Technical Manual

SRT X-BAND RADAR SYSTEMS
ANNEX
304202P003 13 Rev. C
smaller than minimum bending radius shown in table. Note that H plane
minimum bending radius is considerably larger than E plane radius. Waveguide
bend can be formed by hand.
An improvised mandrel that will provide curved forming surface of equivalent
radius may be used. waveguide may be twisted slightly for flange alignment.
Use cable grip as temporary anchor to support waveguide until connector has
been properly mated with Antenna Group input. Provide sufficient slack to
permit easy flange alignment.
4.1.3 Anchoring
Maintain hoist line tension until anchoring is completed. Attachment to lighting
conduit or vertical angle irons runs is recommended in installations where
antenna mast do not provide adequate or convenient hanger support.
Waveguide subject to vibration or wind must not be left unsupported.
Space hangers approximately 1 Ft. (0.3m) apart for first three at top of vertical
run and 4 Ft. (1.2m) apart thereafter. If distance from feed termination to 1st
hanger is more than 4 Ft., waveguide must be supported. Position hangers to
hold waveguide away from antenna mast. rubbing against edges can cause
damage. Do not tighten hangers excessively as dents or deformations can
cause degradation in electrical performance.
Hangers kit contain support brackets which snaps into slots on each side of
hanger base. See detail A-A. After each hanger is attached and support bracket
is snapped in, thread captivated nut to end of bolt as shown. Place waveguide
into hanger, bend hanger around waveguide and slip bolt into slot of bent tab,
catching nut under tab. Tighten bolt until hanger grips firmly. Excessive
tightening may damage waveguide. If jacket has been cut, apply vinyl tape to
damaged area. Top and bottom of waveguide should be grounded by low
impedance conductors. Antenna Group input connection cannot serve as top
ground.