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How does the field strength of a standard broadcast station vary with distance from the antenna?
Wiki User
∙ 14y ago
The simplest answer to this question would be that in free space the path loss between the transmitter and the receiver would equal (4 * pi * the distance in meters * frequency in hertz / the speed of light in meters per second) to the power of 2. If you know the power radiated from the transmitter, you can calculate the signal strength at a receiver a given distance away.
Since free space only exists in theory, formulas for real scenarios get more complex from here but this is a start.
Wiki User
∙ 14y ago
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What is the difference between an omnidirectional and an isotropic antenna?
An omnidirectional antenna can be practically implemented but an isotropic antenna cannot be implemented practically. An isotropic antenna resembles an ideal antenna with ideal values for all parameters.
What is the electromagnetic radiation of 101.8mhz?
Wavelength = (3 x 108) / (1.018 x 108) = 2.95 meters (rounded)Intensity / field strength . . . depends on the FM station's transmitter output power and antenna pattern
How does an antenna pick up waves?
It has bristles or sensers on the antenna. It depends on what bug.
Relation between wave length and size of the antenna?
To decrease antenna height For transmitting a signal of wavelength λ the antenna height must be λ/4. So if we want to send a 1 Hz (λ=3*10^8 m) signal ( very very low frequency) using an antenna , its height must be 75,000 Km ( impossible to build such a huge antenna ). If the same signal is modulated to some high frequency say 88 MHZ ( λ = 3.4 m ) , antenna height needed is 0.8522 m (quite easy to construct !!! ) (88 MHZ is the starting range of Frequency modulation which exists upto 108 MHZ).
What factors determine antenna gain?
It depends upon the type of antenna. For example, a Yagi antenna's gain can be increased by adding elements. A parabolic antenna's gain can be increased by increasing the diameter of the antenna. All antennas can have their gain increased by lowering the loss of the feed line. By replacing regular coaxial cable with nitrogen pressurized coax, the overall gain at the receiving end can be increased. Gain can also be increased by inserting an amplifier between the antenna and the receiver. Another method of increasing gain is to reduce the VSWR, or voltage standing wave ratio.
What is the difference between an active antenna and a standard antenna?
An active antenna has a amplifier built in, a standard antenna does not. AKA powered antenna.
How to unplug old antenna to replace with standard antenna?
"How to unplug old antenna to replace with standard antenna on 1989 SunDance
What type of antenna is best for TV?
The best type of antenna for TV largely depends on your specific circumstances. For urban dwellers, an indoor, non-amplified antenna should be sufficient due to proximity to broadcast towers. However, for those living in rural or remote areas with weaker signals, an outdoor or amplified indoor antenna might be necessary to ensure the reception of a broad range of channels. Always consider factors like distance from broadcast towers, the terrain, and any possible obstructions between you and the towers before deciding on the best antenna for your TV.
Is an Aeriel on the roof a standard or an active antenna?
An active antenna is powered antenna, this includes a RF amplifier and a power supply so it must be "plugged in" somewhere. A standard "passive" antenna has no amplifier.
Does a signal being transmitted from an antenna to a receiving antenna lose strength exponentially?
Yes.
What is direct brodcast?
Direct - direction - to point something at a specific object Broadcast - transmit - to send something from one place to someplace else or multiple places at the same time Direct Broadcast - directional transmission - to send something from one place to specifically someplace else and no where else Example: A radio/tv station transmits it's broadcast from its omnidirectional, or in every direct, antenna A multi-building company transmits it's network connection from one building to another with a directional antenna The advantage of direction broadcast is you can choose where the signal goes and thus who gets it. Also, it tacks less energy for a direction antenna to send the same information over the same distance and the omnidirectional antenna.
Why TV antenna need to point to south?
The tv antenna should point toward the broadcast station's transmitter tower. South has nothing to do with it.
What is a broadcast repeater?
A television repeater can be a TV translator. It receives a distant station thru a receive antenna mounted high on a tower then re-broadcast this signal from transmit antenna(s) on a different channel, mounted on the same tower.
What does a broadcast transmission do?
A broadcast transmission transfers radio waves through the air which are then picked up by an antenna and converted into either sounds or picture images.
Why dipole antenna not used for high frequency?
Depends on what you mean by high frequency. The rabbit ears antenna used in broadcast TV is a dipole and is used for VHF.
How do you broadcast TV channel?
The original TV was only broadcast TV. It's done the same way as radio us broadcast. Tall antenna towers send out (broadcast) radio waves that send the TV signal long distances.
How does Freeview broadcast their channel to TV's in the local area?
Freeview broadcasts their channels to TV's in the local area by using a digital tuner or a receiver for analogue TVs and a digital set up box. The broadcast is transmitted to local television using an aerial antenna indoor or outdoor depending on signal strength in one's location.
