[GreenKeys] Loop supplies/ST-6?

[Jim Pruitt]

Eugene,

The DT600 was an updated version of the ST6.  It did not include an 
internal loop supply but you could provide an external supply if 
needed/wanted.  I suspect that you could do the same with the ST6.

Thank you.

Jim Pruitt
WA7DUY

On 4/8/2024 4:44 PM, W2HX wrote:
>
> 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 
> <https://www.youtube.com/@w2hx/videos>
>
>
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