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Section 4 - Initial Activation (ATSC Transmitters)
NOTE: If an alarm occurs during the power increase, it is advisable to reset the output power of
the transmitter to seek the solution. If necessary contact the Service Department of Hitachi
Kokusai Linear Electronic Equipments S / A.
Check if there is any abnormal or differential heating, in the connection joints between
the transmitter, filter, antenna and adder's imbalance load. If there is any abnormal warming
in an isolated way, this may indicate some flaw or imperfection in that connection. This
must be checked before continuing on increasing the transmitter power.
NOTE: When operating under normal conditions, the modules located at the transmitter's rear
may reach up to 55°C. This is due to the fan speed control, which is responsible for keeping the
transistor's temperature at 60°C (it can be set from 50 to 60 in the EQP Setup Menu, it is
factory set to 60 and the optimization of this temperature is done during activation by varying
according to the efficiency of the transmitter and the ambient temperature). See item 3.4.5 PA
Temperature Control. As well as the presence of aluminum heatsinks and high thermal dissipation
pallets. All passive devices are located at the rear panel and operate within' the temperature
ranges recommended by the manufacturer.
Check the current reading and the drawer module temperature, observing whether there
is any abnormality present. If there is any, check the connections of RF and if the problem
persists, contact the Hitachi Kokusai Linear Customer Service.
Repeat the previous steps for programming 25%, 50%, 75% and 100% of the rated
power. Between steps, consider a minimum of fifteen (15) minutes.
Enable / disable the automatic shutdown of the equipment by the absence of ASI signal.
Sequence 3 screens to enable automatic reconnection of the equipment by the absence / presence
of the ASI signal.
Select Transmitter Setup in the screen Setup Menu [1000]. Press ENTER.
Manual Rev. 0.0 - April 2016
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Access Automatic Level Control and select On.
Use the "
" key to display the next screen option.
4-7
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