12 Watt FM Transmitter

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.


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


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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Compliance

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.

Operation

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

  • RF power output level anywhere from 1W to 12 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 (2.5 amps) or worldwide mains 90 to 260V AC.

Version MPX Stereo Stereo and Audio Processor
Signal To Noise Ratio 80dB 65dB 65dB
Frequency Response 30Hz-76KHz 30Hz-15KHz 30Hz-15KHz
Audio Distortion 0.02% THD Max. 0.02% THD Max. 0.02% THD Max (at MPX section).

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. 1-12 Watts into 50 ohms
Freq Range 87.5 to 108 MHz in 100 KHz steps
Spurious Emissions Less than -75 dB ref to carrier
Harmonic Emissions Less than -70 dB ref to carrier
Out of Lock RF Muting Less than -70 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 SO239 (or optional N type)
Input Connector BNC 50 ohms
Operating Temp -20 to +40 Deg C

AC Technical Specification

Model GST60A
Input Voltage 90-264 V AC 135-370 V DC 47-63 Hz
Input Power 30W for 12W RF OUT with RF SWR less than 1.5
Working Humidity 20-90% RH non-condensing
Safety Standards UL60950-1 TUV EN60950-1 BSMI CNS14336 CCC GB4943 J60950-1 approved
EMC Emission Compliance to EN55022 class B EN61000-3-2 3 FCC PART 15 / CISPR22 class B CNS13438 class B GB9254 GB17625.1
EMC Immunity Compliance to EN61000-4-2 3 4 5 6 8 11 light industry level criteria A