[Heath] HP-1144 PS QUESTION

[G3OOU at aol.com]

Hi John
 
I have a manual for the HP-1144A which shows the protection system in place 
 and a schematic for the HP-1144 which has no protection system.
 
73

Bob

Bob F Burns G3OOU,  G-QRP 6907, @BobFBurns
Crystal Palace Radio & Electronics Club: _www.g3oou.co.uk_ 
(http://www.g3oou.co.uk/) 
Technical web site: www.qsl.net/g3oou  

 
In a message dated 04/11/2017 18:19:32 GMT Standard Time,  
lhouseparker at livingston.net writes:

On  11/3/2017 11:59 AM, Alexander N. Gerli wrote:
> Hi, folks! I have two of  these PSs, both work fine. But they have
>  different regulator  PCBs. Both cases say HP-1144. I thought there
> was an -A version, but  which PCB did that have? My Manual shows
> the PCB with the large  screw-mounted diode. Which one is which?
> Thanks. 73,  Sandy  AC1Y


I don't know if there ever were "A" and "B" named versions,  but the 
first version of the HP-1144 did not have the "large screw-mounted  
diode". That diode was part of a field update modification kit which  
added crowbar over-voltage protection and modified the regulator  
circuitry; that large diode provides the crowbar's short to ground.
The  mod. kit manual said the PS is model 830-33, Series 00835.

Later  HP-1144's from the factory must have included those 
modifications and a  new manual, so if your manual shows the large 
3-termina_l screw-mounted  diode then you have the updated version. The 
field update kit included a  completely new PCB, regulator IC, caps & 
resistors, plus a new  manual.

If your other HP-1144 is the old version, then I have its  manual; let 
me know if you need some pages scanned. I seem to recall that  the 
older regulator IC was somewhat unreliable and is no longer  
available; whether or not the newer regulator IC is still available I  
don't know.

73
John   KE5ZB



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