SeaSpace TeraScan 1.5M, Operation And Maintenance Manual

Page: 171 / 232

TeraScan 1.5m Polar Satellite Tracking Antenna O & M Manual
155
8.5.11 Entering PCU "N" Coefficients
The Antenna PCU contains calibration coefficients that must be reloaded when the PCU is replaced.
The software procedure described here is used to enter the coefficients recorded using the procedure
described in Section 8.5.10. This procedure should always be done following replacement of the PCU.
Tools:
None
Part Location:
Values are entered via the
ac
command.
Procedure:
1. The PCU must be operating and not initializing while the coefficient values are being entered via the
ac
command.
2. Enter ac .
3. Enter 1 (or chain for the antenna ).
4. To reload all coefficient values into the PCU, refer to the coefficient values recorded in steps 4, 5 and 6
of Procedure 8.5.10. Use the
ac
command to enter the coefficient sequence number (0 to 6 see Table 8-1
on page 154) followed by the last three digits of the corresponding coefficient value recorded, then press
ENTER after each value.
5. After all values have been entered:
a. Enter
NVRAM
to save the changes.
b. Enter
reset
to reinitialize the antenna and use the changed values.
Note: See Section 7.2.4.1 if PCU’s n0__ value is incorrect.
For example, if the recorded values are:
Coefficient Example Value
0 0073
1 0025
2 0025
3 0012
4 0223
5 0146
6 0000
Then the entry sequence in the ac command would
be as follows:
n0073 Enter
n1025 Enter
n2025 Enter
n3012 Enter
n4223 Enter
n5146 Enter
n0000 Enter