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

c. Connect the antenna and allow the GPS receiver to warm up for at least 1 hour, then re-measure the stability of the external frequency reference that is global positioning system dependent.

d. Under full vibration, temperature shock, and shock caused by hammer impact (see 5.5).

4.7 System implementation loss. Total implementation loss shall be less than 2.0 dB for all modem operational parameters measured when operating in satellite loopback. The reference used to determine implementation loss is the theoretical modem Eb/NO performance using a MIL-STD-188-165A certified modem with QPSK rate � CEVD with randomizer and differential encoding/decoding on. Implementation loss includes the effects of traversing the terminal uplink and downlink equipment as well as the satellite. This shall be tested at low, mid, and high operational data rates.