PRC1099A-MSOP 6-1
CHAPTER 6
ANTENNA SYSTEMS
Short Whip Antenna
In the manpack configuration, the PRC1099A is generally used with a short
whip antenna. It is very short compared with a resonant antenna on most
frequencies in the HF range and must be artificially matched by the antenna
tuner. The whip antenna operates against ground. In the manpack configuration,
the ground is provided by the capacitance of the operator’s body. The
combination of the short antenna, lossy ground and inefficiencies in the
matching system severely restrict the range of the equipment in the manpack
configuration. A major improvement in performance is possible by using longer
whip or wire antennas and a better ground system. For maximum ranges, the
resonant antennas provide superior performance.
Internal Antenna Tuner
The internal antenna tuner matches the 10 ft. whip antenna from 2 to 30 MHz.
The following antennas can also be matched over the 1.6 to 30 MHz frequency
range with the addition of a special long wire adapter (LWA).
Long whips
• 16 ft. (requires LWA above 15 MHz)
• 24 ft. (requires LWA above 9 MHz)
• 32 ft. (requires LWA above 6 MHz)
Long wires
• 25 ft., 50 ft. and 100 ft. (requires LWA)
The whip or long wire antennas must be connected to the special LWA. The
antenna tuner does not tune properly unless the adapter is used. The antenna
tuner matches random length long wire antennas (exceeding 50 ft.) on most
operating frequencies. In an emergency, the long wire can be attached to the top
of the support and tunes on most frequencies.
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