[ARC5] WWII-Era VHF Command Set Frequencies and Crystal Information (plus survival radios)

[Jack Antonio]

On 11/17/2011 7:10 PM, Mike Morrow wrote:
> Sometime after WWII, 121.5 MHz was established as a standard
> emergency channel, primarily for civil air use, while 243.0 MHz
> became standard for military use.  Both of these frequencies
> are multiples of 40.5 MHz, which became the military's tactical
> low-band VHF FM emergency/guard frequency.
>

I have an R-28/ARC-5 with with an
inspection tag from NAS Norfolk Va
dated 11-23-53.

The frequencies in it are

A 121.5
B 142.74
C 126.18
D 135.9

So the change from 140.58 to 121.5 took place
prior to November 1953.

Jack Antonio WA7DIA/4