[ARC5] U.S. WW II equipment

Tue Jul 2 22:24:42 EDT 2013

The C-45/SNB/JRB aka Twin Beech used the ARN-7 or SCR-269 for the most part.  All the Beech birds I ever saw in mil service had the football on top of the rear fuselage, and the radio gear was mounted in the aft compartment not far behind the main cabin door.  And it was a load.  ARC-27 UHF, ARC-5 HF, ARN-7 et al ADF, ARN-8 marker beacon, APN-1 radio altimeter, ARN-30 VHF Omnirange nav (receiver similar to the ARC Type 12, side by side with a VOR converter in a Command Set-like rack)... what have I forgotten?  And up front was the ARN-5 and BC-733 glide slope-localizer pair.

I'd forgotten the AT-6/T-6 with the ARN-6; actually some had the ARN-7.  Must have been quite a burden.  Not all T-6s by any means even carried an ADF.  

Many and multiple type a/c were refitted with the smaller and lighter ARN-6.  C-47s might have either system.  Never saw a C-119 or C-123 with other than the ARN-6.

I stand somewhat corrected on the antenna in the nose of jets, but could swear that I have seen an ARN-6 loop installed there on some type a/c.  May have been the T-33/F-80.  

You may see photos of WW2 fighters, especially P-40s in the CBI, maybe some from the Pacific, with what look like ARN-7/SCR-269 football antennas; but I would bet that they were actually carrying the Bendix MN-26 radio compass which had a manually operated loop.  The MN-26 is somewhat smaller and less weight, and needs no inverter, but still is a big box for a fighter to lug around.

73

Mike
W4DSE

--- On Tue, 7/2/13, Sandy Blaize <ebjr37 at charter.net> wrote:

> From: Sandy Blaize <ebjr37 at charter.net>
> Subject: Re: [ARC5] U.S. WW II equipment
> To: "Mike Everette" <radiocompass at yahoo.com>, arc5 at mailman.qth.net, WA5CAB at cs.com
> Date: Tuesday, July 2, 2013, 8:32 PM
> We had them on the F-86D and F-86L
> birds.  Seems like there was one on our T6.  I
> don't remember what our C-45 twin Beech used.  The
> T-33's used them of course.  We only had a couple of
> T-birds by then.  The old C-47 used the SCR-269G or the
> ARN7.  I remembered the sense antenna "field" that was
> glued to the interior of the canopys.
> 
> 73,
> 
> Sandy W5TVW
> -----Original Message----- From: Mike Everette
> Sent: Tuesday, July 02, 2013 6:59 PM
> To: arc5 at mailman.qth.net
> ; WA5CAB at cs.com
> Subject: Re: [ARC5] U.S. WW II equipment
> 
> Most jet aircraft used the ARN-6.  One reason was that
> the football antenna on the ARN-7 and SCR-269 was not
> stressed to withstand high speed flight.
> 
> The little black part of the nose on the F-80, T-33, F-86,
> F9F, and many other early jets is the radome for the ARN-6
> loop.  Other aircraft carried the ARN-6 loop underneath
> the canopy; I suspect the F-86D was one because of the radar
> in its big nose section.  I think the F-100 carried the
> ARN-6 under the canopy as well.  Of course many other
> a/c carried the ARN-6, including the C-119, C-123, early
> C-130, C-131 (Convair 440) and some C-47 or more probably
> Navy R4D-8 "Super DC-3" types.
> 
> The giveaway for an ARN-6 system on larger a/c is a long,
> fairly low (maybe 8 inches) black faired radome about 18
> inches long if I remember right; or in a jet -- maybe even
> in some F-51s and F-82s -- a little glass dome underneath
> the canopy behind the pilot's seat.  And the sense
> antenna is built into the canopy on such a/c.
> 
> 73
> 
> Mike
> W4DSE
> 
> --- On Tue, 7/2/13, WA5CAB at cs.com <WA5CAB at cs.com>
> wrote:
> 
> > From: WA5CAB at cs.com <WA5CAB at cs.com>
> > Subject: Re: [ARC5] U.S. WW II equipment
> > To: arc5 at mailman.qth.net
> > Date: Tuesday, July 2, 2013, 12:11 PM
> > Sandy,
> > 
> > That's correct.  There may have been some MWO's
> > accomplished when the
> > nameplates were changed, as there were several years
> earlier
> > when most ATC and
> > ATC-1 became AN/ART-13.  The nomenclature change
> > probably had more to do with
> > the senior Blue Suiters trying to distance themselves
> from
> > their Ground
> > Pounder heritage than anything else.  :-)
> > AN/ARR-11 is a similar case.
> > 
> > Robert Downs - Houston
> > wa5cab dot com (Web Store)
> > MVPA 9480
> > 
> > In a message dated 07/02/2013 06:49:24 AM Central
> Daylight
> > Time,
> > ebjr37 at charter.net
> > writes:
> > > As I remember (correctly?) the ARN-7 was nothing
> more
> > than assignment of
> > > later AN number to the old SCR-269G radio compass
> > set.  The ARN-6 was a
> > > much
> > > better set and smaller and easier to work on.
> > Seems like we had ARN-6's
> > > in
> > > the F-86D interceptors.  Only thing that used
> the
> > old SCR-269G and ARN-7
> > > was
> > > our C-47 gooney bird.
> > >
> > >
> > > 73,
> > > Sandy W5TVW
> > >
> > > -----Original Message----- > From: Mike
> Everette
> > > Sent: Monday, July 01, 2013 10:12 PM
> > > To: ARC-5 List ; Roy Morgan
> > > Subject: Re: [ARC5] U.S. WW II equipment
> > >
> > > The only low plate voltage tubes in the ARN-6, as
> I
> > recall, are the 28D7.
> > > The rest are normal 12 volt filament types like
> 12SG7,
> > etc.
> > >
> > > And, the ARN-6 uses a vibrator to make high
> frequency
> > AC for the antenna
> > > and
> > > indicator selsyns.  Except it's not all that
> high;
> > maybe 130 cycles if I
> > > remember right.  It's been quite a while
> since I
> > worked on an ARN-6; but I
> > >
> > > remember that it was a darn fine radio... much
> better
> > than the ARN-7 which
> > >
> > > it replaced, despite being lower in the
> nomenclature
> > table.  And the 6 was
> > > a
> > > whole lot smaller and lighter.  Plus, it
> didn't
> > have that screamin' meenie
> > >
> > > inverter to provide 115 volts at 400 cycles to run
> the
> > receiver!
> > >
> > > 73
> > >
> > > Mike
> > > W4DSE
> > >
> >
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