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

[MARK DORNEY]

“Little Boy” used a a triple mechanical time fuse, not a radar fuse. ( and yes, I have some background in the use of this type of device ). . Not sure about “ Fat Man. 


Mark D. 


“In matters of style, float with the current. In matters of Principle, stand like a rock. “.   -   Thomas Jefferson 

Sent from my iPhone

> On Apr 8, 2021, at 4:59 PM, Rich Post <kb8tad at gmail.com> wrote:
> 
> 
> Would that be the RDZ perhaps?  Heavy, gray and yes, beautifully built.  Bought one at the turn of the millennium at a swapfest and promptly passed it to the Museum of Radio & Technology where it is still  holding down the floor.
> 
> Rich KB8TAD
> 
>> On Thu, Apr 8, 2021 at 12:48 PM Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
>> On 7 Apr 2021 at 15:11, Tim wrote:
>> 
>> > 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]
>> 
>> Although SOME of their radars operated at around 3 gHz, most were lower frequencies, as I 
>> remember it.
>> 
>> I do remember reading a U.S. Army or Navy document concerning the installation of one their 
>> radars on some Japanese capital ship. It was remarked that a rather large bundle of wires 
>> were fed through a rather crude hole torched through at least one deck with no sort of 
>> grommeting to protect the wires from chafing. A very poor installation of an important bit of 
>> equipment.
>> 
>> > --------------------------------
>> > 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/
>> 
>> Very interesting, Tim. Thank  you for writing that web page
>> 
>> I believe I own at least one of all of the tuning units used in the APR series of equipment. I 
>> have an APR-1, and I also own two of those very large and very heavy Scott-built Navy 
>> receivers which use those same tuning units, and I have, for the moment, forgotten their 
>> Navy "name", RDO?....or something. They weigh at least 100 lubs and have never been 
>> used. They are truly beautifully built. Once in a while, I slide one of them out of their cabinet 
>> simply to drool over the beautiful, beautiful construction.
>> 
>> I am tempted to ship at least one of them, at my cost, to anyone who really wants one.
>> 
>> I'll never use either of them and would hate to see them go to the dump when I kick.
>> 
>> I would suppose they belong on one of those museum ships...
>> 
>> Ken W7EKB
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