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

5.3.4 RF reception radiation wave function (downlink). The

ET reception function shall conform to the following requirements when the maximum power-flux density is -115 dBW/meter2 in any 1-MHz band.

5.3.4.1 Antenna polarization. The downlink antenna shall be able to receive linear (vertical and horizontal) and circular (right-hand and left-hand) simultaneously. The earth terminal shall be capable of matching the satellite polarization angle to within 1-degree (clear sky).

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

5.4 Commercial Ku-band antennas.

5.4.1 Antenna sidelobe levels transmit. The terminal antenna and RF performance shall be in accordance with the mandatory requirements of IESS-601 or the performance standards established in 47CFR Part 25, as appropriate for the anticipated class of terminal operation.

5.4.2 Antenna polarization, transmit. The antenna shall be able to transmit horizontal linear and vertical linear polarizations; one polarization at a time. The ET feed(s) shall be adjustable to match the satellite polarization angle to

within 1-degree (clear sky).

5.4.3 Antenna axial ratio, transmit. The axial ratio of transmission for linearly polarized beams shall be as described below:

a. Antenna with diameter larger than 2.5 meters. The voltage axial ratio of transmission in the direction of the satellite shall exceed 31.6 (30.0 dB polarization discrimination).

b. Antenna with diameter 2.5 meters or smaller. The voltage axial ratio of transmission in the direction of the satellite shall exceed 20.0 (26.0 dB polarization isolation).

5.4.4 RF reception radiation wave function, downlink. The ET reception function shall conform to the following paragraphs when the maximum power-flux density is as follows (see 47 CFR,