Maintenance Guide Part 1

NeTIS MAINTENANCE GUIDE – Version 1.1 24/139
If the signal is correct but has a carrier on another channel, check the transmission
channel programming and check the clocks; if these tests are correct, the UCM
module is defective.
If the signal is correct but on a carrier that is offset compared to the nominal value,
check the clocks or the synchronisation sources.
The complete constellation must comply with the diagram below:
If the constellation presents points that spread radially, check the level.
If the constellation presents points that spread at a tangent, check the clocks.
2.6.5.2 Possible alarms on the transmission chain
If the TOS indicator on the UCM board is on, disconnect the antenna and replace it with a 50
Ohms load.
If the TOS indicator switches off, check the antenna connections.
If the 'low power' indicator is on, disconnect the antenna and replace it with a 50 Ohms load.
If the indicator stays on the PA is defective (check its power supply)
If the indicator switches off there is probably an antenna connection problem which
caused a fault on the PA
If the 'low power' indicator is off, check the signal power output from the PA.