R-45 ??

ed sharpe esharpe at USWEST.NET
Fri Aug 31 09:52:11 EDT 2001

re- arr-7

yes  we prefer the look of a historically correct set!  OK! we indeed need
the  rest of the goodies to put back on the front then!

re the power supply! well if the best example is going to the Enola, we can
settle for the scruffy one!

thanks for the info Mike

ed sharpe
----- Original Message -----
From: Michael Hanz <AAFRadio at erols.com>
To: Old Tube Radios <boatanchors at theporch.com>
Sent: Friday, August 31, 2001 5:48 AM
Subject: Re: R-45 ??

> Ed changes reflector lists so fast I can't keep track of him.  :-)  I
> appended our previous interchange on the Tempe list for completeness.
> While I would observe that beauty is in the eye of the beholder, I would
> agree with Dennis' observations.  There was an additional impetus,
> however - the automatic clutch that allows manual tuning when the motor
> drive is not running can be fairly stiff.  There are techniques for
> reducing this drag, but most hams took off the scan motor drive and
> called it good.  Personally, I like the looks of the cam cover better
> than a gaping hole in the front panel, but that's personal preference.
> Re: the dynamotor, with a couple of rare exceptions all of the WWII ECM
> equipment used 115vac 400~ power.  Dennis mentioned the PP-32/AR power
> supply for the ARR-7 and ARR-5, used for up to three receivers (a
> curiosity since I have only heard of one installation with more than the
> two receivers above.  It was on the Great Artiste on August 6th, when it
> and No. 91 (Necessary Evil) were downloading 51MHz blast data from the
> parachute packages dropped to measure pressures on the Hiroshima
> mission.)  These power supplies are extremely rare, and I'm actually
> donating my best example for the Enola Gay installation.  Beser used the
> ARR-7 on the Hiroshima mission to monitor fighter control and ground
> communications.  The ARR-5 was used for the telemetering information
> from one of the dropped packages.
> > In a message dated 8/30/01 9:01:50 PM, esharpe at uswest.net writes:
> > >then why, if you could disengage it... did  these folk tear the thing
> > >off.... go figure.....
> W7QHO at aol.com wrote:
> > The sector cam assembly and it's dust cover on the front panel are not
> > particularly attractive.  Also, serves no useful purpose and actually
gets in
> > the way when the receiver is put to normal ham or SWL use.  For this
> > they have been removed from many of these receivers that turn up today.
> > take it this has been done to your example.
> ed sharpe wrote:
> >
> > Mike: oops! I should have said... not radar countermeasures...  I would
> > suppose since it went to 45 megs the arr7 was used for voice stuff?
> >
> > need to find the cannon plug that used to be on the front of this
> > as it was removed and some kludge Jones plug put on the back of this
> > then we will be doomed to quest
> > for the dynamotor!( need to know which dynamotor was used with this.)
> > ok looks like  the museum needs an arr5 to go along with it then.
> >
> > will keep a look out for an apa 11 for you Mike we are looking for one
> > it seems many times things will show up in pairs!
> >
> > ----- Original Message -----
> > From: Michael Hanz <AAFRadio at EROLS.COM>
> > Sent: Thursday, August 30, 2001 4:42 AM
> > Subject: Re: need to gather info on new items added to museum today!
> >
> > > ed sharpe wrote:
> > >
> > > > next item.... arr-7... this is by hallicrafters also and
> > > > has video and  panadaptor output....
> > > > which is the right  scope to add to it and why did they use the
scope on
> > > > this unit? not high enough to be countermeasures......
> > >
> > > Excuse me?  :-)  I can assure you that the ARR-7 (repackaged SX-28)
> > > its S-27/S-36 equivalent, the ARR-5, were Raven receivers, Ed.  These
> > > two were used with the third of the triumvirate, the APR-4, to feed an
> > > AN/APA-10 panoramic adapter and either an AN/APA-6 or AN/APA-11 pulse
> > > analyzer for signal detection, analysis, and characterization.  As a
> > > matter of fact, recently I've been wading through mountains of old
> > > documents and crawling around on hands and knees looking for mounting
> > > holes, trying to determine what was on board the Enola Gay on August
> > > 6th, 1945.  It appears that *all* of the above (with an APA-11 vice
> > > APA-6) were chosen by Jacob Beser from anything he wanted for that
> > > mission.  BTW, we still need an original APA-11 for the suite in Enola
> > > (not thelater -A model).  Would appreciate any leads.
> > >
> > > Mike Hanz
> > > Certified WWII airborne ECM eccentric (CWAEE)

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