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

4.2.17 Transmit spectrum inversion.  No inversion of spectrum shall exist between any IF input and the antenna output for ETs operating with a non-embedded modem(s).  Terminals with embedded modems shall be interoperable with terminals that do

not have embedded modems.

4.2.18 Input Impedance.  The input impedance shall be 50 ohms or 75 ohms, as needed, with a VSWR less than 1.5:1 over the specified bandwidth.

4.2.19  Transmit IF frequency.  An IF input interface centered at one or more of the following frequencies shall be provided, where the ± amounts represent instantaneous bandwidths that are consistent with the following phase linearity requirements of paragraph 4.2.7 and the amplitude response requirements of paragraph 4.2.8:

70 MHz ±  18 MHz

140 MHz ±  36 MHz

700 MHz ±  62.5 MHz

1,350 MHz ±  400 MHz

1,500 MHz ±  500 MHz

2,700 MHz ±  500 MHz

4.3. Reception function. The reception function shall be in accordance with 4.3.1 through 4.3.13.

4.3.1     RF frequency bands.  The down-conversion function shall be tunable in one or more of the SHF frequency bands

listed in table II.

TABLE II.  Downlink frequency requirements.

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