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SRK – FMX4+ – 4W FM Broadcast Exciter

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The FMX4+ is a 4W FM broadcast transmitter/exciter intended primarily for LPON service.

The FMX4+ is a solid state 4W FM exciter designed for FM broadcast service.

The heart of the FMX4+ is a microprocessor controlled, low phase noise, phase locked loop.

This gives excellent audio performance whilst allowing total carrier frequency flexibility.

The signal from the PLL is amplified up to in excess of 4W by a broadband MOSFET stage. One advantage of this technique is a high level of tolerance to reflected power.

The audio input processors incorporate Bessel antialias filters as well as peak limiters.

Central to the operation of the FMX4+ is the microprocessor. Amongst other things, the MPU is responsible for setting carrier frequency as well as the remote control functions.

Forward power, reverse power, peak deviation and carrier frequency are able to be measured and displayed on the front panel or read via the RS232 telemetry function.

All these features and more make the FMX4+ extremely flexible. Over SWR protection is standard.

Each FMX4+ comes complete with extensive documentation covering installation, use, maintenance and trouble shooting.


Output power >4W continuous
Carrier frequency 87.5 to 108.0 MHz
Channel spacing 100 KHz
Carrier stability <1KHz from nominal
Modulation Mono FM 75KHz peak deviation
Audio frequency response 10Hz to 15KHz
Pre-emphasis 75uS, 50uS or none
Distortion <0.1%
Audio SNR >75dB
Mono separation >40dB
Line voltage 240VAC +/-15%
Line power <30VA
Audio input level -10dBm to +10dBm
Audio input impedance 10K un-balanced
Protection Over SWR
Physical dimensions (approx) Width 500mm x Depth 250mm x Height 44mm
Weight (approx) <4Kg
Cooling Convection
Input audio connector RCA female
Input line connector IEC male
Output RF connector N female