MIL-DTL-28839B
4.6.11 Power handling capability (when specified, see 3.1 and 6.2) (see 3.14). The waveguide shall be subjected
to the radio frequency power level specified (see 3.1) at the frequency, simulated altitude, and temperature specified
(see 3.1). Power shall be maintained for 1 hour after the temperature of the waveguide has reached equilibrium
(temperature shall not vary more than 5°C within a 15-minute period). During the test, the waveguide shall be
terminated in a matched load (1.05 VSWR, maximum). After the test, VSWR shall be measured as specified in 4.6.2.
4.6.12 Surface roughness (see 3.15). The average interior surface roughness of the waveguide shall be
measured using a brush type profilometer. A 1-foot length shall be cut in half longitudinally. Then both lateral and
longitudinal surface roughness tests shall be made over the entire length of the two halves.
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 or in-house contractor 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 activities within the Military Service or
Defense Agency, or within the military service's system commands. 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. Waveguides covered by this specification are intended for use as radio frequency transmission
lines in military services electronic equipment.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of this specification. The complete PIN (see 3.1).
b. Packaging requirements (see 5.1).
e. If unitized loads are required (and not at the option of the contractor).
6.3 First article. The first article should be a preproduction sample, a first production item or it may be a standard
production item from the contractor's current inventory. The first article should consist of one unit. The contracting
officer should include specific instructions in all acquisitiont instruments, regarding arrangements for examinations,
tests, and approval of the first article.
6.4 Environmentally preferable material. Environmentally preferable materials should be used to the maximum
extent possible to meet the requirements of this specification. As of the dating of this document, the U.S.
Environmental Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals
and additional information is available on their website at https://www.epa.gov/osw/hazard/wastemin/priority.htm.
Included in the list of 31 priority chemicals are cadmium, lead, and mercury. Use of the materials on the list should
be minimized or eliminated unless needed to meet the requirements specified herein (see section 3).
6.5 Subject term (keyword) listing.
Axial twist
Pressurization
Attenuation
Power handling
Bending radius
Semirigid
First article
VSWR
Flexible
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