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

intended value for all RF carriers. The carrier frequency accuracy shall be maintained for a 90-day period or more without recalibration.

4.2.6 Carrier power control accuracy, step size and range. The absolute accuracy of the carrier power control attenuator(s) shall be within 1 dB of the selected attenuator value.  The relative accuracy associated with the smallest step increment shall be within 0.1 dB.  The minimum step size shall not exceed

0.25 dB. The minimum carrier power control range shall be

sufficient to attenuate the signal from maximum linear EIRP to

60 dBm as given by the following equation:

Min Range (dB) = Maximum-linear EIRP (dBm) - 60 (dBm)

The power control range can be met using the combination of the terminal and modem power adjustment.  When a carrier power change is initiated, the controlled carrier's power shall transition monotonically and shall not induce burst errors into the controlled carrier's bit stream or into the adjacent carrier's bit stream (adjacent carrier spaced at 1.2 Rs).

4.2.7 Transmit phase linearity.  Departure from phase linearity of the transmission function, when operating at any point up to the maximum-linear power, shall not exceed the following:

±  0.2 radians or less over any 2-MHz of instantaneous bandwidth.

±  0.4 radians over any 36-MHz of instantaneous bandwidth

±  0.5 radians over any 72-MHz of instantaneous bandwidth

±  0.6 radians over any 90-MHz of instantaneous bandwidth

±  0.7 radians over any 120-MHz of instantaneous bandwidth

4.2.8 Transmit amplitude response.  Amplitude variations of the transmission (uplink) function at the input to the antenna feed, when operating at the maximum-linear power, shall not exceed the following:

±  0.5 dB over any 10 MHz of instantaneous bandwidth

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