Instruction Manual
6X Series Liquid-Cooled Transmitter Chapter 3, Installation, Set Up and
Problem Identification Procedures
Instruction Manual, Rev. 0 3-7
Axciter to the upconverter. Proper setting of these parameters is system dependent,
and other systems manuals should be referenced for information on their setting.
3.6.2: Transmitter Set Up Procedures
3.6.2.1: Initial Test Set Up
This Exciter Digital transmitter was aligned at the factory and should not require
additional adjustments to achieve normal operation.
This section describes the set up of the Axciter Modulator system. The Axciter
Modulator takes the SMPTE 310 or optional ASI digital stream input and converts it to
a 44MHz intermediate frequency (IF). This IF then feeds the upconverter which
converts the signal to the desired On Channel RF Output. The signal then drives the
power amplifier section of the transmitter, which produces the system’s output power
level.
Check that the RF output at the DTV Mask Filter is terminated into a dummy load of at
least the rated output of the system or connected to the antenna for your system.
While performing the alignment, refer to the Test Data Sheet for the transmitter and
compare the final readings from the factory with the readings on each of the modules.
The readings should be very similar. If a reading is substantially different from the
factory reading, it is likely that there is a problem in that module that should be
rectified before proceeding with the transmitter setup.
Switch On the main AC for the system and the individual circuit breakers on the
cabinets and assemblies. Check that AC is present to all systems.
This transmitter operates using a SMPTE 310M or optional ASI input that connects to
J27 located on the rear panel of the Axciter Modulator Tray. Check that the input is
present. If an (Optional) external 10 MHz reference input from a GPS is used, check
that it is connected to J9 on the Axciter Modulator.
The check of and the setup of the drive levels are completed using the front panel
adjustments located on the Axciter Modulator Tray. The level of the RF output which
includes adjustment of the drive level of the Intermediate Power Amplifier and the
adjustment of the linearity and phase pre-distortion to compensate for any nonlinear
response of the Power Amplifiers are controlled within the Axciter Modulator Tray.
3.6.2.2: Setting Up the Output Power of the Transmitter
The following adjustments are completed using the LCD screen located on the front
panel of the Axciter Modulator Tray. On the Axciter Main Screen, push the button
next to the Upconverter tab on the right side of the screen. This will open the
Upconverter Main Screen. Set the AGC to Manual by selecting 3 on the keyboard
entry. The screen will now indicate AGC Manual. Set the transmitter to full power
using the front panel screen of the Axciter.
3.6.2.3: Setting up of AGC 1
To set up the AGC, first the AGC must be activated. Locate the 8 position DIP switch
SW1 mounted on the Control Board in the Exciter Driver Tray. The Upconverter DIP