User's Manual Part 1

CL1TC-4 400W DVB-H Transmitter Commissioning and Operation
Product Manual, Rev. 1 42
5.3.3 Turning On the RF Output
1. Check the A
larm Status screen for active alarms. The only alarm present should be
GPS Quality Low. The GPS Quality Low alarm will take up to 5 minutes to clear as
satellites are acquired.
2. During the initial on-site turn on, it is recommended to set the transmitter output
level to 46 dBm (minimum value) before the transmitter is placed in Broadcast
mode. This will ensure that the effects of a transmission line or antenna fault are
minimized when the RF is turned on. Navigate to Config –> HPA Control and set the
output power level to 46 dBm – see Figure 5-6
.
3. For SFN operation, check the Alarm Status screen to ensure that the GPS Quality
Low alarm has cleared. Once the alarm has cleared, the transmitter can be placed in
Broadcast mode. Note: For MFN operation, the GPS is not required to be locked.
4. From the HPA Control page, set the Transmitter Operating Mode to Broadcast.
5. The modulator front panel Status Display window “i”, HPA front panel LCD, or Web
GUI Global Status page can be used to monitor the transmitter forward and reflected
power levels. Alternatively, a power meter can be connected to the HPA sample port
to monitor the forward power level.
6. If the forward and reflected power levels are acceptable, increase the RF Output
Power Level by 3 db and continue to monitor the forward and reflected power levels.
7. Continue to increase the RF Output Power Level by 3 dB, until the desired output
level is reached (max of 56 dBm).
Figure 5-6 HPA Control
5.3.4 Turning Off the RF Output
Before turning off
the AC power switch, the user should set the Transmitter Operating Mode
to Standby. This will ensure that the next time the transmitter is powered on, it will be
powered on in Standby mode.