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

referred to the main-lobe axis

De = equivalent antenna diameter, and

A = wavelength (same units as De, computed from 8400

MHz as reference frequency)

b. EIRP Spectral Density (ESD). For all terminals, ESD in the GSO plane shall not exceed the following:

ESD(0) = 2.351 - 25 log10 0 (dBWIHz) for 2.0° � 0 < 3.8°

ESD(0) = -13.0 (dBWIHz) for 0 = 3.8°

ESD(0) = 1.49 - 25 log10 0 (dBWIHz) for 3.8° <0 < 5.0° ESD(0) = -3.97 - 25 log10 0 (dBWIHz) for 5.0° � 0 < 6.94° ESD(0) = -25.0 (dBWIHz) for 6.94° � 0 � 12.42°

ESD(0) =2.35 - 25 log10 0 (dBWIHz) for 12.42° <0 < 48.0°

ESD(0) = -39.65 (dBWIHz) for 48° � 0 � 180°

where symbols are defined above.

The ESD requirement shall be met while incorporating transmit RMS pointing errors. The figure 3 below illustrates the mask defined by the above parameters: