Instruction Manual

6X Series Liquid-Cooled Transmitter Chapter 2, System Description
Instruction Manual, Rev. 0 2-1
Chapter 2
System Description
The 6X Series Liquid-Cooled Transmitter is made up of a frequency agile exciter and
a multi tray power amplifier system. The 6X Series is a state-of-the-art liquid cooled
transmitter which uses our frequency agile exciter and the latest LDMOS devices for
broadband operation across the entire UHF band. The power amplifier system
operates at the highest power density available, reducing floor space requirements.
The 6X Series transmitter is available in power levels up to 40kW ATSC in a very
small footprint.
The very compact and completely modular design uses parallel amplifier and power
supply modules which can be removed and replaced while the transmitter is on the
air. This allows users to minimize spare parts stock and also enables simple and
inexpensive channel changes. Additionally, the modular construction provides a
clear upgrade path, allowing broadcasters to begin with a low power transmitter and
add modules and combiners to achieve any power level desired.
2.1: Digital Modulator
The Axciter adaptive digital television modulator utilizes a patented VSB modulation
technique, which makes it possible to generate a virtually perfect 8VSB IF signal.
Since the Axciter is a completely reprogrammable digital television exciter, it can be
easily upgraded in the field with new software versions through the convenient front
panel USB port. Critical parameters can be set and queried directly on the color LCD
screen or through an interface to a personal computer.
The DSP circuitry also handles frequency offsets allowing an unlimited number of
user selectable offsets. In addition, asynchronous resampling techniques