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

3.8 Extraneous emissions. Emissions that result from spurious tones, bands of noise, or other undesirable signals, but that exclude uplink RF harmonics and intermodulation products.

3.9 G/T. G/T is the receive antenna gain-to-noise temperature (G/T) in dBi/K. Minimum G/T is measured while operating with the transmitter 'on' in a clear-sky condition, at the lowest frequency in the band, at a 10-degree elevation

angle, and at 23 degrees Celsius.

3.10 Harmonics. A harmonic is a component frequency of the signal that is an integer multiple of the fundamental frequency.

3.11 Instantaneous bandwidth. The range over which a system's passband amplitude and phase response vs. frequency remains compliant without any tuning, where compliance is governed by the transmit phase linearity, transmit amplitude response, receive phase linearity, receive amplitude response sections in this standard.

3.12 Maximum-linear EIRP. The ET EIRP expressed in dBW at maximum-linear power as defined in 3.13.

3.13 Maximum-linear power. For terminals with a single carrier, the definition is in subparagraph a below. For a terminal capable of supporting multiple carriers, this is defined as the lesser value of subparagraphs a or b below.

a. Single carrier maximum-linear power. For a single carrier, the maximum-linear power will be defined as the carrier power where the first spectral regrowth sidelobe (measured at

1.0 symbol rate [expressed in Hz from the carrier center

frequency]) of the modulated carrier is -30 dBc.

b. Two carrier maximum-linear power. The maximum combined transmit power of two equal amplitude continuous wave (CW) carriers, when any individual intermodulation product power is -25 dB relative to the combined power of the two CW carriers

3.14 Antenna Pointing. The action taken by the antenna control system to command the antenna's electrical boresight to a certain vector without regard to the antenna control system's method of determining the vector.