S-Band 400W Power Amplifier


  • High linearity LDMOS PA provides 400 Watt output for the broadcast of digital waveforms
  • Adaptive non-linear pre-corrector
  • Fully protected against input overdrive, temperature and output load VSWR conditions
  • Remote control and self-monitoring via RS485 or RS422 interfaces
  • Minimum operational life expectancy of 10 years

 Product Description


The DHPA 2300 is designed to operate as the final amplification
stage for a terrestrial S-band transmitter or repeater system.

It utilizes highly efficient, LDMOS transistor technology to amplify
an S-band input signal to a power level of 400W (56 dBm) while maintaining its linear characteristics. This solid-state design operates in a Doherty configuration over a frequency
range of 2320 MHz to 2345 MHz.

The amplifier incorporates an internal ALC loop to maintain a
constant output power level. The automatic level control (ALC)
the 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.

The amplifier includes an adaptive non-linear pre-corrector,
which effectively pre-distorts the input drive signal to minimize
amplifier distortion and reduce spectral regrowth.

The amplifier is fully protected against input overdrive, output
load VSWR and temperature faults. The protection circuits are
all self-correcting, allowing restoration of the HPA to its normal
operational state upon removal of the fault condition.

The amplifier’s operational parameters are monitored and controlled
by an embedded system controller that can be accessed from an RS485 or RS422 interface.

The DHPA 2300 is a field-replaceable system component that
is designed for indoor installation. The amplifier requires an external
30 VDC power supply and must be forced air-cooled using fans which provide an airflow of 700 CFM.

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