MIL-DTL-55288E
3.8 Electrical requirements.
3.8.1 Base assembly resonance (see 4.8.2). The base assembly (less cable assembly SM-D-542042) when
subjected to the test specified in 4.8.2 shall resonate within frequency limits specified in table II.
TABLE II. Base assembly resonance values.
Resonance
Sub-band
frequency
(MHz)
39.80 ± 0.40
1
39.75 ± 0.65
2
39.95 ± 0.45
3
40.10 ± 0.50
4
39.80 ± 0.80
5
39.60 ± 0.60
6
39.60 ± 0.60
7
40.30 ± 1.00
8
39.90 ± 1.40
9
39.75 ± 1.25
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3.8.2 Voltage standing wave ratio (VSWR).
3.8.2.1 VSWR free space (see 4.8.1.2). The VSWR of Antenna AS-1729/VRC as measured in free space at the rf
input connector of the base assembly shall meet the requirements in table III.
3.8.3 Power handling capability (see 4.8.3). Antenna AS-1729/VRC shall be capable of continuous operation with
an input rf power of 70 watts for one hour, without any damage to the antenna or any of its components. During this
power handling capability test, the reflected and forward power shall be monitored and readings taken at the start of
the test and at 5-minute intervals. The reflected power shall not change more than +1.5 watts through out the test.
3.8.4 Whip measurements.
3.8.4.1 Top whip section (see 4.8.4.1). When tested in accordance with 4.8.4.1, there shall be no visible effects or
evidence of dielectric breakdown due to an applied voltage of 15,000 V rms.
3.8.4.2 Lower whip section (see 4.8.4.2). The lower whip section, when subjected to the same test described in
4.8.4.1, shall show no evidence of dielectric breakdown. Also, when tested to 4.8.4.2, the lower whip section shall
show impedance of 50 ohms ± 2 percent for the lower portion of the coaxial conductor, and 125 ohms ± 2 percent for
the upper portion of the coaxial conductor.
3.8.4.3 Whip assembly (see 4.8.4.3). The whip assembly admittance shall be measured at 75 MHz. The
susceptance (jB) shall be 3.1 ± 4.0 millimhos and the conductance (G) shall be 27.0 ± 5.0 millimhos.
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