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RC4000 ACU Boardset
AUXILLARY FUNCTIONS
According to the RC4000's configuration and current conditions, several additional functions may be
initiated via the MANUAL mode.
3.2.1.1 Heading Fix
From the MANUAL mode the user is given the ability to correct the mount's true heading based on where
the selected satellite is found. This HEADING FIX capability is available when all of the following
conditions are true:
1) MANUAL mode was entered following a successful LOCATE
2) The selected satellite is geostationary (inclination = 0 )
3) The mount's position has not already been saved
4) The heading has not already been fixed (automatically or manually)
When the above conditions are present, the "<0-9>JOG ANTENNA" message at the bottom of the LCD
will alternate with "<ENTER>FIX HEADING" message. The user should positively identify that he is on
the selected satellite and manually peak up in azimuth and elevation. When the Enter key is pressed, the
MANUAL mode will switch to the following screen.
PREDICTED AZIM: -50.9
CURRENT AZIM: -48.7
DIFFERENCE:
<BKSP>APPLY DIFF. TO HEADING <MODE>EXIT
The HEADING FIX screen shows the name of the selected satellite in the SAT: field. The PREDICTED
AZIM field shows the target azimuth originally predicted by the LOCATE function based on the mount's
current position. The CURRENT AZIM field shows the where the user peaked up on the satellite while in
MANUAL mode.
The DIFFERENCE field shows the value obtained by subtracting the predicted azimuth from the current
azimuth. This difference should reflect the error in the mount's true heading. Pushing the BKSP key will
apply the difference to the mount's heading for use in subsequent LOCATE operations. In the above
example, if the current true heading of the mount was 195.0 it would be "fixed" to 197.2.
NOTE: to make this "fixed heading" persist through the next powering down of the RC4000, the mount's
position would need to be "saved" via the POSITION mode. If the difference is applied, the RC4000 will
proceed to the POSITION screen.
If the user is unsure that applying the difference is the correct thing to do, pressing the Mode key will
return the RC4000 to the MANUAL mode.
Chapter 3
HEADING FIX
SAT:galaxy 7
2.2
69
Software
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