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

FIGURE 3. X-Band EIRP Spectral Density Mask

4.5.2 Antenna polarization, transmitting. The antenna

shall be capable of transmitting right-hand (clockwise) circular polarization (RHCP).

4.5.3 Antenna axial ratio, transmit. The axial ratio for

X-band circularly polarized beams shall be no greater than

2.0 dB over the transmit band.

4.5.4 Antenna polarization, downlink (receive). The antennas for all X-band terminal types shall be capable of receiving left-hand (counter-clockwise) circular polarization (LHCP).

4.5.5 Antenna axial ratio, receive. The X-band receive axial ratio shall be no greater than 2.0 dB.