[MRCG] 800Hz AC Power for Navy Radios

[Chuck]

Mark:

I am keeping an eye on this as you know.  I was reading the Manual that I 
got from Dennis at SLO and fiind that they say in the chapter on the MG set 
that is a 1000 Watt unit output !  I have a gas gen set for the TBW and when 
I get it running I can check the current draw for you and let you know.

The MG set was 110/230/60 input to a 3 Hp motor that ran the 110/800 
generator to run the TBW.  If I come up with anything else I will let you 
know.

I used the "stage plugs" st the TV station  was at for all the lighting in 
the Studio.  They are a good plug and I con't think they are being used for 
anything else than that.  We used them for Kleig Lights up to 2Kw so they 
should handle the current.  (I should have kept some! ! )

Still looking for a Leg for the set to copy so I can get it on the 
air............................

Later,

Chuck


----- Original Message ----- 
From: "Mark J. Blair" <nf6x at nf6x.net>
To: "West Coast Military Radio Collectors Group" <mrcg at mailman.qth.net>
Sent: Friday, May 10, 2013 8:43 PM
Subject: Re: [MRCG] 800Hz AC Power for Navy Radios


>
> 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/
>
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