RESEARCH CONCEPTS RC2000C Manual page 62

56 RC2000C Polar Tracking Antenna Controller
In MANUAL mode, the user can jog the antenna. If the UP arrow key is depressed, the antenna will
move up. If the user suddenly depresses the DOWN arrow key and the antenna drive signals were
instantaneously reversed, the antenna continues to move up for some small period of time, then the
antenna reverses direction and starts to move down. This can cause position count errors. When the
antenna drive signals are configured for down movement but the antenna is still moving up, pulses which
are received would cause the elevation position count to decrement when the count should really be
incremented because the antenna is really still moving up.
The anti-reversal system keeps the antenna from rapidly changing direction. If the antenna has been
moving in a given direction, the 'Deadband CONFIG mode items specify the amount of time that the
system will wait before asserting the antenna drive lines to move the antenna in the opposite direction.
There are 2 different 'Deadband values specified - there are unique fast and slow speed values. If the
antenna has been moving fast, the 'Fast Deadband parameters specify the wait interval; if the antenna
has been moving slow, the 'Slow Deadband parameters specify the wait interval. Both 'Deadband values
are given in milliseconds.
AZ/EL FAST DEADBAND:2000
175-5000 MSEC
AZ/EL SLOW DEADBAND: 800
175-5000 MSEC
The values assigned to the Az/El Fast Deadband and Az/El Slow Deadband variables can affect other
systems on the controller not related to the anti-reversal system. These features are explained in
Chapter 7 - Operational Troubleshooting Tips. For normal operation these features should be disabled.
To DISABLE these features, make sure that the value entered for Az/El Fast Deadband DOES NOT end
in '01' (i.e. when the value is divided by 100 the remainder is not 1), and that the value entered for Az/El
Slow Deadband DOES end in either '00' or '50' (i.e. the value entered is a multiple of 50).
During an automatic move in AUTO mode, the 'Coast Threshold CONFIG mode items set the number of
counts before the target position is reached where the drive will be deactivated. The idea is to deactivate
the drive and let the antenna coast into position. If prior to the initiation of the move operation, the total
number of counts that the actuator has to move to reach the target position is less than the 'Coast
Threshold, the drive will be deactivated when its position is within 'Max Position Error counts of the target
position.
AZIM COAST THRESHOLD: 4
1-40 COUNTS
ELEV COAST THRESHOLD: 4
1-40 COUNTS
The 'Max Position Error CONFIG mode items set the maximum acceptable error between the final resting
position and a target position for an automatic move which occurs in AUTO mode.
AZIM MAX POSITION ERROR: 1
0-10 COUNTS
ELEV MAX POSITION ERROR: 1
0-10 COUNTS
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Chapter 5
CONFIG
ENT,BKSP,SCRLL ^v
CONFIG
ENT,BKSP,SCRLL ^v
CONFIG
ENT,BKSP,SCRLL ^v
CONFIG
ENT,BKSP,SCRLL ^v
CONFIG
ENT,BKSP,SCRLL ^v
CONFIG
ENT,BKSP,SCRLL ^v
Modes Function Description