3-20 CALIBRATE. Select the signal of a transmitter which is
operating in the area on an authorized known frequency. If
possible, select a frequency close to the usual receiver
frequency. Verify proper operation of the receiver CAL ADJ
control and CAL function (para. 2-7b).
3-21 TEST. Test the radio receiver with the rest of the receiving
set as described in section XI of this chapter.
Section VIII. MAINTENANCE OF HEADSET, MICROPHONE,
AND AUDIO CORDS
Inspect the headset, microphone, and
telephone plug cord for broken or damaged parts or wires. Pay
particular attention to wire strain points.
The fumes of trichloroethane are toxic.
Provide complete ventilation whenever used.
DO NOT USE NEAR AN OPEN FLAME.