User's Manual

UHF Analog Driver/Transmitter/ Chapter 5, Detailed Alignment Procedures
Translator
LX Series, Rev. 3 5-1
Chapter 5
Detailed Alignment Procedures
This transmitter/translator was aligned at
the factory and should not require
additional adjustments to achieve normal
operation.
The transmitter takes the baseband
audio and video inputs and converts
them to the desired UHF On Channel RF
Output at the systems output power
level. The translator takes the UHF on
channel input and converts it to a
combined IF output that connects to the
exciter, which converts it to the desired
UHF On Channel RF Output at the
systems output power level.
The exciter/amplifier of the LX Series
transmitter is of a Modular design and
when a Module fails that module needs to
be changed out with a replacement
module. The failed module can then be
sent back to Axcera for repair. Contact
Axcera Customer Service Department at
724-873-8100 or fax to 724-873-8105,
before sending in any module.
5.1 Module Replacement
Module replacement on the LX series
products is a relatively simple process.
All modules plug directly into the
backplane board except for the power
amplifier module, and in higher power
units, the power supply and power
amplifier modules, that plug into a blind
mating connector. To replace a module,
refer to the following procedure.
Loosen the two grip lock connectors,
located on the front panel, at the top
and bottom of the module,
counterclockwise until the module
releases. The Modulator, IF Processor,
Upconverter and Controller/Power
Supply can then be gently pulled from
the unit. To remove the Driver/Power
Amplifier Module in the exciter/amplifier
chassis assembly, the two cables, Input
and Output, connected to the rear of the
chassis must be removed. These two
cables and also a 6/32” x ½” shipping
screw, located between the two
connectors, must be removed before the
module will slide out.
After removal of the failed module, slide
the replacement module in place and
make certain it connects to the
backplane board. If the replacement
module is a driver/PA Module replace
the two cables to the rear of the
exciter/amplifier chassis assembly. The
6/32” x ½” shipping screw does not
need to be replaced, it is only used
during shipping. If the replacement
module does not slide in easily, verify it
is properly aligned in the nylon tracks,
located on both the top and bottom of
the module.
Note: Each Module has an assigned slot
and will not fit properly or operate in the
incorrect slot. Do not try to place a
Module in the wrong slot as this may
damage the slot or the connectors on
the backplane board.
Each module has the name of the
module on the front, bottom for
identification and correct placement.
The Modules are placed in the unit from
left to right; (1) Receiver (in translator)
or a Blank panel in a transmitter, (2)
Modulator (in analog transmitter) or a
Blank panel in a translator or digital
transmitter, (3) IF Processor, (4)
Upconverter, (5) Controller/Power
Supply and (6) Power Amplifier.
5.1.1 Initial Test Set Up
Check that the RF output at the coupler
is terminated into a dummy load rated at
the output power level of the
driver/transmitter/translator. While
performing the alignment, refer to the
Test Data Sheet for the system and
compare the final readings from the