[ARC5] AN/CRC-7 and Gliders - Part 2

[Mike Morrow]

I wrote:

> The AN/CRC-7 wasn't AFAIK, available while WWII was in progress.
> In addition, it is a US Navy set, not an Army set.  That makes a
> difference.

It's also worth noting the the AN/CRC-7 electronics section (with
four tubes) is a hermetically-sealed (with solder!) unit that was
manufactured with an enclosed crystal for 140.58 MHz operation.
The crystal is wired into the base of the oscillator plate coil
in the sealed section.  Changing frequency of operation, even any
actual electronic maintenance other than changing the battery 
(which is outside the solder-sealed section) was never intended. 
The AN/CRC-7 is a unit intended for all time to be operated only
on the 140.58 MHz established at time of manufacture.

It would have been a very poor choice for glider service, even
if the US Army had these Navy sets in 1944 (which they did not).

Mike / KK5F