MIL-PRF-39012E
4.6.23 RF leakage (see 3.26). The mating connector pair to be tested shall be assembled as shown
on figure 6 and tested as shown on figure 7. (The procedure for determining the dimensions of the
cavity on figure 7 may be found in A.3.1 of the appendix). The close fitting brass tubing shall be
machined to thread into connector in lieu of compression nut (see 3.1). This test setup between 500
MHz and 11 GHz, shall have a dynamic range from 20 dBm to better than 100 dBm or a difference
of 90 dB. Using +20 dBm RF source with 10 dB isolation, an additional 30 dB range can be obtained
by use of attenuator pads or a step attenuator producing a total range of 120 dB. The shortening
plunger is adjusted to produce a maximum reading in the detector with the triaxial assembly inserted.
The insertion loss caused by the insertion of the triaxial assembly adjusted as shown is a measure of
the total leakage of the mated connector pair both at its interface as well as at the clamping points to
both cables.
Reference
"RF Leakage Characteristics of Popular Coaxial Cables and Connectors, 500 MS to 7.5 GHz", by J.
Zorzy and RF Muehlberger, in the Microwave Journal, November 1961, pp 80-86.
loss of a mated connector pair is defined as the increase of a loss due to insertion of a mated
connector pair in a cable; this includes the reflection losses to the cable and the dissipating losses in
the pair. First insert cable assembly number 1 and tune out its input VSWR by means of tuner
number 4 and balance setup. Then insert the cable assembly number 2 which includes the connector
pair under test. With tuner number 4 in the same position and the electrical length of the cable
assembly the same as that of number 1, record increase of insertion loss; add to this as a correction
the cable loss of the removed section due to the length ĆL1 + ĆL2 at this frequency. The sum of the
increase and the correction is the insertion loss of the connector pair. Use of alternate test methods
may be approved by the qualifying activity.
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