Chapter 4 ______________________________________________________ Hand Terminal RTH21
VAISALA _______________________________________________________________________ 43
Angle and Phase Display Modes
The Angle display mode is the default mode after power-on. This mode
displays the mechanical azimuth and elevation angles of the antenna. It
also shows the tracking mode of the RT20A (auto/manual). The azimuth
angle is always displayed in positive figures.
Figure 29 Angle Display with Automatic Tracking
Figure 30 Angle Display with Manual Tracking
When tracking manually, the antenna is controlled with the RTH21
direction keys.
You can monitor the phase difference and signal strength difference of
the radiosonde signal by pressing the PHASE key. This mode displays
the azimuth and elevation phase differences between the reference and
azimuth antennas as well as between the reference and elevation
antennas. The phase difference is shown as electrical degrees. The signal
amplitudes are shown as percentage of the reference signal. Normally
they are between 95 and 105. This display mode also shows the tracking
mode of the RT20A (auto/manual).
Figure 31 Phase Display with Automatic Tracking
Figure 32 Phase Display with Manual Tracking
With the phase display, use the direction keys on the hand terminal to
manually control the antenna.
When the RT20A is in manual mode you can drive the antenna in
azimuth and elevation directions with the direction keys (ÏÐÍÎ) in all
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