Designed to provide broadcasters with a product that will meet their needs like no other solution on the market, this state-of-the-art liquid-cooled transmitter uses our frequency agile exciter and the latest LDMOS devices for broadband operation across the entire UHF band. Power amplifier systems operate at the highest power density available, reducing floor space requirements.

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, which is especially important to group owners and networks, 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 easily add modules to achieve any power level desired. The Axcera 6X Series liquid-cooled solid state transmitter is available in power levels up to 30kW DVB-T in a very small footprint.

With over 25 years of experience in the design and manufacture of solid state transmitters, Axcera continues to provide the latest technology, enabling our customers to focus on the future.

Exciter based on Digital Signal Processing (DSP) technology is fully compliant with NTSC, ATSC, PAL and DVB requirements and can evolve as broadcast requirements change. An adaptive correction option is also available.

The frequency agile upconverter accepts the IF and converts it to any UHF channel using a very low phase noise dual-conversion synthesized oscillator that is fully compliant with AC106 VALIDATE recommendations. The output channel is easily selected through the front panel of the controller for a truly frequency agile exciter/driver chassis.

Every Axcera 6X Series transmitter is comprised of highly reliable broadband amplifier modules operating in a parallel configuration. Each module uses the latest LDMOS transistors, providing very efficient and linear operation and the highest power density available today. For convenience, each amplifier module operates independently, allowing easy removal and replacement while the transmitter is on the air. All power amplifier modules are interchangeable.

The extensive correction capability of Axcera's digital exciters allows all stages of the final amplifiers to operate in the very efficient class AB mode, minimizing system power consumption.

The broadband amplifier design allows all modules to operate over the entire operating band without any retuning, helping to minimize spare parts stock for multiple station operators. This also provides for simplified channel changes, requiring only replacement of channelized filters.

Each Axcera 6X transmitter is equipped with low-loss, liquid-cooled combiners which reduce combining losses for optimal overall system efficiency.

The compact heat exchanger and pump package is designed for high reliability and simple installation, either indoors or outdoors.

To ensure that the 6X Series transmitter will provide reliable service in challenging environments, a high degree of protection is provided in each amplifier chassis. Overdrive, VSWR and overtemperature protection are all included.

More than just VSWR cutback, Axcera's Intelligent VSWR Protection&trade (IVP) actually recognizes the cause of VSWR and reacts appropriately in order to protect the entire transmission system while ensuring minimal loss of signal coverage. This unique feature determines whether the high VSWR is caused by a catastrophic problem like a transmission line arc, or if it is a temporary problem such as antenna icing. In the catastrophic case a typical transmitter may continue to produce power, resulting in expensive antenna, transmission line or RF system repairs. But with Axcera's IVP, the system will quickly remove drive to the final amplifier, avoiding further damage to the system components. For a temporary VSWR condition like antenna icing, the system will remain on the air at a reduced power level until the VSWR returns to a normal level, ensuring minimal coverage loss during the VSWR condition.

AGC around the system ensures that the transmitter output remains stable. An output bandpass and trap filter is included to provide superior out of band rejection. This RF network also adds lightning protection through the DC short circuit of the band pass filter.

All local transmitter control and monitoring functions are available through the front panel touch screen VGA display. The system controller provides a detailed look into the operation of the transmitter system. Parameters such as forward and reflected power, transistor currents, power supply voltages, module temperatures, system mode, and much more can be viewed directly from the front of the control panel.

Systems are available with an Advanced Control System which provides complete local system control and monitoring through a front panel graphical user interface and a remote interface through a web browser or available SNMP client.

The Web browser option allows real-time remote control of the transmitter system from any Internet connection and a standard PC with a Web browser, such as Microsoft Explorer.

Systems are available with an SNMP client with the ability to communicate with higher-level network management systems that support simple network management protocol.

• Dual Exciter Adds a backup exciter
  system, providing full redundancy.
  Includes automatic switching that selects the backup exciter in the event of a main exciter failure.
• Adaptive Digital Linear and Non-linear Precorrection Provides pre-correction which automatically tracks and corrects for distortions, both linear and non-linear, in the complete transmitter system.
• N+1 Power Supply Maintains full
  transmit power in the event of a power supply failure
• Dual Water Pump Package Adds a
  backup water pump and switcher which automatically selects the backup pump upon failure of the main pump.
• SNMP Client Provides the ability to communicate with higher-level network management systems that support simple network management protocol.

• Agile Exciter & Broadband LDMOS Amplifier Modules The frequency agile exciter and broadband solid state amplifier modules cover the entire UHF band, minimizing spare parts stock and simplifying channel changes.
• Parallel Amplifiers and Power Supplies Parallel amplifier modules and power supplies provide excellent reliability and are perfect for unattended operation.
• Protection Circuitry We have built a high degree of protection into all of our transmitters and exciter systems. Features such as Intelligent VSWR Protectionª and overtemperature and overdrive circuits protect the system from undesirable conditions. Additionally, RF shielded circuit enclosures help our products to operate free of interference even in high RF environments.
• Remote Control Capability AxceraÕs 6X Series transmitters are available with an easily accessible interface designed to work through a web browser or SNMP client.



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World-class support from a world-class organization. Axcera's support team is dedicated to you, the customer and is available 24 hours a day, 7 days a week, 365 days a year.