MIL-DTL-87104C
Step 19: Increase the numerical value measured in step 16 by the dB value determined in step 18. The
resultant dB value represents the ratio of power flowing in the test sample to the energy "leaked" from the
test sample over the length determined in step 17.
Step 20: Calculate the RF leakage power ratio for a 12-inch (304.8 mm) length of cable component by
decreasing the numeric value determined in step 19 by the factor of:
12
10 log
Length (inches) of spacing determined in step 17
Step 21: Mated interface pairs shall be measured by the same procedure described above for cable with
the measured value being corrected for the leakage attributable to the length of cable contained between
the short circuits.
d.
Measurements at each required test frequency shall be made in accordance with the requirements of
4.6.2.7.2b and 4.6.2.7.2.c.
e.
The RF leakage power ratio values determined in 4.6.2.7.2c, steps 20 and 21, for each test frequency and
each particular point on the assembly shall be recorded.
4.6.2.7.3 Accept-reject criteria (see 3.5.1.9). If the RF leakage of the test sample is greater than the value
specified in the applicable detail specification, the sample shall be considered to have failed this test.
4.6.2.8 Velocity of propagation test (see 3.5.1.10). This test shall determine the velocity of propagation of a
coaxial assembly over its specified design frequency range. The velocity of propagation of a coaxial assembly shall
be stated as a percentage of the velocity of propagation in free space.
4.6.2.8.1 Test setup.
4.6.2.8.1.1 Test equipment. The test equipment used to perform this test shall meet the requirements of 4.3.4 and
shall consist of the following:
a.
A microwave sweep oscillator with a frequency range that covers the design frequency range of the test
sample.
b.
An analyzer with suitable readout features.
A phase bridge with a measurement accuracy of ±0.1 percent.
c.
d.
A calibrated section of air line whose length equals the length of the test sample.
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