250W FM Broadcasting


250 Watts up to 45 miles

250 Watts with a high performance well installed antenna is a typical set up for a local radio station for a big town or small city. In rural areas up to 40 miles range is possible.

Five Years Warranty

Aareff FIVE YEARS !!! Warranty

We are so confident this amplifier won't let you down, it comes with a limited 5 YEARS!!! warranty
(see warranty conditions)

24/7 Non-Stop in High Temperature

This unit is designed with high reliability in mind. The cooling system incorporates one front 80mm fan to force cool the RF heatsinks and two 60 mm fans extracting from them. There is an additional 60mm fan to cool the power supplies. The amplifier is cool to touch by hand, even when we tested it in Spain, in summer, outside at ambient temperatures in excess of 40C. To maintain long term reliability the power amplifiers are fitted with two 150 watt Mosfets. This gives generous power headroom and the capability of Non-Stop high reliability operation anywhere in the world.

Full High SWR Protection

During severe antenna reflections (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 antenna becomes good again, full power automatically restores. The front panel has a meter lit up in blue to indicate forward and reflected power. This protection for SWR and reflected power works for any duration of time.


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, 2 Way Stacked Dipole, 4 Way Stacked Dipole, 8 Way Stacked Dipole or Circular/Mixed antennas.

EU/CE and FCC Technical Standards

250wntap 250w fm broadcast amplifier 10 pole low pass filter.jpg

Each amplifier block uses separate 10 pole low pass filters which are then joined together with a lumped LC version of the Wilkinson combiner configuration. This is brutal filtering ensuring no harmonics or out of band spurious get to the the output. This guarantees the spurious and harmonic signals remain within the tough EU spec of -75dB rtc. (Sec 4.11.1 ETS 300 384), this in turn easily puts them within the FCC and Industry Canada spec.

Do You Have A Question?

Click here for user manual

Truly Plug and Play

Unlike other power amps on the market, this unit is complete, tested and ready to use on delivery. The internal power supply accepts 90 to 260V AC making it suitable for use in all countries of the world. Just hook up the amplifier to your antenna, transmitter drive and mains power supply. Never take off the lid, no tuning needed, no test equipment required. This unit is truly plug and play. It is suitable for use with all our 1W drivers and possibly other manufacturers 1W transmitter drivers, you would need to check this with us.

Love Our Work and Company

We are absolutely passionate about the products we build and we try and think of everything we can do with our designs to make it easier and reliable for the customer. We are not the best sales people, but we are great engineers, so if you have any technical questions please feel free to email us.

RF Technical Specifications

RF Power Output Adjustable from 1W to full output 250W
Spurious Emissions -75 dBc EU ETS300384
Harmonic Emissions -70 dBc EU ETS300384
Power Output Adj. 0.01 to 1 Watt 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
SWR Protected any condition EU ETS300384
RF O/P Connector N type
Wideband 87.5 - 108 MHz at 250W min.
Physical Dimensions 2U 300 x 483 x 89 mm
Input VSWR < 1.3 from 87.5 to 108 MHz

AC Technical Specification

Model RSP-320-24 x 2
Input Voltage 88 ~ 264VAC 124 ~ 370VDC 47-63 Hz
Power Factor PF more than 0.95/230VAC PF more than 0.98/115VAC at full load
Efficiency 87%
Input Power 50W max. for 250W RF OUT with RF SWR less than 1.5
Working Humidity 20-90% RH non-condensing
Safety Standards UL60950-1, TUV EN60950-1 approved
EMC Emission Compliance to EN55022 (CISPR22) Class B, EN61000-3-2,-3
EMC Immunity Compliance to EN61000-4-2,3,4,5,6,8,11, EN55024, light industry level, criteria A