C 1, TM 11-642 . TO 16-30VRC20-5 DEPARTMENT OF THE ARMY TECHNICAL MANUAL DEPARTMENT OF THE AIR FORCE TECHNICAL ORDER RADIO SETS AN/VRC-20, AN/VRC-21, AND AN/VRC-22 C 1, TM 11-642 TO 16-80VRC20-5 TM 11-642/TO 16-30VRC20-5, 11 July 1952, is changed as follows: The title of the manual is changed to read: RADIO SETS AN/VRC-20, AN/VRC-21, AND AN/VRC-22 62.1. Antijamming Procedures (Added) When the radio sets are jammed by unwanted signals, notify the immediate superior officer promptly, and continue to operate the equipment under any condition. Make no reference to the effect of the jamming signals during transmission. Follow the procedures below until the desired sig- nal read-through is possible and communication re-established. a. Turn the TENTH MCS tuning knob (fig. 4) to the extreme counterclockwise position. This will cause the detent to release and permit con- tinuous tuning.
DesignationTM 11-642
EditionJul 1952
StatusSuperseded
Pages232
FunctionComms Signal
CollectionHistoric
Public domain (U.S. Government work)