TABLE 3 (continued) System 5 System 6 System 7 System 8 System 9 Characteristics Units 8 MHz 12 MHz 16 MHz 25 MHz 42 MHz Frequency range MHz 6-9 11-14 14-18 24-27 40-44 Average power into 30 W antenna (= peak power) 7 per antenna Pulse widths No pulse Maximum duty cycle Continuous wave rise/fall time Continuous wave Transmitter tuning Digital (DDS) method Receiver tuning method Digital (DDS) Output device Solid state, bipolar (Class AB operation) Transmitter stability ppm 0.1/year Receiver stability ppm 0.1/year Transmit antenna Directional pattern type > 90% energy within ±60° beamwidth Transmit antenna type 4 vertical monopole rectangular array 0.5 × 0.15 wavelength Antenna polarization Vertical Antenna main beam 5 to 8 dBi gain Transmit antenna degrees 25 to 35 elevation beamwidth Transmit antenna degrees 120 azimuthal beamwidth
TABLE 3 (continued) Characteristics Units System 5 8 MHz System 6 12 MHz System 7 16 MHz System 8 25 MHz System 9 42 MHz Frequency range MHz 6-9 11-14 14-18 24-27 40-44 Average power into antenna (= peak power) W 30 7 per antenna Pulse widths No pulse Maximum duty cycle Continuous wave rise/fall time Continuous wave Transmitter tuning method Digital (DDS) Receiver tuning method Digital (DDS) Output device Solid state, bipolar (Class AB operation) Transmitter stability ppm 0.1/year Receiver stability ppm 0.1/year Transmit antenna pattern type Directional > 90% energy within ±60° beamwidth Transmit antenna type 4 vertical monopole rectangular array 0.5 × 0.15 wavelength Antenna polarization Vertical Antenna main beam gain dBi 5 to 8 Transmit antenna elevation beamwidth degrees 25 to 35 Transmit antenna azimuthal beamwidth degrees 120
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