- 470 MHz – 860 MHz Broadband Amplifier
- Digital ready LDMOS PA provides 250 Watt output for the broadcast of digital waveforms
- ALC or AGC mode of operation
- Touch screen display for real-time user interface
- Remote control and self-monitoring via Ethernet and RS485 interfaces
- Built-in web server accessible through RJ45 connector with Internet Explorer
- Integrated AC/DC power supply
The DHPA 250UX is designed to operate as a final amplification stage for a terrestrial UHF transmitter or repeater system. It amplifies a UHF-Band input signal to a digital average output power level of 250 Watts while maintaining its linear characteristics.
The DHPA 250UX architecture is based on a solid-state design operating in Class A/AB linear mode over a frequency range of 470 MHz to 860 MHz. The amplifier is protected against input overdrive and overheating. The protection circuits are all self-correcting, allowing the amplifier to be restored to its normal operating state upon removal of the fault condition.
The DHPA 250UX incorporates an internal automatic self-levelling loop to maintain constant gain over the life of the equipment. The automatic level control (ALC) circuit will compensate for the input signal level variations and the gain variations caused by changes in temperature as well as for the gain change due to devices ageing. Depending on the application, the amplifier can be configured to operate in AGC mode, maintaining a constant gain value. The amplifier’s operational parameters are monitored and controlled by an embedded system controller that can be accessed from the touch screen LCD, Ethernet or RS 485 interfaces.
The DHPA 250UX is a field-replaceable system component that includes an integrated AC/DC power supply and is designed for indoor installation. The amplifier is forced air-cooled using four high-performance fans, which are installed on the amplifier enclosure front panel. All of the amplifier’s components are enclosed in a standard 19” rack mount chassis, occupying only 3 RU of cabinet space.