[Milsurplus] 800cps inverter on Craigslist in Portland

[Richard]

Well, maybe not.  One guy reported thinking the bearings were being 
ground up, disabled the generator excitation, and heard only windage and 
a bit of bearing noise.  I still think it's magnito-striction. I have 
been in high-voltage dc to ac converter stations where the transformers 
see lots of harmonics, and they scream too.  The noise is like white 
noise centered around 1600 cycles, nothing like a siren.

Richard, AA1P

On 11/16/2017 01:33 PM, arc5 at ix.netcom.com wrote:
>
> About the Screaming Mimi inverters. you know, those things were 
> designed to at a very high altitude when the air is very thin. The air 
> handlers that do all the screaming or designed to push a lot of air 
> through there to get a lot of cooling in that thin atmosphere. What 
> states things are grounded now, is it possible to do away with the 
> Screaming Meanie siren and still operate the inverter without 
> overheating it? maybe even just cover the holes with type or something?
>
>
> Sent from my Ain't Smart Phone.
>
>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20171116/6601d05f/attachment.html>