100W Professional FM Radio Transmitter

Like all our transmitters, this has a simple looking exterior, inside is another story. The 100 watt transmitter has a very high specification and is more than a match in technical quality to any of the other professional broadcast transmitters on the market at much higher prices. By not including frills and other gimmicks that don't improve the sound quality or reliability, we can make this transmitter at a price that is affordable. This and the previous model have been on the market for over 20 years !! and have endured countries of the world with the worst environments and the hottest climates and worked flawlessly without any problems.

Which Version Do You Need?

These are the two main versions of this transmitter:

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

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 100 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.

MPX Input

Antennas

This transmitter can be used with any of the following antennas:

    • SINGLE DIPOLE
    • 4.8dBi 2 DIPOLES
    • 7.8dBi 4 DIPOLES
    • 10.8dBi 8 DIPOLES
    • 4.8dBi 5/8 ANTENNA
    • CIRCULAR DIPOLE
    • FOLDED DIPOLE
    • MAG MOUNT

Our system package the 250W EIRP system includes this transmitter with a 2 way stacked dipole antenna and 20mt of low loss LMR400 cable to give you a full system that will comply with the regulations of the European Union and most other countries in the world.

VSWR Protection

This transmitter is FULLY PROTECTED and under severe load mismatch conditions (poor SWR, Return Loss) the amplifier will automatically foldback the power to a safe level to protect itself, the antenna and cables from damage. When the load becomes good, full power automatically restores. On the front panel is a neat little meter lit up with intense blue LED's to indicate forward and reflected power and a true frequency counter. The amplifier is fully protected from bad SWR and reflected power for any duration of time.

Temperature Protection

This unit is designed with high reliability in mind. The cooling system incorporates. Two 60 mm fans keep the heatsinks in this unit cool to touch by hand, even when we tested it in Spain in summer at ambient temperatures in excess of 40 deg C. To maintain long term RF Output reliability the linear power amplifier is fitted with a 150 watt Mosfet Device. Due to this design the 100 watt transmitter is capable of Non-Stop Operation anywhere in the world with high reliability.

Construction

The enclosure is made in strong 16 gauge steel, powder coated and baked in satin black. This leaves a tough, durable surface that will never rot or corrode and be cleaned to shine for decades. The front panel is 19 inch across and 2U (3.5 inch) high with a depth of 12 inches, so it will fit with ease into a standard rack. It is very strong and difficult to damage even under extreme handling.

Frequency, Power and Deviation

The frequency and power level is easy to change, but not so easy that somebody with no experience can just press a button on the front, that would be too easy and dangerous. We reached a compromise with this, we placed these controls on the underside of the unit. To get to them, just slide the unit out of the rack, flip it over and the little dip switches will allow you to change the frequency and a trim pots for the power and deviation level.