[CQ-Contest] Load testing a 50 amp supply?

[Gerry Treas, K8GT]

Rich,

Work out the math for the resistance needed, the work out how many of 
what wattage in series/parallel is needed.  Then mount them on a good 
insulator like glass epoxy PCB without the copper, or such, I think we 
used a pice of formica.  Clean out a 5 gallon pail very thoroughly and 
fill with distilled water.  Actually, you won't need to meet the full 
wattage rating using this method.  We used this at work for some very 
beefy supplies to set the current limits on about 15 years ago and it 
worked great.  The resistor array still exists and is configured so as 
to be able to change the series and parallel combinations, and we still 
use it for all kinds of loads, (not RF, thugh)   ;^)

73, Gerry K8GT.






Rich Dailey, N8UX (2) wrote:

> Maybe just on the edge of being on topic...
>
> I just repaired (I think) a 50 amp astron rack supply.  I intend on using
> it to power two hf rigs (SO2R) and accessories.  However, I wish to 
> load it up
> to about 30 amps to check ripple and regulation without sacrificing my
> station if something is wrong.
>
> Any ideas on what I could use to load it up for a test?
>
> Tnx,
> Rich, N8UX
>
> PS - Yes, I know I'm sacrificing redundancy.  But I need to trade it
> for desk space! -hi.
>
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