[ARC5] AN73 Antenna Coax Connector

[Mike Morrow]

>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.

That answers a host of questions.  I have manuals that describe the AN-74
as part of installations, but nothing that mentions the AN-73.  I suppose
the AN-74 must have been more common in the era of early VHF sets operating
around 142 MHz.  It also makes sense that an aircraft with an AN-73 or -74
would be improved by replacement of that mast with the AN-104 which provides
full coverage for the VHF sets of that time (100 to 156 MHz).  I've never
seen a AN-74 "in person" and I did not know what connector was at the bottom.
The AN-104 definitely uses the common SO-239, another improvement.

I thought that the plug (PL-170) for the FT-244's oddball coax connector
SO-153 was still pretty readily available.  Isn't that associated plug then
what Steve is seeking?

I like the mention of the AN-72 adjustible legnth antenna.  That must be
the nomenclature of the antenna that was to be controlled by the BC-602-A
control box for the SCR-522.  I'll bet not many were made.

I guess the "seven-foot" notation on Chesson's page with the AN-73 must be
incorrect.

Mike / KK5F