[ARC5] BC-451

[Kenneth Corwin]

Hi, Larry -

You wrote:

> ...one of [the BC-451-A's] had the frequency of 3105
> written in the transmitter number 1 position.

A common way to contact towers during and long after
WWII.  Aircraft called towers on 3105-kc, towers would
reply on LF (e.g., BUR 278-kc, LAX 272-kc).  Calling
frequency later changed to 3023.5-kc.

> ...2nd unit...had 6440 in the first transmitter
> pos. and 4220 in the 2nd...

Some towers could simplex on 4220-kc.  Victorville
(CA), for example.  Perhaps others could simplex on
6440-kc.

Source:  Los Angeles Regional Aeronautical Chart
(expires after February 4, 1943)
 
> I can't imagine trying to send CW with the key push
> thing on the top, let alone be the op trying to copy
> it on the other end of the path.
 
Agree.

Regards, Ken Corwin KF6NUR