[GreenKeys] WU 9797 LESU Jacks TR or TS?

[W2HX]

Gives new meaning to the word “spacing”


73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos

From: Jeffrey Golas <jeffg at junknet.net>
Sent: Friday, December 2, 2022 9:33 PM
To: W2HX <w2hx at w2hx.com>
Cc: Nick England <navy.radio at gmail.com>; Greenkeys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] WU 9797 LESU Jacks TR or TS?

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
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos

From: Nick England <navy.radio at gmail.com<mailto:navy.radio at gmail.com>>
Sent: Friday, December 2, 2022 9:14 PM
To: W2HX <w2hx at w2hx.com<mailto:w2hx at w2hx.com>>
Cc: Greenkeys <greenkeys at mailman.qth.net<mailto:greenkeys at mailman.qth.net>>
Subject: Re: [GreenKeys] WU 9797 LESU Jacks TR or TS?

Use only a 2-conductor plug - tip/sleeve.
None of this new-fangled TRS stuff like on your Koss Pro/4 stereo headphones

Nick England K4NYW
www.navy-radio.com<http://www.navy-radio.com>


On Fri, Dec 2, 2022 at 8:40 PM W2HX <w2hx at w2hx.com<mailto:w2hx at w2hx.com>> wrote:
Ok, I am learning a lot about how this is connected. For 15 years this ASR just worked, I never had to worry about it so I never had to learn about how it is wired up. I have a question for those of you who are familiar with this LESU.  I have a 60mA meter (newly crafted) that works great when I plug it into my external jack field for my ST-6. Reads about 55mA sounds good to me. I then plugged in the meter into the BJ, RJ and PJ expecting to see something. However I saw zero current and the act of inserting the plug (of the meter) into PJ caused the printer to run open (and I know my meter is not open!).  Also BJ showed zero bias which I don’t think is the case.

So I got to thinking. Maybe the plug on the meter isn’t “compatible” with these jacks on the LESU. I am using what I believe to be fairly standard TRS plugs and I am using the Tip and Ring for the loop. Can anyone tell me if, perchance, the jacks in the LESU are expecting something else, perhaps Tip and Sleeve? That could explain what I’m seeing? Anyone know?
https://w2hx.com/x/TTY/43A-1%20Test%20Meter/20221202_203627.jpg


73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos

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