Guard Channels (was [Milsurplus] RE: Nutso (RE: WW2 B-29 VHF radio?)

[jhaynes@alumni.uark.edu]

>
> I think that the standard "emergency" guard channel frequency of WWII
> was 140.58 (I erroneously said "142.58" in an earlier post.)  It appears
> Channel      Frequency
>   A           116.10
>   B           126.18
>   C           140.58
>   D           142.74

This reminds me of an old question - those peculiar numbers on the ends of
the frequencies.  Postwar the aviation band was channelized in 0.5 MHz
increments, then split to 0.25, currently split to 0.125.  What was the
scheme used in WWII that results in the numbers given above?

As for the emergency frequency, perhaps it got moved after the war.
during the war they had 100-156 MHz, but afterward the aviation band was
cut down to 108-136.