What should be the height of transmitting antenna if the TV telecast is to cover a radius of 128 Kilometre?

Thus, the height of the tower should be 1280 m.

What should be the height of antenna?

The ability to communicate over long distances generally requires a low radiation angle, meaning that an antenna must be placed high above the ground in terms of the wavelength of the radio wave being transmitted. A height of 120 feet or even higher will provide even more advantages for long-distance communications.

Is it necessary for a transmitting antenna to be at the same height?

A TV transmitting antenna is 81 m tall. In LOS communication, it is not necessary that transmitting antenna and receiving antenna are at same height. Only requirement is that there must not be any obsacle in between.

What is the height of transmitting antenna for audio frequency?

For proper transfer of signal (modulation) the height of the antenna should be comparable to the wavelength of the signal which is to be transferred (at least one-fourth in length).

Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line of sight communication?

Line-of-sight communication means that there is no physical obstruction between the transmitter and the receiver. In such communications it is not necessary for the transmitting and receiving antennas to be at the same height.

What should be the antenna height for transmission of a signal of wavelength lambda?

For efficient radiation and reception, the height of v transmitting and receiving antennas should be comparable to a quater of wavelength of the frequency used. So for efficient transmission of signals of wavelengths λ the minimum length of antenna should be λ/4.

What is the height of antenna used for TV transmission?

Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? A TV transmitting antenna is 81 m tall.

Can an antenna be too high?

In general, the higher you place your antenna, the better. It would be best to have your antenna placed 30 feet above ground level to give you the clearest over-the-air connection with a tower. If you’re within 30 miles, you can probably get away with a nonamplified antenna and be just fine.

How do you measure antenna length?

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.

Why the minimum height of antenna is lambda by 4?

The point you choose as the feed or tap point determines the impedance. The length of the antenna is 1/4 wave, which can be mounted at any height. It is 1/4 wave because the field is strongest at 1/4 of the wave in a sinusoidal signal. The peaks occur at 1/4 and 3/4, in opposite polarity.

How do you calculate the height of a transmitting antenna?

Solution: The height of transmitting antenna = d 2 2 R. d m a x = 2 R H T = 128 k m. ⇒ H T = 128 2 2 × 6400 = 1280 m. Thus, the height of the tower should be 1280 m.

What is the best height for a long distance antenna?

A height of 120 feet or even higher will provide even more advantages for long-distance communications. To a distant receiving station, a transmitting antenna at 120 feet will provide the effect of approximately 8 to 10 times more transmitting power than the same antenna at 35 feet.

Do you need a building permit for a radio tower?

The intended audience is amateur radio operators and the city and town Planning Boards before which a radio amateur must sometimes appear to obtain building permits for radio towers and antennas. The performance of horizontally polarized antennas at heights of 35, 70 and 120 feet is examined in detail.

How does HF radio communication work?

HF radio communications between two points that are separated by more than about 15 to 25 miles depend almost solely on propagation of radio signals through the ionosphere. The ionosphere is a region of the Earth’s upper atmosphere that is ionized primarily by ultraviolet rays from the Sun.