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Subject: Re: COMSEC Folder
From: reginal..._at_hotmail.com
To: TSCM-L Professionals List <TSCM-..._at_googlegroups.com>
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James,
I enjoyed the Tempest article. An interesting website.
An early attempt to reduce the Tempest type problem was the SLR
receiver built by the E.H. Scott Radio Labs Inc. during and after WW
II. It is a large boatanchor built for the US Navy and shows up on
ebay quite often. I believe that the case is virtually watertight. I
am not sure but it may have also used an internal faraday cage type of
construction. The following is a partial account given on the Western
Historic Radio Museum site.
"During WW I, Scott Radio Laboratories was contracted to design and
build a type of military marine entertainment receiver that had a very
low Local Oscillator radiation or leakage to the antenna system. Scott
advertising at the time indicated that the Navy was concerned with the
possibility that enemy submarines could tune in a superhetrodyne
receiver LO signal and determine a ship's position with direction
finding equipment. The Scott ads stated that enemy DF equipment was
sensitive enough to detect LO signals up to 100 miles away. While this
all may have been true, any radio receiver used onboard ship has to
operate in the presence of many other receivers, transmitters and
radar equipment also in use on the ship. None of the receivers can
cause interference with ship equipment and must be able to perform its
function without interference from other ship equipment. The 'Scott
Low Radiation' Receiver, or SLR, was built to operate in such a
shipboard environment with no interference. It tuned the standard AM
Broadcast band and two Bandspreaded shortwave bands. The SLR receivers
were designed as a stand-alone receiver capable of high quality
reception and a wide range of audio reproduction via its push-pull 6V6
output stage. ....."
Reg Curtis
.......................................
On Apr 24, 9:28=A0am, "James M. Atkinson" <j..._at_tscm.com> wrote:
> Enjoy,
>
> http://www.tscm.com/COMSEC.Issues/tempest.pdf
>
> http://www.tscm.com/COMSEC.Issues/
>
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>From - Sat Mar 02 00:57:27 2024
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Date: Thu, 24 Apr 2008 11:12:20 -0400
To: TSCM-L2006_at_googlegroups.com
From: John Young <j..._at_pipeline.com>
Subject: Re: [TSCM-L] {2593} COMSEC Folder
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Most informative collection.
We've filed an FOIA request for the redacted portions of the
Tempest doc. What is seismic and flooding Tempest?
At 10:28 AM 4/24/2008 -0400, you wrote:
>
>http://www.tscm.com/COMSEC.Issues/tempest.pdf
>
>http://www.tscm.com/COMSEC.Issues/
Received on Sat Mar 02 2024 - 00:57:27 CST