[MRCA] [Milsurplus] ARC-38 chopper issues

[J. Forster]

> The diagram on the can shows only one coil.

OK.

 they defiantly have to be some
> sort of precision system. are you saying I can run the chopper for contact
> rejuvenation on 60 cycles? did not know if that would damage what ever is
> inside them or not.

The drive frequency needs to be 400 Hz, NOT 60. (assuming it is normally
run on 400 Hz). There are 60 Hz units, but it MUST be run at the design
frequency. The thins is resonant.

 think its a contact issue but don't see how a sealed
> can will have the contacts go bad but these things have been sitting idle
> for thirty or forty years so that don't help.

The contacts likely have developed an oxide film ot something inside has
outgassed and condensed on the contacts.

 why do you think they work
> when you beat on them?

How hard? and for how long do they work? Is your supply on frequency? They
may not work if your 400 Hz is say 350 or 450 Hz. I don't know the
tolerance aqllowed.

-John

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

> Ray Fantini
>
>>>> "J. Forster" <jfor at quik.com> 10/2/2009 1:34 PM >>>
> The thing was likely made by Airpax, Bristol, Bulova/American Time
> Products or Burr-Brown.
>
> The guts of vthe thing is almost certainly a spring and mass like a
> one-legged tuning fork. The mass will likely be a magnet. Sort of like
> this:
>
>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>