[ARC5] Start of W.W.II New Crystal Frequency?

[Bruce MacMillan]

My US navy RBC has "planes 6970 kc" penciled in on the freq chart. Going 
by the other callsigns & freq assignment it looks to be Pacific theater 
mid to late WWII.

Also has something marked "time tick 1254 kc". Did the military xmit a 
time signal to coordinate things?

Bruce   ve7mt

brooke at pacific.net wrote:
> Hi:
>
> I've read that at the start of W.W.II the Army and Navy used different
> H.F. Frequency bands.  That led to a problem when AAF planes were
> searching for subs and needed to talk to the Navy.  So a new frequency
> that was at the band edge of both services was needed so they could
> intercommunicate.
>
> Is that correct and if so what was the magic frequency?
>
> Have Fun,
>
> Brooke Clarke, N6GCE
> http://www.PRC68.com