MIL-DTL-4946E
4.6.4.7 Vibration. The antenna shall be subjected to the vibration test in accordance with method 514,
procedure I.
4.6.4.8 Salt fog. The antenna shall be subjected to the salt fog test in accordance with method 509, procedure I.
After exposure, the salt deposits shall be removed by a gentle wash or a dip in running water not warmer than 38°C
(100°F) and a light brushing. The antenna shall then be inspected.
4.6.4.9 Rain. A simulated rainfall equivalent to 4 inches per hour shall be applied to the antenna under the
following conditions and in the order specified:
(a) The antenna shall be erected in its normal operating position with the antenna non-operating.
(b) The first hour the rainfall shall be vertical; the second hour the rainfall shall be 45 degrees to the
perpendicular, 15 minutes to a side.
(c) With the simulated rainfall still applied, 1.0 kilowatts of RF power, within the operating
frequency range of the antenna, 100 percent amplitude modulated, shall be applied for
2 minutes. 1132 volts, 60 Hz with one ampere available may be used instead of 1 kW RF.
(d) A simulated rainfall shall then be 90 degrees to the perpendicular for 1 hour, 15 minutes to a
side, then back to the vertical for 1 hour and the power test repeated.
(e) The performance of the antenna shall not be below the minimum specified in section 3.
4.6.4.10 Loading tests.
4.6.4.10.1 Wind. The antenna, with its normal method of mounting, shall be subjected to direct or
simulated loading of wind at 100 miles per hour (mph) for a period of 1hour. The antenna shall then be examined
and shall show no damage.
4.6.4.10.2 Ice. The antenna shall be loaded with 1 inch of radial ice and subjected to a 60 mph wind for 1 hour.
The antenna shall be checked for performance during the test.
4.6.4.11 Operating dynamic vibration. The antenna shall be subjected to operating dynamic vibration tests across
the 225 MHz to 400 MHz band. With the transmitter at one frequency and the receiver tuned to different frequencies
within the band, the antenna shall be shaken such that the total excursion of any part of the antenna shall not be less
than 2 inches. When vibrated, the antenna shall not generate or force the transmitter to generate spurious radiation.
The purpose of this test is to dynamically simulate wind vibrations as occur under operational environments.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD personnel, these personnel need to contact the
responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are
maintained by the Inventory Control Point s packaging activity within the Military Department or Defense Agency, or
within the Military Department s System Command. Packaging data retrieval is available from the managing Military
Department s or Defense Agency s automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful but is not mandatory)
6.1 Intended use. The antenna AT-197( )/GR covered by this specification is intended for use as an antenna for a
ground radio transmitter and receiver such as the AN/GRC-27, AN/GRC-29 and AN/TRC-32 for communication with
aircraft equipped with UHF command radio sets and such ground UHF stations as necessary in the UHF terminal
area.
7
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business