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

[Al Klase]

Gene,

Actually, that antenna was a standard part of the APS-13, one on each 
side of the aircraft tail.

The weird part is that the bombs carried 4 APS-13's each,  They actuated 
relays that were wired in series parallel to ensure detonation near 2000 
feet, but prevent premature detonation.  So at least two radars had to 
vote to explode the bomb.

Al

On 4/7/2021 7:30 PM, Gene Smar via ARC5 wrote:
>
> 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/ 
> <http://www.n6cc.com/an-apr-1-apr-4-radar-comm-surveillance-receiver/>
>
> Tim
>
> N6CC
>
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: https://www.qsl.net/donate.html

-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20210408/646a7d8a/attachment-0001.html>