This is about as big as it gets, there are not many systems bigger than this and even if there are, it's pretty difficult to exceed the 200km distance with any amount of power due to the earths curvature. With the antennas mounted on a high mast on high ground we have had reports from clients saying they have received calls from listeners up to 200km away. Admittedly, this distance is the extreme limit of 100kW, but is absolutely possible. Normal reception would be about half this clocking in about about 100km when you take the average radio, terrain etc. into account. But remember, power is not always about distance, power is sometimes required to penetrate the dense construction in some cities with tall concrete and steel buildings. Some of the large mega stations in the US use this power level, in the Los Angeles alone KBIG, KLOS and KTWV use this power level.
The actual real raw power for the 100kW EIRP system is 8kW RMS of RF. This is obtained from eight 1000 watt amplifiers which are combined together to produce the 8000 watts. To the best of our knowledge no other manufacturer does it this way, we are unique in this. Other manufacturers make just a single amplifier of 8kW, but a single unit for all this power has a serious flaw, if it fails or needs servicing, the station is 'off air', 'game over' so to speak. If our system fails or needs servicing, only one amplifier will go down, leaving 87.5% of the power still operational which is a drop that would not even be noticed by the listener.
This is where the magic happens, this huge eight way antenna transforms the transmitter power by 10 times to 100kW 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 eight way antenna will be exactly the same and indistinguishable from the signal voltage of a 100kW transmitter using just one dipole antenna. The power is effectively identical, hence the name Effective Isotropic Radiated Power (EIRP).
The 40 metre antenna cables (130 feet) connect each amplifier with big 7-16 DIN connectors to the high powered folded dipole antennas. The LMR600 cable is low loss high quality foam type. If you need more than 40m, no problem, there will be a small extra cost, just send us a message and we will provide you with the price and proforma.
|1||FM Stereo Driver with Audio Processing|
|1||8 Way Distribution Splitter Amplifier|
|8||1000W FM Power Amplifier|
|8||LMR600 40m /131ft Cables|
|1||All Other Connecting Cables|
|8||Broadband High Power Folded Dipole Antenna with Tower Mounting Clamps|
The FM signal starts in the internal Veronica PLL which produces the super low noise and highly stable FM signal. You can find more info on this at in our 1W Exciter (PLL version 10). Then the internal stereo coder and audio processor boards provide a loud and crisp audio signal on the listeners radio. If your more of an expert, you can if you want use an external processor such as Orban, Inovonics or PC generated MPX/RDS, the limiter and stereo coder we supply can be completely disabled.
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.
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
This graph is based on average maximum customer reports in some directions. Basically this shows the maximum ranges really ever recorded. Most of the reports were radio station listeners that phoned, texted, Whatsapp etc into the radio station programs operated by our customers.