1 Watt FM Transmitter / Driver / Exciter

MPX Version

This is the low cost version, but is not intended for the novice or beginners. The audio input is raw MPX without any audio limiting or stereo coder circuitry, this must be provided externally in accordance with the recommendations of http://www.aareff.com/ETR132.pdf. Many of our customers use this with Optimod type processors or software generated Stereo and RDS systems.

Stereo Version

This is identical to Mono/MPX version but with a stereo coder built in. RDS cannot be used with this. Again it does not include audio limiting, so it's not recommended for the novice or beginner. External limiting need to comply with the recommendations of http://www.aareff.com/ETR132.pdf

Mono and Audio Processing

This particular version is in mono only, so it not suitable for music stations. This would be used for talk stations, church broadcast etc. It includes audio processing circuitry and suitable limiting to keep the transmitter in compliance with the maximum bandwidth permitted by the international regulations and is suitable for the novice or beginner.

Stereo and Audio Processing

Most small radio stations and beginners will use this version, this is because it includes audio processing circuitry and suitable limiting to keep the transmitter in compliance with the maximum bandwidth permitted by the international regulations. There is also access to the MPX in and out on the back panel which allows all known RDS units to be connected.

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All these models comply with European standards ETS 300384 for R&TTE, EN 301 489-11 for EMC and (LVD) 2006/95/EC for safety, the relevant FCC sections of US 47 CFR Part 73 for verification and ITU-R BS.450-3 (11/01) FM Broadcasting at VHF.

RF Technical Specifications

Audio Input Sensitivity +4 dBu for +/- 75 KHz dev.
Freq Stability +/- 1 KHz max. typ. +/-300 Hz
Deviation Sensitivity Stability +/-2 % max
Freq Fine Adj > +/- 1000 Hz
Pre-emphasis (50 uS/ 75 uS/ None) Selectable
Audio Input Connector Phono/ RCA type unbalanced sockets
Power Output Adj. 10mW to 1200mW into 50 ohms
Freq Range 87.5 to 108 MHz in 100 KHz steps
Spurious Emissions Less than -63 dB ref to carrier
Harmonic Emissions Less than -70 dB ref to carrier
Out of Lock RF Muting Less than -63 dB ref to carrier
Residual AM Less than 0.5 %
Synchronous AM Less than 0.5 %
RF Ruggedness Any VSWR phase or length of time
Output Connector BNC
Operating Temp -20 to +40 Deg C

AC Technical Specification

Model GE12 15
Input Voltage 90-264 V AC 135-370 V DC 47-63 Hz
Input Power 9W for 1.2W RF OUT with RF SWR less than 1.5
Output Voltage 15V
Working Humidity 20-90% RH non-condensing
Safety Standards UL60950-1 CSA C22.2 TUV EN60950 -1 AS/NZS 60950.1 CCC GB4943 approved
EMC Emission Compliance to EN55022 EN61000-3-2 3 FCC part15 GB9254 GB17625.1
EMC Immunity Compliance to EN61000-4-2 3 4 5 6 8 11 light industry level criteria A
Version MPX Stereo Mono and Audio Processor Stereo and Audio Processor
Signal To Noise Ratio 80dB 65dB 80dB 65dB
Frequency Response 30Hz-76KHz 30Hz-15KHz 30Hz-15KHz 30Hz-15KHz
Audio Distortion 0.02% THD Max. 0.02% THD Max. 0.02% THD Max (at MPX section) 0.02% THD Max (at MPX section).
RDS Compatible Yes No No Yes


This FM transmitter along with all our other products comes with a two year warranty and our reputation of high reliability. On delivery the equipment is ready to plug in and use with any suitable 50 ohm antenna system such as our Vertical 5/8 Wave, Single Dipole, Stacked Dipole or Circular/Mixed antennas.

Our package 1W ERP and 2.5W ERP system uses this transmitter with our stacked dipole antenna or 5/8 antenna and suitable antenna cable to give you a full system that will comply with the regulations of the European Union and most other countries in the world.


On the underside of this unit controls are accessible to set the:

  • RF power output level anywhere from 1W to 30 W
  • Pre-emphasis to 50 or 75 uS
  • Frequency between 87.5 to 108 MHz

All the versions of this transmitter will operate with a power supply of 12-15V DC (0.6 amps) or worldwide mains 90 to 260V AC.