System information

9797B-70 C-Band TXRX Maintenance and Troubleshooting
7-15
4. In the “Response” window
verify proper GPS position
to within 1 nautical mile
of your current position.
The Latitude & Longitude position
of the GPS will be displayed in the
following format:
“@ LAT,N,LON,E,A”
Where LAT and LON are in degrees
and minutes, LAT will be followed
by N or S (North or South), LON will
be followed by E or W (East or
West), then a status character and
finally a checksum character.
Furuno default value is in Japan at
34.4N 135.2E
(@3444,N,13521,E,,_).
After acquiring a good fix at Sea Tel
the string is @3800,N,12202,W,A^
for our 38N 122W Latitude and
Longitude position.
The status character tells you the
status of the GPS.
“,” (Comma) = GPS has NOT
acquired a proper fix,
“N” = GPS fix is NOT valid
“A” = GPS has acquired a valid fix.
7.4. Maintenance
7.4.1.
The antenna and equipment frame are balanced at the factory however, after disassembly for shipping or
maintenance, balance adjustment may be necessary. The elevation and cross-level motors have a brake
mechanism built into them, therefore, power must be ON to release the brakes and DishScan and antenna
drive must be OFF to balance the antenna. . Do NOT remove any of the drive belts. Balancing is
accomplished by adding or removing balance trim weights at strategic locations to keep the antenna from
falling forward/backward or side to side. The antenna system is not pendulous so 'balanced' is defined as the
antenna remaining at rest when left in any position.
Balancing the Antenna
The “REMOTE BALANCE” parameter (located at the end of the Remote Parameters after REMOTE TILT) of the
ACU. When enabled, Remote Balance Mode temporarily turns DishScan, Azimuth, Elevation and Cross-Level
drive OFF. This function is required when trying to balance antenna systems that have a built-in brakes on
the elevation and cross-level motors.
Assure that Antenna power is ON and that the antenna has completed initialization.
At the ACU:
1. From the ACU - REMOTE BALANCE parameter: Enable balance mode (refer to your ACU manual).
The screen should now display “REMOTE BALANCE ON”.
At the Antenna:
2. At the Antenna: Balance the antenna with the elevation near horizon (referred to as front to back
balance) by adding, or subtracting, small counter-weights.
3. Then balance Cross Level axis (referred to as left-right balance) by moving existing counter-
weights from the left to the right or from the right to the left. Always move weight from