On open rural land with good antenna height you can expect 50kW EIRP to reach 70 miles, maybe a little more. In a dense city like New York with tall buildings made of steel and concrete, this would cause great attenuation to the signal and reduce the coverage area by 10 times, you could expect only a few miles. So, the transmission distance really depends on many factors. If you send us the GPS coordinates of your antenna site and the antenna height, we can make a plot of you using satellite elevation data of where the signal can be received. We have a great example of this HERE
The raw power being generated by the transmitter and amplifiers is 4kW or 4000 watts. This is done by using four 1kW amplifiers as shown in the picture. The power from each amplifier is combined or summed together, in phase, to produce the 4kW of power. It's possible to switch off at any point and even remove a 1kW amplifier leaving three 1kW amplifiers and a total of 3kW of power still operating. This has great benefit for being able to service, clean etc. an amplifier without taking the station 'Off Air'. In such an event the radio station power going from 4kW to 3kW would only be a 25% reduction and not noticeable by most listeners.
In these systems the antenna is everything, you must treat the antenna like your best friend, even a brother (sister too! for the pc sensitive). The antenna just looks like lumps and rods of aluminum screwed together, and it is! but it is much more, the antennas length, shape, installation and height dictate if you signal is going to do tens of miles or less than one mile. The antenna is more important than the transmitter and amplifiers. This antenna system uses eight folded dipoles optimally spaced to produce 12dBi of gain. Cut short, this multiplies the signal pointing to the horizon by 12.5 times resulting in 50kW EIRP transmission signal.
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||4 Way Distribution Splitter Amplifier|
|4||1000W FM Power Amplifier|
|4||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.