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MIL-F-14252 ( AR )
possible, the placing of tubes and tube clamps shall be such as
to allow easy removal of the tubes.
3.11.13 Waveguide assemblies. - ASESA publication 49-2, "Armed
Services Index of RF Transmission Lines and Fittings", should be
used as a guide for selecting RF components to be used in fire
control equipment.  Aluminum waveguides or fittings shall not
be employed where they will come in contact with silver or cop-
per alloy waveguides or fittings.  Copper alloy flanges shall
be silver plated (after assembly) when assembled to silver wave-
guide tubing.
3.11.13.1 Rigid rectangular.  - Rigid rectangular waveguide tub-
ing shall conform to Specification MIL-T-85.  Attenuation plates
sha11 conform  Specification  MIL-A-11052.  Flanges shall be
on the "Standard List of Waveguide Flanges"
Of the types appearing
in ASESA publication T49.2.
3.11 .13.2 Flexible.
- Where it is Impracticable to use rigid
.
waveguides flexible
waveguides conforming to Specification
JAN-W-287 may be used.
Wiring and harnesses.- Wiring and harnesses shall be
3.11.14
neat and sturdy.  Insulated wires shall be formed into harnesses
except where operation of the equipment would be adversely af-
fected thereby or where it IS mechanically impracticable as In
the case where the resulting harnesses would be excessively
large and would interfere with operation or maintenance of the
equipment. Where harnesses are employed between hinged parts,
sufficient slack and protection shall be provided to prevent
chafing or breaking of individual wires with repeated flexing.
3.11 .14.:  Lacing tape.- Harnesses shall be laced with tape con-
forming to
35

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