Research Concepts RC2000C - Manual (Page 54)

46 RC2000C Az/El Tracking Antenna Controller Chapter 5 Modes Function Description
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BAND: C,K 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.
CLEAR TRACK 0 or 1 Press 1 to clear the track table entries, or 0 to leave as
is. Be careful with this one!
RESET UPDATE 0 or 1 Press 1 to clear the track table UPDATE flags, 0 to not
modify the existing data.
FORCE UPDATE 0 or 1 Press 1 to set the track table UPDATE flags, 0 to not
modify the existing data. (Opposite function of RESET
UPDATE.)
MAX ERROR 1-30 Specifies the maximum tracking error in tenths of a dB.
Default value is 5.
SEARCH WIDTH 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.
To exit this option, press ENTER at 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 that is active. Table 2 describes the
action taken for each of the track sub-modes.
TABLE 2
Sub-mode XXXXXX Action
STEP REPEAK Causes the controller to immediately repeak the
antenna.
SEARCH SEARCH Causes the controller to initiate another search.
PROGRAM .ALIGN The controller will reposition the antenna based on the
current sidereal time and the current Az/El data in the
track table.
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 jog the antenna in azimuth and elevation and set the azimuth and
elevation software limits. If the controller powers up and either the azimuth or elevation 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. 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 polarization movement is allowed while LIMIT mode is active, but polarization
position and limit information is not displayed. It should be noted that not all versions of the controller
support polarization control.