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

[Al Klase]

Gang,

I recalled that I did a poster on this 
<http://www.ar88.net/stuff/FUZING%20THE%20BOMB.pdf>for the 75th 
anniversary back in 2015.  Out Museum is located at Camp Evans which was 
the home of Army Radar.

Al

On 4/8/2021 12:01 AM, Al Klase wrote:
> 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
>>
>>
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>
> -- 
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net
>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net

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