Section 3 - E-Compact Bb3 High Power Series Uhf Digital Transmitters; Overview - Hitachi E-Compact High Power Series Operation Manual

Section 3 – E-Compact BB3 High Power
Series UHF Digital 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 / 608-701MHz)
• 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 High Power BB3 Family of solid-state DTV transmitters includes four models that
provide transmitter power outputs (TPO) from 930 to 3800 watts ATSC 3.0. Each power amplifier
module has an excellent power density, with 3RU and 19". Featuring high gain Broadband Doherty
LDMOS configured for transmitting up to 1.1kWrms (ATSC 3.0). Doherty Technology provides high
efficiency and consumption cost reduction of up to 60% when compared to conventional
transmitters. The final power amplifier configuration that is in parallel depends on the required
output power level. 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 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.
There are three basic E-Compact High Power transmitter equipment configurations available:
1) Single Drive = One exciter driving the amplifier chain (SD)
2) Dual Drive = Two exciters (main/standby selectable) driving the amplifier chain (DD)
3) 1+1 = Two SD transmitters operating in parallel with high level RF switching (Custom made)
E-Compact HP-BB3 Series
22 | 169