[Milsurplus] I-81-A Radio Compass Indicator

[J. Forster]

Hi Al,

I asked Breck Smith to copy me on the prints. The receiver uses 115 VAC
400 Hz; but there is a stepdown transformer and the indicator circuit runs
on 28 VAC, 400 Hz.

I thought it was 26 VAC, but I'm more familiar with the MN-26 stuff than
the ARN-7.

Best,

-John

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

> Antonio,
>
> I'm sure it's designed for 400 Hz, and I believe 115 VAC.  See:
> http://website.lineone.net/~norman.groom/SCR269.htm
>
> You might be able to get away with lower frequencies at greatly reduced
> voltage.  I know some people did so in the "old days" for ham use.
>
> Al
>
> On 11/2/2010 12:25 PM, asmagal at fc.up.pt wrote:
>> Greetings from Portugal.
>>
>> Please, send me the voltage and frequency
>> for the selsyn of the above bearing indicator.
>>
>> Thanks,
>> Antonio
>> CT1TE
>>
>>
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