User's Manual
Table Of Contents
- 1 MXi201V AMPLIFIER–INTRODUCTION
- 2 SAFETY NOTICES
- 2.1 Beryllium Oxide Warning
- 2.2 Other Toxic Materials
- 2.3 Dangerous Voltages
- 3 LARCAN PARTS, ASSEMBLIES, ASSEMBLY DRAWINGS AND SCHEMATIC NUMBERS
- 1 MXi CONTROLLER
- 2 AMPLIFIER INSTALLATION AND STARTUP
- 3 TEST AND TROUBLESHOOTING
- 4 MAINTENANCE
- 5 SERVICE
- 6 TEST EQUIPMENT SETUP
- 7 SPECIFICATIONS
- 1 MXi DUAL PALLET VHF AMPLIFIER
- 1 FUNCTIONAL DESCRIPTION:
- 2 RF PREAMPLIFIER
- 3 POWER AMPLIFIER:
- 4 TWO-WAY SPLITTER/COMBINER
- 5 ADJUSTMENT OF BIAS VOLTAGE TO ESTABLISH PROPER QUIESCENT FET BIAS CURRENT:
- 6 LOW POWER SWEEP AMPLIFIERS
- 1 MXi POWER SUPPLY LAR1000-50-P5337
- 2 POWER SUPPLY DATA SHEET REPRINT
MXi DUAL PALLET AMPLIFIER CHASSIS
1 MXi DUAL PALLET VHF AMPLIFIER
The MXi Dual Pallet VHF Amplifier Chassis Assembly consists of a standard 19" rack mountable 5.25" (3RU)
enclosure containing the amplifier heatsink assembly, a fan array assembly consisting of four DC cooling fans, a
controller board with built-in RF detectors, and a front panel consisting of ON/OFF, RESET switches and an
LCD/Touchpad, and a rear panel assembly with connectors for interfacing to external equipment. A dual output
DC power supply for powering the amplifier, the controller and the cooling fans is also housed in this enclosure.
Figure 15 is a front view of the MXi201V amplifier, showing the LCD Touchpad, ON/OFF switch, Status PWR
(Green) and FAULT (Red) LEDs, and RESET switch.
Figure 15 Front View of MXi Amplifier
Figure 16 Rear View of MXi Amplifier
The rear of the MXi AMPLIFIER has the following connectors (from left to right):
• RF IN SMA connector-
• RF OUT N connector
• RF TP SMA connector – RF sample
• REMOTE CONTROL 15-pin D-shell connector
• RS232 SERIAL nine-pin connector
• INTERLOCK terminal board
• AC INPUT
The MXi is classified as a broadband amplifier, thus it is operational to cover the entire VHF television spectrum in
three bands comprising ATSC channels 2 through 4, 5 through 6 and channels 7 through 13.
Controlled DC power to the amplifier assembly comes from the high efficiency 1000W switching power supply via
a two-pin connector, J4 of the MXi Controller Board. Regulated DC of +50V from the switching power supply is
the B+ voltage to the amplifier heatsink assembly. The second auxiliary output of the power supply is +12VDC,
which is used for powering the controller and the cooling fans.
The heatsink cooling fans are the +12DC, 4-inch muffin model. Typically, they come ON at the same time B+ is
applied to the power amplifier. It is connected to the controller PC board connector, J8. As built, the cooling fans
TSM21Q-365 Rev 0 July 17, 2009 MXi Dual Pallet Amplifier Chassis 24