Flat Plate Antenna
The flat plate antenna transmits and receives RF pulses.
The flat plate antenna is an array of radiation slots. The RF
pulses radiate from each of the slots. The antenna makes a
beam 5.4 degrees high and 5.4 degrees wide. The antenna
weighs 6 lb (2.7 kg). It is 23 inches wide.
Antenna Pedestal
The antenna pedestal contains these items:
* Scan motors
* Antenna position monitors
* Elevation and scan disable switches.
There is a horizontal scan motor to move the antenna +/- 90
degrees from the airplane centerline. There is also an elevation
scan motor to move the antenna +/- 40 degrees up or down.
This value includes manual tilt selection from the WXR control
panel.
There is a zero position monitor and an incremental monitor for
each motor. These monitors send antenna horizontal scan and
elevation scan position data to the WXR R/T. There are
elevation and azimuth scales that permit a visual
measurement of the tilt and scan angles.
Re BARKINGMAD
"Hingeing" on a planar array aerial, e g 737NG?
Hingeing as it is hung so that it moves in two of three directions, yes, sorry if I didn't express that part.