[ARC5] [armyradios] Re: [Vintage-Military-RADAR] 800 Hz Static Inverters

[J. Forster]

Not a bad idea. It's need a transformer to step up the output, but that's
not hard. Trandformers are small at 800 Hz. I could probably make a pretty
good one by adding a hand-wound primary to a 400 Hz Variac.

It was common in the lab to use McIntosh amps as variable frequency supplies.

-John

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



> Someone once suggested getting hold of one of those KW-Class audio amps
> used to blow the windows out of Toyota's.  Feed it with an X00 cps sine
> wave generator.  The load would be pretty "low impedance" and it might
> work
> in principle. Of course amplifier Class A operation would be very
> inefficient, maybe Class B, P-P could be an option.
>
> Conceptually, would this work?
> Tim
> N6CC
>
>
> On Fri, May 23, 2014 at 5:02 PM, 'J. Forster' jfor at quikus.com [armyradios]
> <
> armyradios at yahoogroups.com> wrote:
>
>>
>>
>> > On 5/23/2014 3:40 PM, 'J. Forster' jfor at quikus.com
>> > [Vintage-Military-RADAR] wrote:
>> >> I want to power up parts of an ASB-5 RADAR. The thing takes 800 Hz,
>> >> either
>> >> 80 or 115 VAC, Single Phase, roughly 500 - 1000 Watts.
>> >>
>> >> I've read articles on the web about modifying commercial (Asian) 60
>> Hz
>> >> units for 400 Hz. This seems a possible alternative, but the articles
>> >> referred to obsolete and unavailable converters.
>> >
>> > This is certainly a possibility, but will require some development
>> > work. It depends on how much time you have to devote to it.
>> >
>> >> Does anybody know of suitable 'true sinewave' 60 or 800 Hz inverters
>> >> that
>> >> are currently available (used OK) that have documentation available?
>> My
>> >> guess is that not only the internal clock, but also any output
>> filters,
>> >> would need modifying.
>> >
>> > Sure. Behlman makes the best, [snip]
>>
>> Mike,
>>
>> I was referring to a current, modifyable one. I know Elgar and B-I make
>> good iron, but I can't really deal with one of those at present.
>>
>> -John
>>
>> ================
>>
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