[R-390] Can you please help identify this?

[larryasp]

It resembles or is an audio filter used in WW2 aircraft. Fits in series with 
the earphones and the output of the radio. It was  a passive device. It 
widened or narrowed the audio frequency width. Most hams found those very 
useful after the war for copying CW - during the war same thing in the 
aircraft, or perhaps listening to the radio beam when navigating, and of 
course to help eliminate or at least filter out some of "Jerrys" jamming. 
You could try listening with your own radio.
----- Original Message ----- 
From: <RLucch2098 at aol.com>
To: <R-390 at mailman.qth.net>
Sent: Saturday, December 18, 2004 4:03 PM
Subject: [R-390] Can you please help identify this?


> Hi All;
> I know this list in for R-390's but milcom List seems to be dead, maybe
> someone can tell me where to ask if no one here knows?
> Now, the unit:
> It would be nice to know its use & possible Part Number.
> I know the name marked is Beam-Finder.
> Seems to be an Audio filter & works nice.
> Any ideas?
> Pics:
> http://www.myradioroom.com/navybeam-finder1.jpg
> http://www.myradioroom.com/navybeam-finder3.jpg
> Tnx & 73..
> Rich WA2RQY
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