Operation and Maintenance Manual

RDACS User’s Guide
August 2000
11
Control Description
Antenna
Defines the antenna Scan mode: PPI, Stop, Sector, or
RHI. PPI (plan position indicator) mode displays a 360-
degree sweep in azimuth at the specified elevation angle.
(This is the normal operating modes)
Stop scans weather only within the specified azimuth and
elevation levels. This mode is useful for investigating a
particular storm cell.
RHI (range-height indicator) shows the distance from the
radar at the specified azimuth angle and displays the height
above the radar on the vertical axis, from El 1 to El 2. (Note
that RHI exaggerates the vertical size of an echo, giving a
distorted impression of the actual storm. The angular
resolution of the radar increases as the beamwidth
decreases, so the narrower the beam, the lesser the size of
the echo.)
Sector performs a pie-shaped track at the set azimuth,
within the specified span, at the set elevation level.
Apply
Puts the new specifications into operations, and returns you
to the main Radar Control window.
Close
Ignores any changes you have made, and returns you to
the Main Control window.
3.4.2 Extended Control
The Extended Control dialog box is similar to the Quick Control dialog box described in
Section 1.4.1 except you have two additional options: Preferred Product and Duration.