MIL-STD-188-164 Interoperability Of Shf Satellite Communications TerminalsThis standard establishes mandatory Radio Frequency/Intermediate Frequency RF/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 APPENDIX B

Air-Based SATCOM OTM

B.1 Scope.  This appendix applies to air-based SATCOM systems that operate while on-the-move.  It is a mandatory part of the standard.  The information contained herein may replace specific requirements in the body of the standard (see 1.1).

B.2 EIRP stability and accuracy.

The following replaces 4.2.4 (EIRP stability and accuracy) when a terminal's modulated signal occupies the entire bandwidth of the transponder.

"4.2.4 EIRP stability and accuracy.  For any setting of the transmit gain and a constant IF input level, the EIRP in the direction of the satellite shall not vary more than 3.5 dB peak to peak in any 24-hour period.  This tolerance, added on an RSS basis, includes all ET factors contributing to the EIRP variation, including output power level instability (including radome insertion loss variations with look angle) 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 the direction of the satellite caused by pointing losses

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."

B.3 Carrier frequency accuracy.  The following replaces

4.2.5 (Carrier frequency accuracy).

"4.2.5 Carrier frequency accuracy The carrier frequency at

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