[ARC5] 400 & 800 cycle power aboard ship

[Jay Coward]

Sounds like I'll need a couple of cases of beer to placate the neigbors if I start one of these up. Having two, I'll need to start two...to make sure they both work... more beer for the neighbors...hot dogs and hamburgers too, and corn on the cob, mac salad...oh my!... and it was such a nice quiet neighborhood...and he seemed like a nice quiet guy...
 What have I gone and done?  I'm sorry Mom...
Jay ;-)



-----Original Message-----
From: Scott Johnson <scottjohnson1 at cox.net>
To: jfor <jfor at quikus.com>; 'Jim Horn' <zippypik at aol.com>
Cc: arc5 <arc5 at mailman.qth.net>
Sent: Mon, Aug 27, 2012 5:27 pm
Subject: Re: [ARC5] 400 & 800 cycle power aboard ship


The 800 Hz Navy inverters scream because at 800Hz, magnetostriction makes
he laminations vibrate profoundly.  I have one of these devils that runs my
O-9.
ven the power transformer makes a racket!
 can recall hearing the 800 Hz inverters over the engine noise standing
ear a PB4Y as it taxied by.  They truly sound like the hinges of hell!
he big Bendix 2500 and 5000 VA 400Hz inverters used on the C-130s are no
ouder than the pilots 500 VA inverter, and only slightly louder
han the 100VA co-pilots backup inverter.  
Scott W7SVJ
-----Original Message-----
rom: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
ehalf Of J. Forster
ent: Monday, August 27, 2012 4:06 PM
o: Jim Horn
c: arc5 at mailman.qth.net
ubject: Re: [ARC5] 400 & 800 cycle power aboard ship
Smallish rotary converters certainly do scream, however the lager ones, not
o much.
We had a 10 kW unit at a lab I worked in and it was really quite quiet.
he 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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