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

paragraph shall be met under the following simultaneous conditions:

power

a. Transmitting a single carrier at maximum-linear

b. Receiving one carrier at the maximum input signal level to the LNA

(NOTE: The ET procurement documents will define the maximum input signal level and narrowest bandwidth of interest.)

4.3.10 Receive spectrum inversions. No inversion of spectrum shall exist between any RF input and the IF output of the terminal.

4.3.11 Receive signal level stability. For any setting of the receive gain (see 5.6.1) and for a constant RF flux density level, the receive function output level shall not vary more than ± 2.0 dB in any 24-hour period.

4.3.12 Antenna pointing loss. Antenna pointing loss shall not exceed 0.8 dB for systems employing antenna tracking and 1.0 dB for systems without antenna tracking. For maximum operational wind velocities, the pointing loss shall not exceed 2.0 dB for both antenna tracking and non-tracking systems. This loss shall be translated to the appropriate uplink loss in accordance with

6.9, and used as the P2 (power variations in the direction of the satellite caused by pointing losses) RSS contribution to the

EIRP stability and accuracy specification in 4.2.4.

4.3.13 Receive IF frequency. An IF output interface centered at one or more of the following frequencies shall be provided where the ± amounts represent the instantaneous bandwidths that are consistent with the following phase linearity requirements of 4.3.6 and the amplitude response requirements of 4.3.7:

a. 70 MHz ± 18 MHz b. 140 MHz ± 36 MHz

c. 700 MHz ± 62.5 MHz