MIL-PRF-49118B(CR)
detected between the power amplifier and coupler stagers exceeds 5.5 to 1 and inhibited when
the VSWR remains less than 2.5 to 1 (see 4.5.29).
3.5.30 Operational inspection. Perform the operational test specified in 4.5.30 in order to
ascertain that the Radio Set is completely operable prior to preparation for delivery.
3.5.31 Interchangeability. Like units of radio sets, assemblies, subassemblies, modules and
replaceable components shall be mechanically and electrically interchangeable without
modification of such items or the radio set as determined by the tests in 4.5.31 for mechanical
and electrical interchangeability (4.5.31.1 and 4.5.31.2). Exception is made to electrical retuning
and realignment of modules during production assembly operations. Such retuning may be
expected as part of the assembly procedure and is permissible.
3.5.32 Electromagnetic interference. The radio set shall comply with the EMI
requirements set forth in Appendix A.
3.5.33 Visual and mechanical. The radio set shall be free of any physical and mechanical
defects that can be detected either visually or by the operation of the equipment. Inspect per
4.5.33.
3.5.34 Reliability. The radio set shall have a specified Mean Time Between Failure
(MTBF) of no less than 1880 hours. Reliability testing as specified per 4.5.34 shall be conducted
to determine compliance with this requirement.
3.5.35 Burn-in. Every radio set shall be subjected to a forty-eight (48) hour burn-in period.
The last twenty-four hours of burn-in shall be failure free. The duty cycle shall be 1 minute
transmit and 9 minutes receive. The Radio Set shall be exercised and monitored in the same
manner as during reliability testing. The failures shall be recorded and analyzed but shall not be
considered relevant for computation of the equipment MTBF.
3.6 Environmental conditions.
3.6.1 Low temperature. The Radio Set shall not be damaged or be degraded in its
performance when subjected to temperatures as low as -70°F for storage and -50°F for operation
(see 4.6.1).
3.6.2 Temperature shock. The Radio Set shall not be damaged or be degraded in its
performance when subjected to temperature fluctuations of between -70°F to + 160°F for storage
and -50°F to +125°F for operation (see 4.6.2).
3.6.3 High temperature. The Radio Set shall not be damaged or suffer degradation of
performance when subjected to high temperatures of +160°F for storage and +125°F for
operation (see 4.6.3).
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