[ARC5] AN73 Antenna Coax Connector

[WA5CAB at cs.com]

OK, I finally thought to check SIG 5.  AN-73, AN-73-A, AN-74, AN-74-A and 
AN-74-B are all for use with SCR-542 and SCR-522.  AN-73-(*) covers 100-125 
MC.  AN-74-(*) covers 125-150 MC.  Described as streamlined steel tube with 
streamlined phenolic base except AN-74-B has pressed wood base.  All have 
Connector SO-153.  Replaced AN-72-(*) (adjustable length).  Replaced by 
AN-104-(*),   SIG 5 does not give lengths for any of them.  SO-153 is also used on 
Rack FT-244, p/o of the radio transmitter and receiver with no combined 
nomenclature used with SCR-542, SCR-522 and SCR-624.

In a message dated 6/7/2011 8:24:21 AM Central Daylight Time, 
aaf-radio-1 at aafradio.org writes: 
> I notice that T.O. 01-60HB-2 for the A-36-A refers to the mast only as 
> an N.A.A. antenna (North American Aviation), which is consistent with 
> speculation that it was made especially for the initial 500 aircraft 
> delivery of the A-36 for USAAC use in the European Theater.  A note on 
> the drawing says, "The antenna mast is used with the SCR-522 radio set 
> and for that reason is insulated completely from the fuselage.  Care 
> should be taken to prevent accumulation of conductive debris around its 
> base."  Only a closeup photo of the inner conductor interface will 
> confirm the theory, but all the clues point to it.
> 
> 73,
> Mike
> 
> On 6/6/2011 10:47 PM, Mike Morrow wrote:
> >Mike wrote:
> >
> >>Steve advises me that it has a 1"-26 thread on the connector.  That's
> >>the same as an SCR-522 coax connector, though the 7 foot rod antenna was
> >>not meant as a VHF antenna.
> >I wonder what the heck it went to.  It's way too long for, say, an 
> airborne
> >ADF sense antenna.
> >
> >Fred Chesson's page http://pages.cthome.net/fwc/ANTENNA.HTM identifies
> >the AN-73 as that seven-foot whip, but doesn't say what equipment is
> >associated with it.  Fred's page also lists the AN-75 as a seven-foot
> >whip for the SCR-593.
> >
> >Mike / KK5F

Robert Downs - Houston
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