[Milsurplus] RE: Early WW-II ADF

Fri, 15 Mar 2002 21:21:27 -0700

Robert, let me now if you have any extra loops or control box and cables for
arn -7  have the  black box but nothing else.

ed sharpe archivist for smecc
----- Original Message -----
From: "Robert W. Downs" <[email protected]>
To: <[email protected]>
Sent: Friday, March 15, 2002 1:00 PM
Subject: [Milsurplus] RE: Early WW-II ADF

Mike & Group,

I have a manual here dated January 1940 on a Sperry Automatic Radio
Direction Finder Mark I.  I'd say that it looks more like the BC-433 than
the Bendix sets.  Uses mostly double-ended metal octals.  Covers 200-1500
KC and has an internal vibrator supply rather than a dynamotor.  It's also
a 12 volt set, although reading between the lines, there might have been a
24 volt model.

I haven't read the entire manual carefully, but the manual seems to be
aimed at the then civil aviation market.  No mention that I see of either
the Army or the Navy.

>What was used as the radio compass set?  I think it would be too early
for the AN/ARN-6 (which was just post-WWII, I think).  I know the
pre-WWII USN used the DU and DZ DF sets, but now that you mention it,
I've not seen much info on WWII-era USN radio compass sets.

>This is in contrast to the USAAF, where the SCR-269 (BC-433) dominated,
followed by lesser use of the SCR-280 (BC-431), the MN-26, and the
late-war AN/ARN-7.

>The SCR-269 seems to be quite an advanced set for its era.  I've been
studying the manual for mine and I'm quite impressed with it
technically.
<

73
Robert Downs
<[email protected]>
Houston
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