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

[Bill Strangfeld]

The ST-8000 and the ST-8000A cannot key a HV loop directly.  A HAL LP-1210 was one way to get the necessary interface.  LP-1210 manuals are online at Nick’s pages:

http://www.navy-radio.com/rtty/hal/lp1210/

Nick is correct, the LP-1210 has keying converters and loop supplies.  There are ten separate channels so it handles up to ten separate loops.  HAL sold the last few units on eBay a couple of years ago.  Mine was $25 plus shipping.  There were no other bids.  It was NOS but still was checked out by the factory and came with manuals and spare boards, even though it is built for 100,000 hours between failures.  Thanks again, good people at HAL!

There are (or were) some simple circuits online for building your own interface with opto-isolators and keying transistors.  I’ll post links if I can find them.

It might work to take RS-232 out of the ST-8000 and feed it into something like an ST-5000 which has RS-232 input and also can key a loop.  Haven’t tried that, though.

Bill W8FIX

> On Dec 4, 2020, at 1:01 PM, Nick England <navy.radio at gmail.com> wrote:
> 
> The manual says the ST-8000 is low voltage in/out only. Evidently the LP-1200 includes level converters as well as a loop supply.
> Nick 
> 
> 
>> On Fri, Dec 4, 2020 at 12:52 PM W2HX <w2hx at w2hx.com> wrote:
>> 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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