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

Rich Post kb8tad at gmail.com
Thu Apr 8 16:57:35 EDT 2021


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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