In radio frequency (RF) terminology, the Very High Frequency (VHF) range is the signal spectrum from 30 to 300 megahertz (MHz). The measurements below are for building a simple Dipole Antenna. Place a 1:1 Balun on the Antenna end of the Feedline. A simple dipole antenna can be used for improved FM broadcast signals. REVISION NOTE: We had a note from James, KB5YN, pointing out that one of my so-called GOOD numbers was 220 feet. 2. The Wire Size can range from 16 AWG to 12 AWG. Enter one (only one) value, the desired frequency or the antenna length in any length field. To receive a specific VHF signal, you simply need a dipole antenna. All antenna lengths in the information below are in feet and are the results based on the standard formula of 468 / FMhz = total length … The formula for calculating the approximate length of a dipole is: Dipole length in feet: 468 / frequency in MHz. The results are conveniently displayed in inches, centimeters, feet and meters. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. The FM band runs from 88 to 108 MHz, and dipole antennas amplify a center frequency with the amplification factor decreasing on either side of the center frequency. Therefore, you need to use 98 as the center frequency to maximize your antenna function. In practice it's best to make the antenna a little longer than the calculated value and then trim it to get the best SWR value. The total length of the antenna is 4.77 feet, with each piece 2.39 feet. These are only approximate values. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. Dipole Antenna Calculator. Here are the final numbers (in my opinion) in green below that would be good for a long-wire antenna: (You may want to make a note of them) REVISED: 29 35.5 41 58 71 84 107 119 148 203 347 407 423. The larger the wire, the wider the bandwidth. The most widely used formula to calculate the approximate overall length of wire required for a dipole is: 468 / frequency (MHz) = length of wire in feet. The lengths of dipoles, reflectors, and directors for various frequencies is given in megacycles in the chart of Fig. Ham Radio HF/VHF Antenna Lengths Chart. Click on Calculate and the opposite value will be displayed in feet and inches or frequency in megahertz (Mhz). Welding Leg Flanges to a New LAMBDA® Optimized FM Mounting System New Top-Mounted UHF TRASAR® Television Antenna in Fabrication Another 16-Bay AXIOM® Master FM Antenna … This calculator is designed to give the vertical length (height) of a particular whip type antenna, or the frequency of it. In order for an FM antenna to perform at the level for which it is designed, it is necessary to tune it to a normalized return loss of –25 dB or better (equating to a VSWR of about 1.11:1) over the station’s entire 200 kHz channel (if the station is licensed for, say, 100.7 MHz, its channel runs from 100.6 through 100.8 MHz). Here is a handy chart for determing 1/4 wave verticals, 1/2 wave dipoles, and full wave loop lengths. Dipole length in meters: 143 / frequency in MHz. It has a nominal 3 dB gain over an isotropic source and is directional, tending to favor signals broadside to the wire. A dipole is basically a length of conductor (wire) split into two portions and signal is taken off at the split. To calculate the dimensions of an antenna for the center of the FM band (call it 98 mc) for example we read across from 98 mc on the left-hand side of the chart until the horizontal line strikes the curve, marked dipole, then look down to length in inches. The length of a dipole is the main consideration for determining its operating frequency, and as a result, calculating the length is a key element of designing and installing any dipole antenna whether for HF, VHF, or UHF, etc..
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