Low Power Radio on Amazon

All the fun of low power radio with the service and satisfaction guarantee of Amazon. Try our pages dedicated to
Low Power Radio on Amazon.com



Increasing range - better RF grounding for low power AM transmitters

In the second of of three articles on increasing range, we'll go to ground. Low power AM broadcasters can significantly improve range by installing an effective Radio Frequency (RF) ground system. The signal leaving the antenna is only half (or less) of the potential signal output of a low power AM transmitter. A well constructed RF ground can provide the other half and increase both range and signal penetration.
     Listeners tuning in to low power AM broadcasts are usually receiving our ground wave rather than sky wave so better ground, more ground wave.  So how does a broadcaster construct an effective ground?
    A good place to start is where you're at.  A good RF ground system depends, in part, on a natural phenomenon called "ground conductivity." This refers to the electrical properties of minerals in the local soil. Knowing what kind of soil conditions you are working with can help you plan your efforts. 
     Read more at the FCC web site page titled Map of Effective Ground Conductivity in the USA. The higher the number, the easier your grounding efforts will be. One station operator in central California reported "This low power AM stuff is a snap - a base loaded antenna and a 4 foot ground rod and I'm getting a half mile range!" but his ground conductivity was a coveted "30." Those of us working with a "2" or a "4" have to do a bit more work.
    One last technical note and caution - true RF grounds should not radiate. Most conductors carrying RF current will radiate if not buried in the earth. This phenomenon means a long ground lead can cause compliance problems with the FCC.
     Instead of constructing an antenna with a ground, you might inadvertently build something engineers call an "off-center fed dipole." Building an off-center fed dipole could earn an FCC citation, like this one: FCC Citation for Excessive Ground Lead.
     The effort and expense of improving the grounding of a low power AM transmitter will pay off with a better signal.

No comments:

Get on the Air with One Click, Buy a Transmitter Bundle from Amazon.com

Many hobbyists agree that the F-S variable power 0.1 to 0.5 W FM Transmitter is one of the best transmitters for the price.  Add the convenience of a selection of premium quality accessories and you can literally be on the air with a single click.
     No need to search the web for FM broadcast antenna, FM transmitter antenna plans or FM broadcast antenna diy, this great combo includes an F-S Electronics RangeBooster 2.0 Ground Plane Antenna. 
     Connect your antenna to the transmitter with your included ultra low-loss  (55.4 db/100m), 8 mm diameter,  rugged class 8D broadcasting cable and add your programming with the included 6 foot heavy duty stereo audio cable. 
     Necessary adapters are included, too - a simple and cost-effective solution to increase your range, minimize signal loss and maximize your broadcasting enjoyment.
     Peace of mind with the lifetime warranty.

Check out these reviews from real users:

• "All components of the bundle are high quality."
• "The Rangebooster antenna definitely extends the range"
• "Signal goes through brick-metal buildings and embankments as if they were not there"
• "The transmitter unit defaults to .1 watts which is how I've been using it."
• "I am able to get more range with the external antenna"
• "Set up was so easy. The sound quality was awesome. I love this transmitter!"
• "The transmitter works well given I am out in the 'bush' away from town"
• "Worked great right out of the box. Very pleased!!"
• "It is a very compact and easy to use transmitter with impressive stereo fidelity"

So quit wishing and waiting, quit struggling with inferior approaches and “Git er dun!”
Click below to order direct from Amazon.com
Bundle Deal #1: F-S 0.1 - 0.5 Watt Long Range FM Transmitter, RangeBooster 2.0 Professional Grade Antenna Kit, Broadcasting and Audio Cables ($300 value!)

Bundle Deal #2: 0.5 W Fail-Safe Long Range FM Transmitter FS CZH-05B + Rangemax 1.0 Antenna ($200 value!)
Bundle Deal #3: Fail-Safe 0.5 W Long Range FM Transmitter + 1/4 Wave GP Antenna Kit ($200 value!)
Power Blaster Bundle Deal #4: Fail-Safe RangeStud 15 WATT FM Transmitter + RangeMax Professional Grade Antenna ($400 value!)