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

TABLE I. Transmit uplink frequency bands.

SHF FREQUENCY BAND	FREQUENCY (GHz)
C-band	5.850 to 6.650
X-band	7.900 to 8.400
Ku-band	13.750 to 14.500
Commercial Ka-band	27.500 to 30.000
Military Ka-band	30.000 to 31.000

4.2.3 Tuning. The upconversion function shall be tunable in 1.0-kHz increments, in conjunction with the modem, starting at the lowest frequency for each band, as listed in table I. The instantaneous bandwidth shall be available at any tuned uplink frequency in 4.2.2, as long as the instantaneous bandwidth does not extend beyond the band edges.

4.2.4 EIRP stability and accuracy. For any setting of the transmit gain (see 5.6.1) and a constant IF input level, the EIRP in the direction of the satellite shall not vary more than

2.5 dB peak to peak in any 24-hour period. This tolerance,

added on a root-sum-square (RSS) basis, includes all ET factors contributing to the EIRP variation, including output power level

instability and power variations due to pointing losses. See

6.7 through 6.9 for RSS theory and determination of power variations due to pointing losses.

where

The formula for RSS error is

1 + p2

P1 = transmit function output power level instability in dB

P2 = uplink power variations, in dB, in the direction of the satellite caused by pointing losses as

described in 4.3.12 and 6.9

This does not include adverse weather conditions or any other effects not controlled by the ET. For dual-band simultaneous operation, the variable P2 shall be evaluated in the highest operational RF band.

4.2.5 Carrier frequency accuracy. The carrier frequency accuracy at the antenna feed shall be within 1-kHz of the