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114 Communications<br />

114.1 Discuss the following frequency bands as they apply to Navy/<strong>Marine</strong><br />

Communications.<br />

UHF Radio<br />

Military UHF radio equipment operates in the 116 to 150 MHz upper VHF<br />

frequency range and the 225 to 400 MHz military UHF radio spectrum. MAGTF<br />

UHF radio sets such as the AN/PRC-113 (see figure 2-7 on page 2-12) are<br />

capable of data communications at 16 kbps under optimal conditions. MAGTF<br />

ground and airborne UHF radios incorporate the HAVE QUICK Electronic<br />

Counter-Counter Measures capability and operate in single-channel and frequency<br />

hopping modes. The HAVE QUICK UHF radio is capable of remote operation by<br />

using the AN/ GRA-39B or HYX-57.<br />

Ultrahigh Frequency Radio Employment Considerations<br />

UHF radios are used for forward air control (FAC) ground-to-air<br />

communication. Line of sight between radios is critical for reliable<br />

communications. Significant range differences are encountered between<br />

UHF radios employed for ground-to-air and ground-to-ground<br />

communications. Greater range is achieved when employed from groundto-air<br />

because of the increased line of sight. When UHF radios are<br />

employed in the frequency hopping mode, the following operating factors<br />

must be understood for proper operation: hopset, time of day, antenna<br />

placement, and power setting.<br />

114-2

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