[MRCG] 800Hz AC Power for Navy Radios

[Mark J. Blair]

On May 10, 2013, at 15:45 , Mark J. Blair <nf6x at nf6x.net> wrote:
> On May 10, 2013, at 14:17 , "Thekan, Paul" <Paul.Thekan at cpii.com> wrote:
>> Looks like you'll have to create the 'standard' for the 120vac 800hz connector.
> 
> What do y'all think about these?
> 
> https://dl.dropboxusercontent.com/u/29876211/StagePin.png


I found more information on them on Wikipedia:

  http://en.wikipedia.org/wiki/Stage_pin_connector

Their intended purpose is for dimmable lighting loads in theatrical settings. I kind of like the clunky look of them, and they're cheap and available from eBay, McMaster-Carr, etc. I have a couple pairs of them on the way from McMaster-Carr to play with.

I've had some questions about the inverter I'm going to try to hack up. I ordered this one:

  http://www.amazon.com/Power-Bright-1000-Watt-Inverter-110-Volt/dp/B002EA006S/

I'm gambling that I'll be able to figure its innards out and modify it for 800 Hz operation, without letting out the magic smoke. I asked Ray Poularas (who told me about his success modifying swap-meet UPSes for 400 or 800 Hz output), and he had this to say?


Ray wrote:
> The inverter looks like a good candidate, Pure sign way normally means
> it should have a oscillator that drive the sign wave generator, so you
> should be able to change frequency.
> 
> Things to look out for are the toroid's  and saturation, could blow the
> transistors if there is too much current drain due to saturation, a
> resistor across the inputs will broaden the bandwidth, lower efficacy but
> should fix the problem.



My hunch is that it generates the sine wave by pulse-width modulation, with some filtering low-pass out the switching frequency.



-- 
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/