[Milsurplus] Re: [ARC5] What did they talk to?

[Gordon White]

Since senior A.R.C. engineers went to England to discuss problems with 
the Command sets, they were obviously using them. The chief problem was 
getting off-frequency, so that's when the lock-tune idea came in. They 
would tune them on the ground and remove the tuning cable from the 
receiver so the pilot could not diddle with them in the air.

- Gordon