[GreenKeys] Loop supplies/ST-6?

[Jeff G]

I just took my ST-6 to field day last week...still working OK despite it
getting jostled around (I do check the cards from time to time).

I also noted how awesome it is for not printing a bunch of gibberish on no
signal, unlike certain other military-esque converters ;-)

(and then noticed how much of a PITA it is trying to tune in a RTTY station
with how sharp the filters are)

Jeff

On Tue, Jun 25, 2024 at 5:45 PM W2HX <w2hx at w2hx.com> wrote:

> 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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