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

Chapter1, Subchapter B, Part 25, Subpart C, 25.208 Power flux density limits):

-150.0 dBW/meter2 in any 4-kHz band where 0° � 0 � 5°

-147.5 dBW/meter2 in any 4-kHz band where 5° < 0 � 25°

-140.0 dBW/meter2 in any 4-kHz band where 25° < 0 � 90°

5.4.4.1 Antenna polarization, downlink, receive. Antenna shall be able to receive horizontal linear and vertical linear polarizations; one polarization at a time. The ET shall be adjustable to match the satellite polarization angle to within

1-degree (clear sky).

5.4.4.2 Antenna axial ratio. Receive ET antennas shall comply with the axial requirements in 5.3.3.

5.5 Phase perturbation. The transmission function shall not change the linear phase of the output RF signal by more than

20 degrees in 0.2 seconds and the receive function shall not change the linear phase of the input RF signal by more than

20-degrees in 0.2-seconds, each under the following conditions:

a. Exposure to temperature shock from a nominal 23oC. The temperature range shall include the lowest and highest Transmission Function operating temperatures. Temperature rate of change between extremes shall be 22oC per hour.

b. Vibration with an input frequency varied between 50 and

2000 Hz with a constant input acceleration of 1.5 gravitational force (peak).

c. A shock caused by the impact of a test hammer on the outside surface of the equipment housing the conversion circuitry simulating a maintenance or operator action on the transmission function subsystem. The test hammer shall be a 1-pound (453.59-grams) weight attached to an

8-inch (20.32-centimeter (cm)) arm pivoted from a rigid support and free to move through a vertical plane. The striking face shall be covered with a 0.5-inch (1.27-cm) thickness of SAE AMS 3198K1 sponge, Chloroprene (CR) rubber, medium stiffness, or other open-cell sponge

1 SAE AMS 3198K sponge, chloroprene (CR) rubber, medium stiffness, in 1/2 inch thick sheets complies with the requirements of c(1) and c(2).