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INSTRUMENT FLIGHT RULES WORKBOOK
CHAPTER ONE
105. VHF COMMUNICATIONS
For two-way communications with ATC ground facilities and other aircraft, the military uses
UHF and VHF band transceivers.
1. ON/OFF SWITCH ALSO CONTROLS VOLUME
2. FREQUENCY ADJUSTMENT (OUTER 10S, INNER 25 KHz)
3. MODE SELECTOR
Figure 1-7 BECKER AR4201 VHF
The VHF transceiver used in the T-34C is the Becker AR4201 with a frequency range from
118.000 to 136.975 (Figure 1-7). Spacing is 25 KHz with 460 available channels. The VHF
communications radio is the primary transceiver for the civilian sector.
106. UHF COMMUNICATIONS
The UHF radio is capable of transmitting and receiving on any one of 1750 manually selected
frequencies in the UHF band between 225.0 MHz to 399.975 MHz. Normally, they also have 20
preset frequencies and a GUARD channel which continually monitors the UHF emergency
frequency of 243.0 MHz. The UHF transceiver used in the T-34C is the AN/ARC-159V
(Figure 1-8).
INTRODUCTION TO AIRBORNE NAVIGATION AND COMMUNICATIONS
EQUIPMENT AND PRINCIPLES OF OPERATION 1-11


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