IF and associated interface requirements applicable to Satellite Communications SATCOM Earth Terminals ET operating over military X-band and Ka-band Super High Frequency SHF channels. Military unique requirements for ET that may operate over commercial C-band, Ku-band, and Ka-band are included. Equipment developers may exceed the requirements herein to satisfy specific program requirements, provided that interoperability is maintained. Thus, incorporating additional standard and nonstandard capabilities and interfaces is not precluded. Existing SHF SATCOM terminals need not conform to this MIL-STD unless they undergo a modernization program.

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MIL-STD-188-164B

d. Linear polarized antennas with diameter 4.5 meters or smaller. The voltage axial ratio of transmission in the direction of the satellite shall exceed 22.4 (27.0 dB polarization discrimination).

5.2.4 RF reception radiation wave function (downlink). The

ET reception function shall conform to the following requirements when the maximum power-flux density is as follows (see 47 CFR, Chapter1, Subchapter B, Part 25, Subpart C, 25.208

Power flux density limits):

-152.0 dBW/meter2 in any 4-kHz band where 0° � 0 � 5°

-149.5 dBW/meter2 in any 4-kHz band where 5° < 0 � 25°

-142.0 dBW/meter2 in any 4-kHz band where 25° < 0 � 90°

Theta is equal to elevation angle of the earth terminal.

5.2.4.1 Antenna polarization, downlink (receive). The downlink antennas shall be able to receive linear (horizontal and vertical) and circular (right-hand and left-hand) polarization simultaneously. The ET linear feed(s) shall be adjustable to match the satellite polarization angle to within

1-degree (clear sky).

5.2.4.2 Antenna axial ratio. Receive ET antennas shall comply with the axial ratio requirements in 5.2.3.

5.3 Commercial Ka-band antennas.

5.3.1 Antenna sidelobe levels. The terminal antenna and RF performance shall be in accordance with the mandatory requirements established in 47CFR Part 25, as appropriate for

the anticipated class of terminal operation.

5.3.2 Antenna polarization, transmitting. The antenna shall be able to transmit linear (horizontal and vertical) and circular (right-hand and left-hand) polarization; however, the antenna shall not be required to transmit linear and circular polarizations at the same time. The ET linear feed shall be adjustable to match the satellite polarization angle to within

1-degree (clear sky).

5.3.3 Antenna axial ratio. There are no military unique requirements for commercial Ka-band antennas.