[ARC5] [Milsurplus] Radio on the Frontlines: WWI and WWII | DPLA

[Hubert Miller]

Germany in the 1930s on had a limited supply of quartz. That didn't hobble their military communications; they compensated for this 
with mechanical precision. I would say quartz frequency control didn't really become a requirement until most communications 
migrated to VHF.
-Hue

>I don't know where I read it, but I read that the use of crystals to control the transmitter's exact frequency (hence, you could have a
radio "channel") was what made radio go from an option for battlefield communications to a tactical advantage and communications
necessity. Someone please correct me if I am wrong, but I believe that was in the 1930's for military communications.
73, Gordon KJ6IKT