What is the relation between antenna length and wavelength?
The length of the antenna is inversely proportional to the frequency and directly proportional to the wavelength. The higher the frequency and the shorter the wavelength, the shorter the antenna can be made.
How long should an FM transmitter antenna be?
about 150 cms
The overall length for the antenna should be about 150 cms, i.e. each leg should be 75 cms. This length should make the resonant frequency fall slightly in the lower half of the FM broadcast band, but often the more popular stations may be found in this region.
How is antenna length determined?
Basic calculation is the speed of light divided by the frequency. Say of an airband antenna to receive 125 MHz then it is 300/125 = 2.4 meters full wave length. Commonly, but not exclusively, antennas are either a ½ wave dipole hence 1.2 meters or a ¼ wave monopole hence 60cm in length.
Can antenna be of any length?
In general yes, it can be any “reasonable” length (e.g. not infinite). The principle of antenna is based on Electrical resonance , the efficiency depends (beside other factors) on the Electrical length of the antenna and the frequency of the signal (and tons of other factors) – See Resonance .
In which type & antenna length is not multiple of λ 2?
Explanation: Short monopoles have length less than λ/8 and the current distribution is triangular. Short dipole has length less than λ/2. Half-wave dipoles have length equal to λ/2. Quarter-wave monopoles have length equal to λ/4.
How far can a FM transmitter transmit?
They are often used in cars but may also be in fixed locations such as broadcasting from a computer sound card throughout a building. Being low-powered, most transmitters typically have a short range of 100–300 feet (30–100 metres), depending on the quality of the receiver, obstructions and elevation.
How long is a 40m dipole antenna?
40m loaded dipole – This is an short dipole for 7 MHz. Total length of this dipole is just 10 meters, 33 feet. Missing lenght is balanced by a coil made of 49 turns of a 40mm diameter pvc pipe.
What is the length of a 72Mhz antenna?
A full wavelength at 72mhz is about 13.6 ft for a quarterwave antenna of 3.4 feet. Dividing this down to 1/8 wavelength gives 50mhz at 2.5 feet and 72mhz at 1.7 feet. You can divide this in half again to get 1/16 wavelength antenna lengths.
What is the length of a quarter wave antenna?
A full wavelength at 50mhz is almost 20 feet giving a quarterwave antenna length of almost 5 feet. A full wavelength at 72mhz is about 13.6 ft for a quarterwave antenna of 3.4 feet.
What is the frequency range from 72 MHz to 60 MHz?
We now have frequencies starting at 72.010 MHz, and then spaced 20 KHz away is our next frequency, 72.030 MHz. This spacing continues throughout the band to give us Channel 11 (72.010 MHz) through Channel 60 (72.990 MHz).
Is 72 MHz still a good frequency for RC aircraft?
Although a company may not be making new equipment on 72 MHz, there is a large amount of it available, and good bargain hunters can save money while obtaining a quality RC system. The AMA has not changed its stance on 72 MHz equipment, and will continue to work with the FCC to keep 72 MHz, as well as the other frequencies, available to modelers.