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2.4 Transceivers

2.4.2 Describe the purpose, correct manipulation and adjustment of the controls of commonly used aeronautical transceivers.

The aircraft's Radio Transceiver allows the pilot to communicate with the ground stations and other aircraft.



  • The above photo is of a typical King KY 197 Transceiver. It displays two radio frequencies at any one time. The left side is the active frequency and the right is the standby. The standby frequency can be changed using the frequency control knob.
  • The knob has 3 modes and two course tune knobs. The Larger changes at one MHz intervals, the smaller knob at 0.05MHz intervals and by pulling the smaller knob out and turning it changes by 0.025MHz intervals.
  • The white button switches between the active and standby frequency and the smallest knob controls volume.
  • By pulling out the smallest knob controls the squelch and used to elimanate unwanted noise and static.
  • Pilots wear a headset which has the dual purpose of noise muffling and communications. Within the earmuffs are speakers from which the pilots hear other aircraft and ground units. The boom microphone which is Voice activated (VOX) is used for the pilot to talk into. In order for the pilot to speak to other aircraft or ground units a selector switch must be pressed and held for the duration of speaking. This switch on a helicopter is found on the cyclic. Some aeroplanes also have a hand held microphone.
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