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

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

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.


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.

Stereo and Audio Processor

Signal To Noise Ratio

Frequency Response

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

(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


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