MIL-DTL-55288E
m. Adjust the Alignment Cavity Control sub-band selector switch to next sub-band.
n.
Repeat step j, k, and l.
o.
Repeat steps m and n until all sub-bands have been measured.
NOTES:
(1) The Matching Unit-Case (SM-D-542066) shall be on the MX-6707/VRC under test.
(2) For each Matching Unit-Base Alignment Cavity, the contractor shall establish and maintain a standard
MX-6707/VRC in accordance with A.3.1.
(3) The contractor maintained standard MX-6707/VRC unit shall be used at the beginning of each work
day, or whenever there are questionable readings to verify that the Matching Unit-Base Alignment
Cavity is operating satisfactorily.
4.8.3 Power handling capability test (see 3.8.3). All power handling capability tests shall be performed using the
antenna test chamber. Measurements shall be made at one frequency in each sub-band of table II for a total of ten
(10) frequencies. The power handling test time for each frequency selected shall be one (1) hour. Each operating
hour shall be followed by a non-operating one-half hour for purpose of cooling. Frequencies selected for these tests
should exhibit approximately the same VSWR in the chamber as is required by table III.
4.8.4 Whip antenna test.
4.8.4.1 Top whip section test (see 3.8.4.1). The test shall be performed in accordance with MIL-STD-202, method
301, to determine compliance with 3.8.4.1.
a.
The test voltage shall be 15,000 V rms.
b.
The test voltage shall be applied along the full length of the upper whip section, and along the lower whip
section from a point one inch above the stainless steel ferrule to a point an inch below the metallic
captivating pin.
4.8.4.2 Lower whip section test (see 3.8.4.2). Measurements shall be made to determine the characteristic
impedance of the 50 ohm and 125 ohm cables within the whip section using the "Time Domain Reflectometry" test
method as outlined in Hewlett-Packard Journal, Volume 15, No. 6, dated February 1964.
4.8.4.3 Whip assembly test (see 3.8.4.3). For the purpose of this test, the whip assembly shall consist of:
a.
Antenna Element, AT-1095/VRC, upper section.
b.
Antenna Element, AT-1730/VRC, lower section.
c.
The Base Spring.
This whip assembly shall be mounted on a 10-foot by 10-foot copper sheet (see figure 1). The admittance
(normalized to 20 millimhos of the assembly shall be measured at the end of a 27 inch (685.8 mm) length of RG-
58C/U coaxial cable connected to the "RF Connector-Adaptor, SM-B-542115", at 75.0 MHz. For admittance
information, see appendix A.
4.8.5 Control cable voltage (see 3.8.5). The Matching Unit-Base, Antenna MX-6707/VRC antenna control
connector J2, pin voltages, and manual/automatic band switch indexing shall be measured for compliance with table
IV.
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