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How Can I extend my FM transmitter range?

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Hi there, :o
Actually, this is my first post here " Hope it to be the first step to the millions" :-[
I've constructed one project similar to those under FM transmitters in the website's project section and what I want to do is trying to extend the range. Should I have more power or play a little with the antenna?

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The best way is to use a FM Linear like this:

Linear FM 30Watt : http://www.electronics-lab.com/projects/rf/010/index.html

This circuit connects to the output of your transmiter and it is able to make a 4-5W transmitter to 25-30W one.

Alternative you can use a FM antenna booster (active antenna) like this: http://www.electronics-lab.com/projects/rf/022/index.html

About the anntenas you can read this article: http://www.scott-inc.com/html/fmant.htm

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