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2.5kW EIRP Complete FM Radio Transmitter Broadcasting System
How Far Will 2.5kW Reach?
This type of power and antenna should be mounted on a least a two story building and on top of a 12ft / 3.5mt pole. If this condition is met and the building is on high ground, then up to 85km is possible with high quality radio receivers, Expect about half this range with lower quality radio receivers. More on FM TRANSMISSION RANGE
1kW FM Stereo Transmitter
The crisp clear FM signal starts in this unit which provides 1000W super clean output in stereo with audio processing and limiting. For a small, but with a need to be quite powerful radio service, a big town for example, this transmitter is just the ticket with everything required included. More info on the 1000W Transmitter
The Aareff 'Plug-and-Play' Advantage
| System Component | Engineering Specification | Broadcaster Benefit |
|---|---|---|
| 1W FM Exciter | Internal Veronica PLL Driver | Ultra-low noise, high stability, and zero frequency drift. |
| Audio Processing | Integrated Limiter & Compressor | Prevents illegal over-modulation while ensuring loud, crisp audio. |
| Dynamic RDS | Fully Programmable via USB | Displays your Station Name and Artist info directly on car radios. |
| Antenna & Cable | 0dB Dipole + 12m RG58/CU | 1:1 match guarantees exactly 1W EIRP radiation (No tuning needed). |
Includes RDS (Radio Data System)
RDS is now included on all stereo transmitters with audio processing. RDS shows your station name and more scrolling across the car radio display.
This 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 can be programmed to 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.
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Do You Have A Question?
PACKAGE CHECKLIST
| Qty | Description | Item |
| 1 | FM Stereo Driver with Audio Processing |  |
| 1 | 1000W FM Power Amplifier |  |
| 1 | LMR400 20m / 66ft Cable |  |
| 1 | 5/8 Wave 2KW Vertical High Gain FM Broadcasting Antenna |  |
|
LIMITED WARRANTY |
5/8 Wave 4.8dBi Gain Antenna
Almost like magic the 5/8 WAVE ANTENNA transforms the transmitter power by 3 times to 2.5kW and this is even after taking the cable losses into account. This transformed signal is effective radiation, what it means is that if you stand at the horizon many miles away, the signal voltage with this antenna will be exactly the same and indistinguishable from the signal voltage of a 2.5kW transmitter using just one dipole antenna. The power is effectively identical, hence the name EFFECTIVE ISOTROPIC RADIATED POWER (EIRP).
20 Metre (66 Feet) Antenna Cable
This package uses 66ft / 20mt of LMR400 antenna cable. The loss on this cable and plus the antenna gain actually results in an EIRP of over 2500 watts.
2.5kW Maximum FM Transmission Range Chart: Real-World Listener Data
Understanding Typical Broadcast Coverage
The following range chart is derived from real-world customer reporting, providing a reliable baseline for expected broadcast coverage. This data reflects the typical distances recorded by professional and community stations utilizing our 1W EIRP systems.
- Data Source: Based on average customer signal reports across various geographical environments.
- Verification: Reports are compiled from direct listener communication (phone, text, WhatsApp) to radio stations operated by Aareff customers.
- Zero-Failure Promise: Because this system is perfectly impedance-matched (1W Transmitter to 0dB Dipole), it ensures exactly 1W EIRP is radiated, maximizing range without equipment strain.
It is important to understand that FM transmission range is influenced by numerous variables (e.g., terrain, antenna height, atmospheric conditions, local noise floor). For a detailed breakdown of the factors affecting signal propagation, refer to our dedicated guide on FM Transmission Range.
FM Stereo Audio and Processing: Achieving Loud, Crisp Broadcast Quality
THE SIGNAL FOUNDATION: LOW NOISE AND HIGH STABILITY
The high-quality FM signal begins with the internal Veronica PLL (Phase-Locked Loop) driver, which serves as the 1W Exciter.
• Function: Produces a super low noise and highly stable FM signal.
• Trustworthiness: Using a trusted PLL driver is fundamental to preventing drift and ensuring carrier integrity, a hallmark of professional-grade equipment.
• Resource: More information on this core component can be found in our 1W Exciter (PLL driver)
INTERNAL AUDIO PROCESSING FOR LISTENERS
After the PLL generates the stable carrier, the internal processing boards take over to shape the audio for the best listener experience:
1. Internal Stereo Coder: Generates the FM stereo signal.
2. Internal Audio Processor: Applies dynamic processing (like limiting and compression) to ensure a loud and crisp audio signal on the listener's radio.
PROFESSIONAL FLEXIBILITY: EXTERNAL PROCESSOR INTEGRATION
For expert broadcasters who utilize specialized external equipment, our system offers complete bypass capabilities.
• Integration: If you are an audio professional preferring an external processor (such as Orban, Inovonics, or PC-generated MPX/RDS signals), the system is fully flexible.
• Bypass Capability: The internal limiter, stereo coder, and audio processor boards can be completely disabled.
• Benefit: This flexibility ensures that the signal chain meets the exact, precise specifications and processing signature required by the station's chief engineer.
DECLARATION OF CONFORMITY
European Union
We hereby declare that this equipment complies with;
• ETS 300384 European Telecommunications Harmonised Standard when used with an audio compressor limiter supplied and tested by Aareff
• EN 301489-11 V1.3.1 (2006-05) EMC Electromagnetic Compatibility when used with 1 meter AC mains cord supplied. If the installation engineer needs to extend this cord, this and the audio input cable should be no more than 3 meters in length to remain in compliance with EMC directive.
• 2006/95/EC Directive (2006-12) LVD Low Voltage Directive.
Equipment compliance is possible using equipment from and in conjunction from other manufacturers, but since this is beyond the control of Aareff Systems, Aareff Systems cannot or be expected to guarantee compliance in this situation.
United States
The following list are the FCC technical requirements for FM broadcasting. We confirm and verify that this transmitter complies with the technical requirements.
47 CFR Chapter I Federal Communications Commission sections:
• 73.1560, 2.1046 RF Power
• 73.1545, 2.1055 Frequency Stability
• 73.317, 2.1049 (e)(3) Emission Limitation, Emission Mask
• 73.317, 2.1057, 2.1051 Emission Limits, Spurious Emissions at Antenna Terminal
• 73.317, 2.1057, 2.1053 Emission Limits, Field Strength of Spurious Emissions
