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

4.3.2 Maximum power flux densities. All reception functions shall be met with the maximum power-flux densities as follows:

a. X-band:

-142 dBW /meter2 in any 4-kHz band

b. Military Ka-band:

-112 dBW/meter2 in any 1-MHz band

4.3.3 Receive chain gain and IF interface characteristics. The receive chain (see 5.6.1) (antenna interface to terminal IF interface) shall exhibit the following characteristics:

a.   The post-LNA contribution to the system noise temperature shall not exceed 0.2 dB.

b. The receive chain absolute gain shall be sufficient to raise the IF interface noise power spectral density, when pointing to a cold sky away from a geosynchronous satellite at an angle of 30 degrees, to at least -103 dBm/Hz.

c. An IF output level adjustment of at least 20 dB in steps of 1 dB or less shall be provided.

d. With two equal-power modulated carriers, with a combined level equivalent to that from the antenna when receiving the maximum power flux density at the receive chain input, any third order intermodulation product power spectral density (PSD) at

the IF output shall be at least 10 dB below the noise floor PSD.

e. The output impedance at the terminal IF interface shall be 50 ohms or 75 ohms, as needed, with a VSWR less than 1.5:1 over the specified bandwidth.

4.3.4 Tuning.  The downconversion function shall be tunable in 1.0 kHz increments, in conjunction with the modem starting at the lowest frequency for each band, as listed in table II.  The instantaneous bandwidth shall be available at any tuned downlink

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