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

the antenna feed shall be within 1 kHz of the intended value. The carrier frequency accuracy shall be maintained for the maximum mission duration without calibration."

B.4 Receive conversion frequency accuracy.  The following replaces 4.3.5 (Receive conversion frequency accuracy).

"4.3.5 Receive conversion frequency accuracy. The downconversion frequency accuracy shall be within 1 kHz of the intended value for all received carriers. Downconversion frequency accuracy shall be maintained for the maximum mission duration without calibration.

B.5 Antenna pointing loss.  Section 4.3.12 (Antenna pointing loss) shall be replaced with the following:

n4.3.12 Antenna pointing loss.  The downlink loss due to antenna pointing error shall be less than or equal to 0.8 dB 95% of the time relative to the perfectly pointed case.  The 95%

loss shall be translated to the appropriate uplink loss, 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 section 4.2.4.  The antenna pointing loss requirement is applicable for operation flight conditions, with no airframe blockage or keyhole events.

A mechanism shall be provided to inhibit transmission in the

event the antenna transmit pointing  error causes the off axis

ESD limit to be exceeded."

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