[ARC5] US Submarine ELINT WWII, (was British ZB......?)

[Gene Smar]

Speaking of Japan and RADARs, I’ve always thought it ironic that the APS-13 “Archie” tail warning RADAR was mated with the Yagi-Uda antenna as part of the altimeter fuze for both Little Boy and Fat Man.  

 

C’est la guerre.

 

 

73 de

Gene Smar  AD3F

 

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Tim
Sent: Wednesday, April 07, 2021 6:12 PM
To: Hubert Miller <Kargo_cult at msn.com>
Cc: To: ARC-5 <arc5 at mailman.qth.net>
Subject: [ARC5] US Submarine ELINT WWII, (was British ZB......?)

 

Hue said: But by US standards Japanese radars were rudimentary, not widely deployed, and also ( without referring to my docs ) I believe mostly operated on lower frequency bands than US. It just seems rather less likely or certainly, uncommon 

[snip]

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

Generally true.....US Subs used the AN/APR-1 (and -4 presumably) hunting IJN ships/submarines in the Pacific in WWII.  ..In researching the AN/APR-1 that I am playing with I learned that the USS Batfish sank an IJN submarine after the APR-1 detected its 150 mc radar. Those IJN subs also carried 3 Gc radars, at least late-war.  The APR-1 (SPR-1) could detect both radar band emissions. I would expect many other intercepts were made with this gear.  It was a good passive system and the APR-4 variant was used well into the Vietnam war era aboard EB-66 aircraft, probably others.

Some details if you're bored:  http://www.n6cc.com/an-apr-1-apr-4-radar-comm-surveillance-receiver/

 

Tim

N6CC

 

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