[Milsurplus] Variable Hertz AC Supply--Used For What?

[J. Forster]

There are more systems that use 80/115 VAC at 400 Hz: APN-2 (BC-929-A &
RT-1A/APN-2), ASB-5, maybe ARN-7 come to mind.

One caution: Fuse the output!

I screwed up some years ago with a different model static inverter. I'd
hooked one up to a BC-929-A and was running it. After about 5 minutes, the
indicator died, transformer leaking hot tar. It turned out, I had the unit
set for 40 Hz, not 400 and it killed the BC-929-A

-John

==================


> On 5/7/2010 3:04 PM, Don Merz wrote:
>> What good is this thing? It's an AC supply--looks to be in the 4-5 amp
>> range made by Pacific Electronic Enterprises as their model PD-250D AC
>> Power Source. Voltage seems to be variable from 0-150VAC and frequency
>> is variable from about 40hz to 500Hz. Metered. Solid construction. Solid
>> State.
>>
>> Whyforisthis? I was thinking that maybe it could be used to power 400hz
>> aircraft dynamotors. But surely their startup current would crush this
>> thing?
>>
>> Any ideas? I just want to sell it but I am not sure who would be
>> interested in it!
>>
>
> All the 400Hz inverters I'm familiar with use 28vdc, Don,  Selsyns use
> 400Hz power, but they are usually a pretty small load and don't
> represent a large startup current.  Much of the WWII 400Hz equipment I'm
> familiar with (except transmitters) present a load within that range.
> For example, here are three pieces of intercept gear:
>
> 400Hz Power requirements:
> AN/APA-10 panadapter - 140 watts
> AN/APA-11 pulse analyzer (oscilloscope) - 196 watts
> AN/APR-4  surveillance receiver - 125 watts
>
> Or, since the harmonic content may be less than that of the power line
> (at least it is with my Behlman lab inverters) you could sell it to the
> audiophiles to provide more stage presence and transparency in their
> hum.  :-)
>
> Best 73,
> Mike  KC4TOS
>
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