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

[Tim]

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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