field polarity?

[W2HX]

Ok so maybe...Commercial products used TRS but Navy just used TS?


73 Eugene W2HX
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-----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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