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600W Professional FM Radio Transmitter

600W Professional FM Radio Transmitter. Overview
5 Years! Warranty

Inc. Delivery to UNITED STATES

Constructed in a 16 gauge steel black powdered coated enclosure, this unit is built to last!! for long time! The audio processor version with RDS has true transformer balanced inputs that eliminate any possible ground loops and hums from the audio keeping it clean and noise free. This ideal for that station that needs quite a bit of power, but doesn't need complications, just one enclosure with everything taken care of. If 600 watts is too much, the power can be adjusted to be anything between 600 watts and virtually zero watts.

Which Version Do You Need?

These are the two main versions of this transmitter:

◼ Stereo with RDS and Audio Processing Version

◼ MPX Version

These two versions cover 90% of all customer requirements. Other custom versions are available such as stereo only, no RDS, no processing etc. which we can also make if that's what you require.

You will find these two main versions shown in detail in the two following sections with descriptions of what they do and how they work. You should also see the price, INCLUDING delivery, to your country.

If you are still unsure, you are always welcome to contact us at em: info@aareff.com or ws: +1 829 6980733 and we're more than happy to advise you.

Stereo, RDS and Audio Processing Version

US$ 2855

If you are not sure which version you want, then you definitely need this version. It is perfect for beginners because it adjusts the audio levels automatically and keeps the 600 watt transmitter within the legal specifications required by the state regulator.

This version is also ideal for professionals who just don't need the all the hassle. This is because it includes everything in one enclosure. The audio processing keeps the audio level 'LOUD', but not too loud whereby it causes over deviation and contravenes your permit. The trick is to get the sound as loud as possible so you can compete with the other stations on the dial, but at the same time keeping your signal legal. This is a tricky balance to maintain, but this version in stereo with our internal audio processers does exactly this.

600W Professional FM Radio Transmitter Stereo Audio and Processing

In addition, this version INCLUDES RDS. This allows everybody to see your station name and more scrolling across the car radio display.

The RDS is not just ordinary RDS, it is fully programmable dynamic RDS. This means the transmitter can be connected to a PC by a USB cable. The transmitters RDS circuit will pick the Artist and Song name from any folder on the PC disk drive. This folder is easy to set up in the DJ playout software, like Zara Studio etc. You can find more information about this in the Aareff RDS User Manual.

MPX Input

US$ 2054

We have this version available for Users with experience that prefer straight raw MPX input.

Low frequency audio response is the holy grail for multiband audio processors, they need it.

As you can see from the image, the 160Hz square wave is very square with no tilting making it perfect for use with Orban, Inovonics, Omnia, Stereo Tool and other commercial audio processors.

600W Professional FM Radio Transmitter MPX 160Hz Tilt Test with MPX Tool


The transmitter will work with any 50 ohm antenna rated at 600 watt or higher. The following antennas when used with this 600 watt transmitter will radiate (EIRP) the approximate power shown.

    • Vertical 5/8 Wave 1.5kW EIRP
    • Circular Dipole up to 3kW EIRP
    • Folded Dipole up to 6kW EIRP

Temperature Protection

The 600 watt as with all our transmitters feature variable and linear temperature protection, this means it just doesn't shutdown when it gets hot, instead the power backs of gently to prevent the internal heatsink exceeding 70C. This will only occur if the ambient temperature exceeds 40C, the fans and vents are blocked or if the internal fans fail for any reason, this is highly unlikely unless the fans are very old and have been abused by never cleaning them. C.

VSWR Protection

This 600 watt transmitter output is bullet proof using the LDMOS BLF184XR. The manufacturer of the LDMOS says that XR means 'eXtremely Rugged' and so far from our experience this has proved to be correct. LDMOS RF power transistors are designed for the most challenging engineering environments and withstand severe load mismatches, this combined with our VSWR reflected power protection circuits keep this transmitter alive in the most extreme circumstances. Just the same as the temperature protection, the VSWR protection backs of the power gently to a safe level, there's no abrupt cut-off or shutdown.


This single 3U enclosure is in strong 16-gauge steel, powder coated and baked in satin black. It's super strong to the level of combat strength with no flimsy thin paneling like Chinese products. The powder coating protects the surface from deep scratches which in turn prevents exposed steel and rust. The front panel is 19 inches and will fit perfectly in a standard 19 inches rack.


When we test this unit we need to test it at some frequency, it's obviously better if we test it at the frequency you want to us it on, then you can use it straight out of the box on delivery. But if you don't know the frequency, that's okay, the frequency, FM deviation and power is easy to set in a few minutes on the underside panel controls.


The stereo version with audio processing and limiting meets all the regulatory standards required out of the box and pre configured. In fact if you send us a copy of your permit and it's conditions, we will set it up exactly to the specification. This equipment complies with EU/CE harmonised standards and FCC technical requirements for FM broadcasting. More information HERE

User Manual

RF Specification

All stated measurements were made at 220VAC at 27 Deg. Celsius ambient temperature unless stated.

Power Output Adj. 1-600 Watts into 50 ohms
Spurious Emissions Less than -75 dB ref to carrier
Harmonic Emissions Less than -70 dB ref to carrier
Freq Stability +/- 1 KHz max. typ. +/-300 Hz
Deviation Sensitivity Stability +/-2 % max
Freq Fine Adj > +/- 1000 Hz
Freq Range 87.5 to 108 MHz in 100 KHz steps
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 DIN 7-16
Operating Temp -20 to +40 Deg C

AF Specification

Pre-emphasis (50 uS/ 75 uS/ None) Selectable
Audio Input Connector Phono/ RCA type unbalanced sockets
Audio Input Sensitivity +4 dBu for +/- 75 KHz dev.

Version MPX Stereo and Audio Processor
Signal To Noise Ratio 80dB 65dB
Frequency Response 30Hz-76KHz 30Hz-15KHz
Audio Distortion 0.2% THD Max 0.2% THD Max (at MPX section)

AC Specification

Input Voltage 90-264 V AC 135-370 V DC 47-63 Hz
Input Power 900W for 600W 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 GB17625.1
EMC Immunity Compliance to EN61000-4-2 3 4 5 6 8 11 light industry level criteria A


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