[GreenKeys] HAL 1200A Loop power supply

[Bill Henry]

Tom - and the Greenkeys gang:

HAL loop supplies are all special order products, manufactured to 
order.  The LP-1200, LP-1200A, LP-1201, and LP-1203 are sold primarily to 
export customers, very few to customers in the U.S.  I think you will have 
a hard time finding one of these on the loose.  The LP-1210 may be an 
exception as it is a MIL product and was sold only to the US military 
(1989-1991).  This might show up in surplus sales.  This is a nice unit but 
may be overkill for Greenkeyers as it has ten channels of MIL-188 to 20 mA 
or 60 mA neutral loop (120V).  Just invert RS-232 to get MIL-188.  It has 
an MTBF of 100,000 hours and is in a 7" high rack cabinet.

The other suggestions of using the loop power supply in a ST-5, ST-6, or 
ST-5000 will work fine.  Also note that the RS-2100 RTTY Scope also 
included a loop power supply.  You may also want to check the Fall, 2001 
issue of "The New RTTY Journal" (Vol 49, No. 3, p. 7).  I described a very 
simple 120V, 60 mA supply that uses back-to-back filament 
transformers.  Contact Wayne Matlock at <K7wm at arrl.net> to get CD ROMs of 
the back issues of RJ.

Bill Henry
K9GWT


At 08:30 AM 3/7/2008 -0800, Tom Cusack wrote:
>Hello to all and a big thank you to everyone helping me locate a 28ASR.
>(Still trying to find one on the West Coast)
>
>I recently obtained a HAL ST8000 and am now looking for a LP1200A Loop Power
>Supply.
>
>Any help in this new quest is appreciated.
>
>Thanks,
>
>Tom Cusack
>
>WA6CME
>
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