[GreenKeys] Hall ST-8000 and driving / switching a loop?

[John, W9DDD]

You definitely need something between the ST8000 and a high voltage 
loop.  Have you found manuals at:

http://www.navy-radio.com/rtty/hal.htm ?

There isn't an exact LP-1200 manual.  The 1200-1 does polar output for 
those that need it and the 1210 is 10 channel, but you can get an idea 
of what is required if you can work around military spec overkill.

Dare I suggest a polar relay?  It only take a few mils to drive one of 
those.  Maybe the low voltage outputs could do that?  I didn't dig that 
far into the specs, but I'm sure somewhere in the manual it will tell 
you the max current load those low voltage outputs will tolerate.

Also there are some solid state relays that would work.  For example 
like used in the Volpe boards.



John, W9DDD

On 12/4/2020 11:49 AM, W2HX wrote:
> Hall ST-8000 and driving / switching a loop?
>
> Steve, as long as there is one current supply somewhere in the loop 
> you just connect up everything in series. I don’t have my 8000 in 
> front of me but if you need more help, I can dig it out.
>
> 73 Eugene W2HX
>
> *From:* greenkeys-bounces at mailman.qth.net 
> <greenkeys-bounces at mailman.qth.net> *On Behalf Of *highpwr at bellsouth.net
> *Sent:* Thursday, December 3, 2020 10:48 PM
> *To:* GreenKeys at mailman.qth.net
> *Subject:* [GreenKeys] Hall ST-8000 and driving / switching a loop?
>
> Using a HAL ST-8000 here for my RTTY ops, question since I don’t have 
> the HAL mentioned LP1200 how would I drive say a Model 28 printer 
> (which I believe has a loop supply built in) or something like a 
> Kleinschmidt TT-76 which also has a loop supply.
>
> In other words if I have a loop supply how do I switch / control it 
> with the HAL St-8000.
>
> Thanks,
>
> Steve
>
> KM4V
>
>
>
>
>
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