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VHF COMMUNICATION


✔️📘✏️Aircraft short-range communication uses the VHF band between 118 MHz and 137 MHz to talk with air traffic control.

✔️📘✏️An aircraft VHF communications transceiver (combination of transmitter and receiver) is comprised of either a single or double conversion “Superheterodyne receiver” and an “A.M. transmitter”.

✔️📘✏️There are two types of VHF communication systems with respect to the channel spacing.

Channel spacing can be either 8.33khz or 25khz.

✔️📘✏️A modern aircraft are equipped with the system having the channel spacing of 8.33khz. which provides increased no channels.

✔️📘✏️The mode of operation is single channel simplex (S.C.S) i.e. one frequency and one antenna for both transmitter and receiver.

✔️📘✏️VHF has the advantage of being less susceptible to atmospheric noise and wider bandwidth.

✔️📘✏️The antenna can take various forms: whip, blade, or suppressed.

✔️📘✏️Blade antenna is used in modern aircraft; these may be top mounted and bottom mounted whereas whip antenna is to be found on smaller aircraft.




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