Transmitter's Control System - Hitachi EC702HP Operation Manual

Section 1 - Introduction (UHF Digital TV Transmitters)
E-Compact - Air Cooling - ATSC - High Power
HP transmitters Family (High Power) has high efficiency and high power density.
The high´s power line consists of refrigerated air transmitters with output powers of 700W up to
8.5kW (after filter) to ATSC standard.
The intelligent digital management system using microcontrollers, allows control and monitoring
in real time of all transmitter functions. All operation is performed through keypad and digital
display both located on the front panel, through which we have access to all readings, alarms
and settings.
The RF amplification system is comprises by a splitter, power drawers in parallel, each with its
own power supply and independent supervision and isolated combiner.
Main Features:

Management of all equipment functions and power drawers across the front display.

High Efficiency providing low power consumption.

Doherty amplifier technology with LDMOS High Voltage transistors

Compact Design.

Amplifier with quick coupling connection (Hot Swap), facilitating installation and maintenance.

Digital automatic Pre-correction automatic (linear and nonlinear)

Control of the transmitter integrated to the exciter.

User interface through display allows monitoring and configuration of the equipment.

Software for measuring measures the main parameters of the transmitter without the need
for expensive equipment and specific.

WEB and SNMP interface for remote management.

Option of automatic redundancy in excitation (optional).

GPS receiver for internal time base (optional)

Power supplies with power factor correction.

Power protection reflected with gradual reduction of the direct power control (foldback).

Start with Inrush.

Combiners and isolated splitters, allowing removal and insertion of drawers with the
connected equipment (provided that the drawer is turned off).

1.4.1 Transmitter's Control System

 Control Architecture for Hitachi Kokusai Linear' Transmitters:
Hitachi Kokusai Linear's transmitter control system allows control and monitoring, through front
display, all parameters of the equipment.
This system is comprised by a control unit (exciter's integrated function) which through a RS485/
MODBUS network, gather and sends information to the power drawers.
Manual Rev. 0.0 - April 2016 1-3