This antenna below is a construction of an Yagi antenna calculated for the FM broadcasting band 88 - 108 MHz. The central frequency used for 100MHz. You can extrapolate easily below for others frequency grace to values of diagrams. This antenna is less difficult to construct than the one presented on the previous page.
Description
The goal of this page is to help you to construct an antenna, not to make the theory of this one, theory complex strong to staying it. Here are some definitions of basis therefore. The name of axis of an antenna call the BOOM. The antenna uses a dipole says " trombone " that is the only element a few delicate to achieve. Contrary to what lets believe diagrams above the two tubes of the trombone are not to dish " but disposed perpendicularly to the axis of the antenna. On the photo below taken perpendicularly to the antenna one doesn't see the two tubes, but in " alone appearance " one. Directors increase the directivity of the antenna (sense of the arrow) but as the gain, it is because of them that with 4 elements the antenna to a Gain of 6dB and 5 elements procures a Gain of 8dB. The reflector return the bundle of wave " collected " by directors toward the dipole, but his major role is to protect the antenna against the parasitic signals coming from the rear. In any case an antenna must be raised in relation to background to work well. 1 to 2 length of work wave is counseled. For F = 100 MHz, the Length of wave is 3Meters (9.85 feet).Source: Radio Meteor
See more: FM Transmitter
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