VHF Communications

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