HPX® FM Transmitter Series

The HPX FM transmitters are the next generation in high-power transmission for FM analog and HD Radio broadcasting. This amazing line of transmitters offers power and efficiency at an extremely attractive price point.

Powerful, Simple and Rugged
Depending on mode and power level, the Harris HPX transmitter achieves market-leading power levels up to 42 kW analog FM, utilizing either the 4CX20,000 or 4CX25,000 series rugged Radial Beam Power Tetrode tube. Additionally, systems can be combined into a dual unit for redundancy and power levels up to 84 kW analog FM. Unlike high-power solid-state transmitters, the HPX series can safely operate at higher power levels with elevated VSWR.

Outstanding Value
In terms of dollars-per-watt, the HPX tube-based transmitter outperforms all solid-state transmitters in the same class. Operators realize a savings of nearly 25 percent in cost of ownership over the lifetime of the transmitter. This includes regular tube replacement.

Superior HD Radio Operation and Performance
Combined with the Harris FlexStar HDX-100 exciter and advanced Real-Time Adaptive Correction (RTAC™) feature, the HPX transmitter provides superior analog and HD Radio performance, exceeding NRSC-5B mask compliance even at the highest power levels. Up to 31.5 kW FM+HD at -20dBc injection and 17 kW at -10dBc injection are available. For a complete HD Radio system, add the new FlexStar HDE-200 embedded exporter and the HDI-200 advanced services program importer.

Maximum Efficiency
The HPX system provides the highest operating efficiency of any transmitter in its class by utilizing tube-based ¼ wave, bandwidth-optimized cavity, grounded cathode design, a 3-phase linear high-voltage power supply, switching power supplies for screen, grid and low voltage control circuits, and a single, high-efficiency 3-phase blower. It can maintain peak efficiency over a wide range of power levels and operating modes.

Compact Footprint — Simple Installation
The most compact, high-power transmitter in its class, the HPX system’s matching power amplifier (PA) and power supply cabinets measure only 32 in. (W) x 35 in. (D) x 78 in. (H). The small footprint and the internal low-pass harmonic filter simplify installation and lower shipping costs, while also reducing cost and space requirements in the facility. The high-voltage power supply cabinet and PA cabinet can be separated with the optional (standard 40-ft length) cable set. Other custom lengths are available upon request.

Unparalleled Control and Diagnostics
The HPX transmitter incorporates the most advanced control system available. The basic controller option provides critical life support, control, automatic exciter switching and fault diagnostic functions without reliance on a microprocessor. The enhanced transmitter control unit option combines the basic controller functionality with a microprocessor and ¼ VGA touch-screen graphical user interface (GUI) for increased control and diagnostics, including TCP/IP connectivity, WEB remote control/monitoring and SNMP communications. A simple, parallel user interface connects to today’s most popular remote transmitter control systems.

Reliability and Serviceability
The solid-state driver stage uses the field-proven Platinum Z/ZX IPA modules and ZX series switching power supplies in a dual redundant configuration. Modules are front-panel accessible and hot-swappable to allow ease of service, provide reliability and simplify spares inventory. Maintenance technicians can easily and safely service the PA cavity because of the ability to bypass the PA stage using FlexPatch, and put the IPA or even the exciter directly to air with the blower and all high voltage shut down.

Common Components and Architecture
From the highest-power FM+HD systems to the lowest-power FM-only systems, the entire HPX transmitter line uses virtually all the same major components, including the PA cavity. This consolidation of components makes parts sparing simple and straightforward.

Future-Proof, Smooth Upgradeability
The HPX transmitter features the world-class FlexStar HDx-FM exciter, which can be field-upgraded to HD by adding an Exgine card; Z/ZX IPA components that switch modes “on-the-fly”; a universal transmitter control unit; and additional common components across the full line. With only minor component changes required, upgrading the HPX is a simple, smooth, and inexpensive process, whether upgrading to higher power or upgrading from analog to HD Radio or both.