[GreenKeys] Loop supplies/ST-6?

[W2HX]

Hey all, Just resurrecting an old post from April. I went ahead and built a project for this external loop supply, went a little overboard, but isn't that the fun of it?
I made two videos of the project if you're interested.

https://youtu.be/d-nGXodtDTs
and part 2
https://youtu.be/RUj7JqochpM

73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of W2HX
Sent: Monday, April 8, 2024 7:44 PM
To: Greenkeys <greenkeys at mailman.qth.net>
Subject: [GreenKeys] Loop supplies/ST-6?

Hi all

For many years, I've used my ST-6 as my TU with its built-in loop supply. These days as I am using a different TU for the 850 shift stuff. I still use my ST-6 but in STDBY (mark hold) mode just to have it supply loop current to the equipment as my CV-2460 expects and external loop supply (but not use the ST-6 as a TU for 850 Hz).

The number of machines on the loop has grown and therefore has been reducing the current that is able to be supplied by the ST-6 as I don't think it was meant to handle more than a few devices. I have maxed out the rheostat in the ST6 (or minimized it as is the case). So I acquired a navy loop supply, designation PP-3495A (attached) that can supply 120VDC at a full 1A output.

I was wondering if anyone has modified an ST-6 to disable its internal loop supply and allow it to be used with an external supply? This way I can use one loop supply regardless of which TU/CV I am using to drive the loop (of course, the unused TU/CV would have to be in bypass/standby/mark-hold mode).

Thanks


73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos


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