Limits Mode - RESEARCH CONCEPTS RC2000C Manual

46 RC2000C Polar Tracking Antenna Controller
SEARCH RETRY
BAND: C,K
CLEAR TRACK
RESET UPDATE
FORCE UPDATE
MAX ERROR
SEARCH WIDTH
To exit this option, press ENTER any time to return to the MENU screen.
REPEAK, SEARCH, or ALIGN
Hitting the 3 key followed by the ENTER key at the main MENU display will initiate some action by the
controller. The action taken depends on the TRACK sub-mode which is active. Table 2 describes the
action taken for each of the track sub-modes.
Sub-mode
STEP
SEARCH
PROGRAM
Selecting item number 3 from the main MENU display will always cause the MENU system to terminate
and initiate the selected action.
5.5

LIMITS Mode

Limits mode allows the user to set the azimuth and elevation software limits. If the controller powers up
and the limits are corrupted, LIMITS mode is automatically invoked. When LIMITS mode is active, there
are not software-imposed restrictions on antenna azimuth and elevation movement. Depressing the
LEFT ARROW key will cause the azimuth motor to be energized. If the antenna is equipped with
mechanical limit switches, it is recommended that the user set the mechanical limits before setting the
software limits. It may be necessary to recruit a helper to insure that the antenna is not allowed to strike
any objects while it is being moved.
Before setting any limits, the user must insure that the antenna motor drive polarity is correct. See
section 3.4.1. Note that the polarization movement is allowed while LIMIT mode is active, but polarization
position and limit information is not displayed.
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0-999 MINS The period of time between successive SEARCH
attempts when no signal is present and track table data
is not available. Default 10 minutes.
1 or 2 For dual band inclined orbit satellites, this prompt allows
the user to change the frequency band. Note that the
current band is displayed in the upper right hand corner
of the LCD.
0 or 1 Press 1 to clear the track table entries, or 0 to leave as
is. Be careful with this one!
0 or 1 Press 1 to clear the UPDATE flags for the track data, 0
to not modify the existing data.
0 or 1 Press 1 to set UPDATE flags, 0 to not modify the
existing data. (Opposite function of RESET UPDATE.)
1-30 Specifies the maximum tracking error in tenths of a dB.
Default value is 10.
1-10 Specifies a normalized scaling factor that increases or
decreases the width of the search window. Values
greater than 3 increase it, less than 3 decrease it.
Default value is 3.
TABLE 2
XXXXXX Action
REPEAK Causes the controller to immediately repeak the
antenna.
SEARCH Causes the controller to initiate another search.
.ALIGN The controller will reposition the antenna based on the
current sidereal time and the data in the track table.
Chapter 5 Modes Function Description