MIL-DTL-83517A
APPENDIX
PROCEDURE FOR MEASUREMENTS OF VOLTAGE STANDING WAVE RATIO,
RADIO FREQUENCY LEAKAGE AND RADIO FREQUENCY TRANSMISSION LOSS
A.1 SCOPE
A.1.1 Scope. This appendix is a mandatory part of this specification. The information contained
herein is intended for compliance. This appendix is to provide additional information to the user of this
specification in performing the VSWR, RF leakage and RF transmission loss measurements.
A.2 APPLICABLE DOCUMENTS
This section is not applicable to this appendix.
A.3 PROCEDURE FOR VOLTAGE STANDING WAVE RATIO (VSWR)
A.3.1 VSWR test (see 4.5.11). The intent of the VSWR measurement is to assure connector
integrity at its mating connector interface and typical mechanical mounting or component attaching
surfaces. The test fixtures will incorporate a low mismatch design which will continue the coaxial
structure to a precision hermaphroditic connector. The test fixtures are not intended to represent low
VSWR launches to strip, microstrip or other transmission lines.
A.3.2 Test connector. The standard test connector interface shall be in accordance with MIL-STD-
348.
A.3.3 Standard precision adapters. The standard precision adapters shall be of design compatible
with appropriate dimensions for the hermaphroditic connector, in accordance with IEEE 287. The design
of mating pair of adapters shall be electrically and mechanically symmetrical. The electrical phase length
shall be equal where possible for plug and jack adapters. On designs where an electrical reference
cannot be defined with a mechanical reference, a hypothetical plane shall be defined which test
connectors must stand alone or as a proper design and not compensate for deficiencies of the mating
connector. The above requirement shall be met in order to assure that the calibration data, step 2 on
figure 1, is within required accuracy to quality item 11.
The VSWR as specified for item 11 is for one adapter, but the VSWR value is determined by taking the
square root of the value of a matched pair. The above computation can be considered valid when
adapter symmetry exists.
By definition, the above method shall be used to establish the adapter acceptance value.
This test method is not to be interpreted as a method to measure absolute VSWR values for adapters.
A.3.4 Standard precision test fixtures. The standard precision test fixtures shall be of design
compatible with appropriate dimensions for the hermaphroditic connector in accordance with IEEE 287.
The design of the mating test fixture set shall be electrically and mechanically symmetrical. The electrical
phase length shall be equal where possible. On designs where an electrical reference cannot be defined
with a mechanical reference, a hypothetical plane shall be defined which bisects the mated set.
The VSWR as specified for item 12 is for one half of the fixture set, but the VSWR value is determined by
taking the square root of the value of the set. By definition, the above method shall be used to establish
the test fixture acceptance value. This test method is not to be interpreted as a method to measure
absolute VSWR value for the test fixture.
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