2006-12-05 13:22:36 · 4 answers · asked by DAVID B 1 in Science & Mathematics ➔ Engineering
Practical answers:
For a 1/4 wave vertical or ground plane antenna the formula is:
234/Freq in Mhz=length in feet.
234/88.5= 2.664 or 2ft 7 3/4 In approx
Simply double that for a 1/2 wave dipole (vert. or horiz).
Now these are good starting points, you will have to tweak the final design with an SWR Bridge.
2006-12-05 19:58:07 · answer #1 · answered by charley128 5 · 0⤊ 0⤋
Fm Transmitter Antenna Length
2016-12-17 15:20:45 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Partial answer:
Some fraction of a wavelength, but it depends on the type of antenna.
frequency times wavelength equals propagation speed
For electromagnetic waves, the propagation speed is the speed of light, or 3E8 meters per second.
One wavelength is 3x10^8 / 88.5x10^6 = 3.39 meters
Antennas are often quarter wavelength, half wavelength or full wavelength.
There is a catch with all of this simplicity, The transmitted wave does not propagate along the antenna at this speed, so the antenna will usually be somewhat shorter. The speed in the antenna is dependent on how the antenna is constructed and is called the "velocity factor". Antenna design is actually quite complicated.
2006-12-05 14:52:02 · answer #3 · answered by Ron E 5 · 0⤊ 0⤋
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2016-12-18 08:07:28 · answer #4 · answered by ? 3 · 0⤊ 0⤋