Hitachi EC702MP-BB3, Operation Manual

Page: 21 / 108

21 | 108
E-Compact MP-BB3 Series
Section 3 – E-Compact BB3 Medium Power
Series UHF Digital TV Transmitters
1. Overview
The E-Compact High-Power family of air-cooled Doherty solid-state transmitters from Comark was
designed specifically for the repack marketplace. Its design is simple, rugged, reliable, and ultra-
efficient. Advanced standard features are included to ensure:
• maximum transmitter efficiency using Doherty amplifiers
• maximum flexibility with broadband amplifier technology (470-608MHz)
• optimum signal performance in all operating modes
• maximum reliability for 100% power output
• ease of initial setup and operation
• ease of monitoring and diagnostics
• flexible solutions for all installations
The E-Compact Medium Power BB3 Family of solid-state DTV transmitters includes two models
that provide transmitter power outputs (TPO) from 210 to 420 watts ATSC 3.0. Each power amplifier
module has an excellent power density, with 2RU and 19", and features features high gain
Broadband Doherty LDMOS configured for transmitting up to 510 Wrms (ATSC 3.0). Doherty
Technology provides high efficiency and consumption cost reduction of up to 60% when compared
to conventional transmitters. The transmitters are compliant with all FCC and ATSC requirements.
We recommend the use of the EXACT-V2 DTV driver with linearization circuits to compensate for
linear and non-linear distortions for the E-Compact High-Power line transmitters. EXACT-V2 is
software upgradeable for compatibility with ATSC 3.0.
The E-Compact family of solid-state TV transmitters includes a human-machine interface via an
LCD display on the front panel and menus activated by programmable keys. Alarm indicators and
normal controls, as well as power readouts, are available on the LCD.