[ARC5] 400 & 800 cycle power aboard ship

[Scott Johnson]

The 800 Hz Navy inverters scream because at 800Hz, magnetostriction makes
the laminations vibrate profoundly.  I have one of these devils that runs my
GO-9.
Even the power transformer makes a racket!
I can recall hearing the 800 Hz inverters over the engine noise standing
near a PB4Y as it taxied by.  They truly sound like the hinges of hell!
The big Bendix 2500 and 5000 VA 400Hz inverters used on the C-130s are no
louder than the pilots 500 VA inverter, and only slightly louder
Than the 100VA co-pilots backup inverter.  

Scott W7SVJ

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of J. Forster
Sent: Monday, August 27, 2012 4:06 PM
To: Jim Horn
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] 400 & 800 cycle power aboard ship

Smallish rotary converters certainly do scream, however the lager ones, not
so much.

We had a 10 kW unit at a lab I worked in and it was really quite quiet.
The generator part was a many pole-pair machine, belt driven.

It was probably quiet because it didn't spin very fast.

-John

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


>
>
>
>
> Mike Everette wrote:< "A lot of 400 cycle powered gear was used aboard 
> USN ships during WW2. >
>
>
> The shipboard equivalent of the GP series of transmitters is the TCE 
> series.  It is slightly larger and uses steel for the chassis & covers.
> The surprising thing is that the TCE also requires 600 to 800 cycle 
> power (in addition to 28 volts DC).
> Go figure.
> My memory says that the preliminary GP-7 manual indicated that the 800 
> cycle power source was an 800-1 inverter.  These inverters were 
> reputed to be at least as good sirens as they were inverters.
> Jim Horn
>
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