AM 2500

FM Amplifiers Solid State โดย OMB

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AM 2500 is a Solid State R.F. Power Amplifier designed to operate both in the CCIR Frequency Band II, (from 87.5MHz to 108.0MHz), and for the FM Broadcasting Service of FCC (from 88 to 108MHz).  It's a sturdy, rugged device requiring only 30W approximately of driving RF power to deliver a full output power of 2.5kW over a 50Ω load.

OMB recommends the use of the outstanding EM-25DIG or the EM-20/30DIG FM Modulator-Exciters together with the AM 2500, forming EM 2500 transmitter, in order to get a highly reliable FM transmitter equipment, able to broadcast high quality stereophonic signals.

AM 2500 includes eight 375W high-efficiency MOSFET technology amplifying modules, fed by 2 independent switching power supplies, which are made to withstand the working conditions.

The amplifiying modules works independently thanks to a power combining structure that provides high isolation between them.
 
The equipment includes a low-pass filter at the antenna output, EMI filters at the utility connection and an internal transient suppressor. The LCD display shows the amplifier main parameters: supply voltages, 8 module currents, direct, reflected and input power, power loss in the internal unbalance load and three temperature sensors.

The amplifier control system stores in their memory all events and alarms detected, showing time and date of occurrence.

AM 2500 includes a Smart temperature protection, Reflected power protection and Automatic gain control.

The amplifier includes Analogue Telemetry (Direct and Reflected power measure), Digital RS-232 telemetry and remote control, Remote control through open-close contacts and a Multi-device bus connection for internal use.