[Milsurplus] PU-18/A ???

[jcoward5452 at aol.com]

Ps to last message.I have some mil equipment cooling blowers that drive 
me out of the house!I think these came out of Viet Nam era helicopters 
where noise probably was not an issue.They are labeled 
HD-15/U,27.5V.Probably used in other aircraft as well.
I thought they might add some background "ambiance"!
 Jay

-----Original Message-----
From: jcoward5452 at aol.com
To: AAF-Radio-1 at cox.net; arc5 at ix.netcom.com
Cc: Milsurplus at mailman.qth.net
Sent: Sun, 8 Oct 2006 7:06 PM
Subject: Re: [Milsurplus] PU-18/A ???

Geeez! I thought you guys loved all the rotating electrical machine 
noise! My DY-17 must sound like a pussy cat compared to a "sceaming 
Mimi"! AN/ARC-5 dynamotors are down in the noise floor!
Jay

-----Original Message-----
From: AAF-Radio-1 at cox.net
To: arc5 at ix.netcom.com
Cc: Milsurplus at mailman.qth.net
Sent: Sun, 8 Oct 2006 4:49 PM
Subject: Re: [Milsurplus] PU-18/A ???

Unfortunately, it's a function of the centrifugal blower in the end of 
the inverter. It resembles the business end of a siren. Very efficient 
at moving air, but also efficient at creating an amazing level of 
acoustic irritation....

- Mike

David Stinson wrote:

>>The PU-18/a is a 28 VDC input 'screaming mimi' with an 800 Hz 115 VAC 
output.
>>
>>Wonder if you could turn the inverter with an external AC motor and
>>avoid the screaming?
>>

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