The Harris® HPX® series is the next generation in high-power transmission for FM analog and HD Radio™ broadcasting. The HPX series covers a range of power levels, with three models offering nominal FM power of 20 kW, 30 kW and 40 kW in a single configuration, and up to 80 kW in a dual configuration.
With the most flexible control system available in the market, the HPX transmitter has a unique combination of dedicated meters and control circuits for rock-solid and simple control, coupled with an optional user-friendly remote monitor and control system that features a color GUI.
In terms of dollars-per-watt, the HPX tube-based transmitter outperforms all solid-state transmitters in the same class. Operators can realize a significant savings in cost of ownership over the lifetime of the transmitter, including regular tube replacement.
The HPX transmitter provides a smooth upgrade path to HD Radio. Simply add the FlexStar® HDx exciter and the HDE-200 exporter for the latest in HD Radio signal generation, and if desired, the HDI-200 importer will complete the portfolio with supplemental audio channels and other advanced applications data services.
Harris can provide everything needed for the transition to digital radio — from source through studio through STL through transmission. And a Harris systems team is available to help put together a package that makes the most sense for any operation —now and in the future.
HD Radio is a trademark of iBiquity Digital Corp.
Power Amplifier Stage
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.
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.
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.
Specifications and designs are subject to change without notice.
|Frequency Range||87.5 to 107.9 MHz|
|Maximum Power Output||HPX20||HPX30||HPX40|
|FM Mode||21 kW||31.5 kW||42 kW|
|FM+HD -20 dBc||21 kW||26.5 kW||31.5 kW|
|FM+HD -10 dBc||15 kW||16 kW||>17 kW*|
|HD Mode -20 dBc||8.4 kW||9.4 kW||9.6 kW|
|HD Mode -10 dBc||6.1 kW||6.8 kW||7.0 kW|
|AC to RF Efficiency||HPX20||HPX30||HPX40|
|AC to RF Efficiency||HPX20||HPX30||HPX40|
|FM+HD -20 dBc||58%||61%||62%|
|FM+HD -10 dBc||40%||41%||42%|
|Output Impedance||50 ohms|
|Output Connector||3-1/8 in. EIA or 4-1/16 in. male flange|
|Maximum VSWR||1.5:1 for 100% power output with proportional foldback|
|Input Voltage||50-60 Hz, 197 to 250 V AC, 3 phase, 3-wire closed
Delta or WYE — 250 amperes max or 360-415 V AC
4-wire WYE — 125 amperes maximum
|Input Voltage Variation||± 5% for full specification, +10%, -15% for continued operation|
|Maximum Altitude||10,000 ft (3,048 m) high-altitude/high-power cooling kit required above 7,500 ft (2,286 m) MSL|
|Analog FM Mode||32° to 122° F (0° to 50° C); derate 3.6° F (2° C) for each 1,000 ft (304.8 m) elevation|
|RF Harmonics/Spurious Emissions||Meet or exceed FCC, NRSC, ITU and IC requirements|
|Asynchronous AM S/N Ratio||55 dB below equivalent 100% AM modulation|
|Synchronous AM S/N Ratio||52 dB below equivalent 100% AM modulation|
|Other Audio Specifications||Determined by exciter|
|Dimensions (W x D x H)||2 cabinets, each 32 x 35 x 78 in. (81 x 88.9 x 198.1 cm);
Main PA cabinet contains 13RU of 19 in. rack space for dual exciters and ancillary equipment
|Standards Compliance||NRSC-5B or most current HD Radio standard; FCC, Industry Canada, Anatel (Brazil);
RoHS-compliant design and manufacturing; Safety EN60215
|*Maximum power currently 17 kW at -10 dBc with existing Crest Factor Reduction techniques. Improvements in efficiency and PAPR control within the FlexStar exciter indicate that an increase of 1-1.5 dB (23 kW max) available output power at -10 dBc is anticipated.|