[Milsurplus] [ARC5] Question...

[Dennis Monticelli]

Ken,

You have a generator with a quasi sine wave switched mode inverter.  Yes,
they're dirty.  My museum has run that type of inverter at street
faires before and the radios have issues.

I don't think resonating a conventional power transformer is a good idea
because the circulating currents would be high and it would probably
overheat.  You have no doubt run across SOLA ferroresonant line
transformers; they are much oversized for their power rating.  I recommend
putting both differential and common mode filters on the output.

Dennis AE6C

On Sat, Oct 31, 2020 at 8:25 PM Kenneth G. Gordon <kgordon2006 at frontier.com>
wrote:

> At this point, I don't know where else to post this, so here goes:
>
> I have a "small emergency generator", 7500 watts, brand new.
>
> From my reading, I find that the output waveform is very "dirty" as it is
> some sort of "stepped" square-wave. I have not yet looked at the wave-form
> with an oscilloscope, but I am not expecting it to be very pretty.
>
> My old military generators output a nearly pure sine wave, but these
> modern beasts don't.
>
> SO....I have two heavy (about 70 lbs each) 115-115 volt isolation
> transformers. good for at least 15 amps input/output each.
>
> I propose to "tune" them to 60 Hz by connecting capacitors in such a way
> as to make them into 60 Hz tuned circuits with the idea that doing so
> should "round off" the waveforms and eliminate the harmonics.
>
> What does the collective wisdom think of this idea? Has anyone tried this?
> What was your result?
>
> Ken W7EKB
>
>
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