The end of the X-band waveguide run from the
188.8.131.52 Waveguide Connections. - A waveguide run is
receiver transmitter is terminated with a square flange-
required from the X-band antenna pedestal waveguide
to-round-flange adapter (supplied by Raytheon). This
rotating joint to the waveguide output flange in the X-
adapter is secured to the pedestal by a circular V-clamp
band receiver transmitter.
and threaded bolt assembly. Access to the inside of the
Waveguide (in standard 12-foot lengths) and choke
pedestal is achieved by removing the circular clamp and
and cover flanges are available from Raytheon (see
then unscrewing the captive bottom plate securing
screws. The entire top of the pedestal including the
when assembling waveguide runs in a choke-to-cover
antenna array can then be tilted forward by grasping the
coupling. The choke flange must be positioned to face
handle at the rear of the pedestal top case.
away from the antenna and toward the receiver
Rectangular plastic brackets (see Table 1-5) shall
be used to secure the waveguide run to the mast and to
Coupling flanges must be silver-soldered to the
the wheelhouse structure.
waveguide ends. The following guidelines should be
1. The waveguide ends and flange walls
Check and, if necessary, lubricate the antenna pedestal
must be chemically cleaned to ensure an efficient bond.
Install the breather plug
2. The finished joint must be smooth and
(supplied in the installation kit) at the filler port.
3. The internal walls must be smoothed and
polished to ensure a continuous contact.
Table 2-5 X-Band Waveguide Components
Part Number for
Part Number for
Waveguide, rigid, copper, without flanges,
Flange, cover, brass, with clearance holes
Flange, cover, aluminum, with clearance holes
Flange, choke, brass, with 8-32 threaded holes
Flange, choke, aluminum with 8-32 threaded holes
Waveguide, flexible, with flanges, 24-inch length
Elbow, E-bend, 900, brass, with flanges
Elbow, H-bend, 900, brass, with flanges
Twist, 900, brass, with flanges, 6-inch length
Waveguide, elliptical, semi-rigid, aluminum
Flange, cover, elliptical, aluminum
Flange, choke, elliptical, aluminum
Screw, 8-32, 5/8-inch, SST
Lockwasher, Number 8
Mounting bracket, E-plane, plastic
Mounting bracket, H-plane, plastic
Transition, waveguide, WR90 to WR112
NOTE - VJR112 parts are available worldwide; TBS - Part No. to be supplied.