User's Manual

Digital ATSC Exciter-Modulator System Chapter 1, Introduction
Axcera Axciter, Rev. 0 2
Axciter. It is important to know what these selections do and when they
should be used. The Axciter is designed to work over a wide range of
transmitter types and field conditions. There are certain front panel
settings that if improperly selected could cause undesired results. Please
pay particular attention to any warnings or notes in this manual about
various selections to make sure that your transmitter is always operating at
its peak performance.
Safety
The digital modulators manufactured by Axcera are designed to be easy to
use and repair while providing protection from electrical and mechanical
hazards. Listed throughout the manual are notes, cautions, and warnings
concerning possible safety hazards that may be encountered while
operating or servicing the system. Please review these warnings and
familiarize yourself with the operation and servicing procedures before
working on the system.
Read All Instructions
All of the operating and safety instructions should be read and
understood before operating this equipment.
Retain Manuals
The manuals for the system should be retained at the transmitter
site for future reference. We provide two sets of manuals for this
purpose; one set can be left at the office while one set can be kept
at the site.
Heed Notes, Warnings, and Cautions
All of the notes, warnings, and cautions listed in this safety section
and throughout the manual must be followed for your safety and
optimum performance of this equipment.
Follow Instructions
All of the operating and use instructions for the system should be
followed.
Cleaning
Unplug or otherwise disconnect power from the equipment before
cleaning. Do not use liquid or aerosol cleaners. Use a damp cloth
for cleaning.
Ventilation
Openings in the back of the cabinet and tray front panel are
provided for ventilation. There is a small fan mounted near the rear
of the Axciter to pull cool air into the cabinet. To ensure reliable
operation, and to protect the unit from overheating, these openings
must not be blocked. Pay particular attention to the ventilation
holes in the bottom of the Axciter front panel. These holes are
placed in locations necessary to affect proper cooling of the high-
speed digital circuits. They should not be blocked by equipment
placed directly below the Axciter. NOTE: Never operate the Axciter
for extended periods of time with the top cover removed. The top
cover is an integral component of the overall cooling system. If it is