[ARC5] [Milsurplus] Interesting ARC-3

[jeepp]

Particularly interesting.  A lot, arguably tens of thousands, of xtals went obsolete when the RTCA and ARINC first instituted 100 kHz VHF comm channel spacing.  I remember that the USAF tower common freq.  in the 40s and 50s was 126.18.  Some of these old channels "dropped in" to the new sequence, but most did not.  ARC-1 and ARC-3 xtals don't make it.  Maybe the HC-6 type xtals for the ARC-49 do?   I expect so.  While at Page Airways, I picked up a longtime-shelved PanAm 50 channel ARC-1.  Never seen/had one since.Jeep K3HVG


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-------- Original message --------
From: Jim Haynes <jhhaynes at earthlink.net> 
Date: 11/26/17  14:30  (GMT-05:00) 
To: Ed# via ARC5 <arc5 at mailman.qth.net> 
Cc: kk5f at arrl.net, milsurplus at mailman.qth.net 
Subject: Re: [ARC5] [Milsurplus]  Interesting ARC-3 

On Sun, 26 Nov 2017, Ed# via ARC5 wrote:

> Oddly enough  we had  ARC-3 units as  backup   VHF tower com. and

When I was at Edwards AFB 1960-1963 we had a number of ARC-3 sets with
contractor-made AC power supplies as our main VHF capability.  It was
my understanding that at the time the military was prohibited from buying
any new VHF equipment as a way to force the transition from VHF to UHF
for military users.

We needed a lot of VHF because we had a lot of civilian contractors
operating out of the base and they had to use VHF for their airplanes.

There was also a mission of some nature that required flying around Europe
from time to time.  I was in the frequency manager's office.  We had a
suitcase full of ARC-3 crystals that we would issue to the airplane that
was going to fly that mission; and it was equipped with ARC-3s for that
reason.  I assume some poor radio operator had to sit there and swap
crystals in-flight to effect frequency changes required by the European
air traffic control system.

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