Chapter 4 ______________________________________________________ Hand Terminal RTH21
VAISALA _______________________________________________________________________ 51
When the manual LCD contrast control is selected, the terminal requests
you to select the contrast, displaying the following menu, see Figure 50
below.
Figure 50 Selecting Contrast Manually
Change the display contrast manually with the cursor keys Í or Î. The
new contrast value can be seen from the display. Press the ENTER key
to accept. The new contrast value is not saved permanently by the hand
terminal. To get back to Auto Display Contrast Control, select the Contr
command, followed by its submenu (MORE) and Auto.
Calibration Command
When you select Calibrate the following submenu appears. You can
now calibrate either the elevation synchro or the phase measurement
system. Each RT20A has been calibrated at the factory before delivery,
so there is normally no need for calibration. When and how the
calibrations will be carried out is explained in the RT20A Service
Manual.
E l s y n c h r o C M D
P h a s e S e l
Figure 51 Submenu of Calibrate Menu
Driving the Antenna to the Desired Position
The hand terminal can command the control processor to drive the
antenna's azimuth and elevation to desired positions (that is, angles) by
Pos.Selection. First, the terminal requests the azimuth angle and then the
elevation angle. Next, the terminal commands the control processor to
drive the antenna to the chosen position. The display mode is changed to
the angle mode by the terminal.
When the Pos.Selection command is selected, a display shown in Figure
52 on page 52 will appear, requesting you to give the angle values. Enter
the angles with the number keys. After you press the number, the cursor
moves to the right and the previous cursor position shows the entered
number. Pressing the Í key (backspace) moves the cursor to the left and
the number is deleted. Accept the values with the ENTER key. Cancel
the whole command with the CLR key and the terminal returns to the
previous display mode. If the number you entered is out of the acceptable
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