Comm

Question 1

Comm

Frequencies

Answer 1

HF -
2-29.999 MHz

VHF -
30-89.999 MHz

UHF -
225 - 511.999 MHz

Question 2

Comm

HF

Answer 2

AN/PRC 150

2-29.999 MHz

Long distance to CP

Over 15 k

Long waves, long range

Able to go over obstacles

Field expedient antenna for long distances

Question 3

Comm

VHF

Answer 3

30-89.999 MHz

Extends slightly beyond LOS due to diffraction or bending of the signal by the atmosphere.
At frequencies in the 30 MHz range, acts like HF ground waves.

Range of reliable communications generally no more than 50 km and often depends on the:

• power output of the radio
• terrain
• atmospheric conditions

Comm to ground troops - most widely used in infantry battalions.
Ground to ground communications.

LOS

0-15 k

Short waves

117

Question 4

Comm

UHF

Answer 4

225-511.999 MHz

Strictly LOS

Unable to bend around obstacles because UHF wavelengths are so small.

Range may extend to 500 km as long as aircraft is high enough to be within LOS.

Used for ground to air or air to air - Comm with aircraft

Shorter range

PT to aircraft

117/152

Question 5

Comm

AN/PRC 117F

Answer 5

Multi band radio with frequency hopping capability and internal Cryptographic chip.

VHF - 0-10 km
UHF LOS - 20k to LOS
UHF SatCom 22,300 miles

2 VHF antennas - 3/6 ft

UHF antenna

Question 6

Comm

AN/PRC 150

Answer 6

Only HF

Question 7

Comm

AN/PRC 152

Answer 7

200-400 m in low power setting

400m - 5k in medium power

Max range of 5-7 km unless amplified in a vehicle.

VHF

UHF