MIL-DTL-55288E
4.8.1.2 Free space VSWR test (see 3.8.2.1). The entire AS-1729/VRC Antenna with its permanent dust cover in
place shall be mounted over a ground plane and under the conditions of 4.8.1.1 above. The VSWR shall be
measured by any commercially standard means acceptable to the Government to determine compliance with 3.8.2.1.
4.8.1.3 Data and correlation records. Measurement procedures for all electrical tests made shall conform to the
requirements of this specification. An up to date file describing equipment and procedures shall be maintained by the
contractor. Included in the contractor's file, as a minimum, shall be:
a.
Design and engineering drawings of all special equipment, including all electrical values and mechanical
details and all production test procedures for piece parts, subassemblies, and the complete item on order.
b.
A complete test layout for all electrical tests performed including complete details regarding type and length
of cables used, type of connectors used, construction and adjustment test or positioning fixtures used, any
wire and cable dress and routing, and any critical dimensions and adjustments that must be adhered to.
c.
Complete step-by-step method of operation of the test equipment and methods of computation.
d.
Calibration records on all test equipment used in taking measurements.
e.
Records showing equivalency to devices specified contractually when an "or equal" device is permitted by
the Government. All of the data listed above shall be available for review by Government personnel when
requested. All disputes regarding the accuracy or adequacy of the contractor's records shall be referred to
the acquiring activity for resolution.
4.8.2 Base assembly resonance test (see 3.8.1). The base assembly (less cable-mount assembly SM-D-542042)
when tested in accordance with the following Base Assembly Resonance Test Procedure shall resonate within
frequency limits given in 3.8.1.
Base assembly resonance test procedure:
a.
Set up the equipment as shown on figure A-1 (see appendix A).
b.
Insert MX-6707/VRC (less cable mount, assembly SM-D-542042) into Matching Unit-Base Alignment
Cavity and secure with grounding pins.
c.
Connect control cable from Alignment Cavity Control to connector J2 of MX-6707/VRC under test.
d.
Turn on equipment and allow to warm up for a minimum of 30 minutes.
e.
Set the Alignment Cavity Control sub-band selector switch to sub-band 1.
f.
Depress 10 MHz sweep width switch on Sweep Generator.
g.
Adjust the Sweep Generator variable sweep width control to maximum (initially).
h.
Set the Sweep Generator sweep mode/time switch to .01 seconds.
i.
Set the counter measurement interval switch to .01 seconds.
j.
Adjust the Sweep Generator variable sweep width control for approximately 4 MHz display bandwidth on
oscilloscope with applicable table II sub-band resonance frequency at center of oscilloscope. Adjust center
frequency control as necessary.
k.
Adjust Sweep Generator variable amplitude control for approximately full vertical display on oscilloscope.
l.
Adjust the Sweep Generator dot position control until dot is displayed at the peak of the response curve.
Read and record the frequency displayed on the counter.
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