[Milsurplus] Milsurplus Digest, Vol 163, Issue 34 Re; Proximity fuze spoofing & nomenclature

[Jack Sullivan]

----------------------------------------------------------------------

Message: 1
Date: Mon, 13 Nov 2017 16:22:56 -0800
From: Brooke Clarke <brooke at pacific.net>
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] U.S. Navy ECM gear in WWII?
Message-ID: <41ab3051-6a90-08f7-3f34-565f72921b73 at pacific.net>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Hi Jack:

I've recently been reading a lot of patents on the Proximity fuze, see:
http://www.prc68.com/I/ChinaLakePatents.html

As far as I can tell it takes a large signal to trigger the fuse so it would take a very high power spoof transmitter to 
effect them.

PS if you scan down the patent date column the larger the "xx year delay" number is maybe the more secret is the idea.
PPS a fuse is an electrical device and a fuze is an explosive device.

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

-------- Original Message --------
> U.S. Navy ECM gear in WWII?

Date: Sun, 12 Nov 2017 21:54:50 +0000 (UTC)
From: Jack Sullivan<wa1tej at yahoo.com>
To:"milsurplus at mailman.qth.net"  <milsurplus at mailman.qth.net>
Subject: [Milsurplus] U.S. Navy ECM gear in WWII?
Message-ID:<1489729651.608806.1510523690347 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

  I was reading about the radio proximity fuze that the U.S. developed in WWII & was used to great effect in the Battle of Okinawa as well as in Europe. As the fuze was an oscillator coupled to an antenna it radiated a low power CW electromagnetic field in the 180-220 MHz range. What caught my attention was U.S. concerns that these signals could be intercepted by the enemy & this information used to develop countermeasures against the shells. As a countermeasure, this source stated that the Navy transmitted spoof signals to confuse any enemy radio intercept activity. Despite the fact that these fuzes were declassified in 1970, I am not familiar with the equipment that might have been used to generate these spoof signals. Any one have any insights to this?
Jack

==================================================Brooke
The spoof signals in question were not intended to have any effect on the fuzes themselves but to confuse any enemy intercept activities who might then use that information to build a jammer to cover the actual frequencies being emitted by the fuzes. The spoof signals were not intended to trigger the fuzes.
To spoof is to create something that is not really there. To jam is to interfere with something that is there.
Since the primary purpose of the VT was to explode in the proximity of an enemy aircraft, I use the term fuze in its proper sense. That its triggering mechanism was electronic was secondary to its main purpose.
Jack
   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20171114/34107c9b/attachment-0001.html>