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The size of an antenna depends upon the frequecny of the RF signal and the gain.

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Q: The of an antenna depends upon the frequency of the RF signal and the gain?
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Up to which frequency does the gain of an antenna increase as the frequency increases?

In general, an antenna is "cut" or "built" for one frequency, or for a band of frequencies centering on one particular frequency. This antenna will respond to all frequencies, but will only exhibit "maximum" gain at one frequency. Frequencies higher or lower will not be received quite as well, and the farther from the "tuned" or "center" frequency the signal is, the less gain the antenna will provide on that frequency. As we work with an omnidirectional antenna, we can "tinker" with it a bit in an attempt to get it to work with a broader range of frequencies, but as we broaden the usable spectrum over which it will work, we will see less gain on the "center" frequency. If you're getting the idea that tuning an antenna involves trade-offs, you're getting the right picture. No improvements are possible without "cost" in another part of the operating spectrum. If we move to a directional TV antenna like, say, one of those antennas (not the dish) that still can be seen on some rooftops, we see what is basically a modified log periodic antenna. This antenna will generally be "pointed" or "aimed" in the general direction of the transmission antenna of the station(s) for which reception is desired. Stations with broadcast antennas to the side or the rear of this antenna won't be "seen" as the antenna is highly directional. Having said all that to get you up to speed on some fundamental concepts of the antenna, as we move up the frequency spectrum (starting "low"), the gain of the antenna will increase until we reach the "center" or the "tuned" frequency for that antenna. After that, increasing the frequency will result in signals with increasingly lower gain.


How do I tune my rabbit antenna?

Get the signal meter on screen then rotate the antenna to the spot the meter reads the highest, this is the point of most signal. Leave the antenna in that position. spreading the rods apart results in more gain.


Range on 36 cb antenna?

That solely depends on the strength of the output signal, and many other factors like environment, frequency, etc. as a typical rule of thumb, range doubles for every 6-7 db gain, so a 12 db antenna will have double the range of a 6 db, but again, its a factor of the strength of the output


What is relation between antenna gain and beamwidth?

bandwidth refers to the amount of the frequency spectrum that a signal resides in.example, the spacing between channels on radio are determined by their bandwidth. beamwidth is a physical characteristic of an antenna. they generally mark the point bore sight of a directional antenna that are at -3dB or half power


What is a list of the parameters that control the design of earth station?

The earth station depends on the following parameters• Transmitter power• Choice of frequency• Gain of antenna• Antenna efficiency• Antenna pointing accuracy• Noise temperature• Local conditions such as wind, weather etc,• Polarization• Propagation losses


What is the function of the RF amplifier?

rf is a single tuned amplifier . Its functions are :- 1.improves selectivity ( i.e rejection of unwanted signal) , so that it prevents heterodyning which results in interference frequency. 2. improves image frequency rejection 3. improves sensitivity ( gain of amplifier ) 4.improves coupling of receiver with antenna . 5. improves signal to noise ratio. 6. reradiation of local oscillator through receiver antenna is prevented


What is the effect on analog signal by increasing its gain?

There is no effect on frequency but the amplitude is increased


What is antenna tilt?

Antenna gain of base station for a specific user depends on antenna pattern, antenna orientation (azimuth and tilt) and user's coordinates with respect to base station.


Do you need a special aerial to receive high definition television on a freeview box?

Antennas are designed to work in certain frequency bands. They are essentially "tuned" to one or more bands (Depending on elements used) to increase the gain in those bands. Now if the signal is strong enough from all channels you can get by with just connecting a wire to the antenna input. The length of the wire in terms of the wavelengths of the signals being received determines how well the antenna matches to the incoming signal. So the answer is try using your old antenna and if you have signal strength problems you can rotate the antenna or get one specifically designed for your HD channels. Another option is to use an amplifier at the antenna to boost signal going to the TV. If you are close enough to the broadcasting station, you can use a coat-hanger, so NO it doesn't require a special antenna to receive the digital high definition signal locally.


What is the formula to calculate EIRP?

EIRP= Power of transmitter(dbw) + Antenna Gain (dBi) - (Feeder Loss + Combiner Loss) Feeder Loss depends on operating frequency, type of feeder (coax, waveguide, ladder-line, etc.), and nominal frequency for which the feeder is designed.


I just bought a TV and I've got an antenna already but the signal is not good. Do I have to buy a set-top box?

to improve the signal and gain extra channels, certainly


What is the equation linking power of a radio telescope and the diameter of its dish?

For any parabolic antenna used to focus radio waves, the following formula is pretty good. GdB = 20 log( F D ) + 7.5 G = the gain of the antenna in dB, compared to an isotropic antenna F = the frequency, in GHz, at which the gain is 'G' D = the diameter of the parabola, in feet The formula assumes that the antenna's efficiency is 50% . If this bothers you and you want to assume 100% efficiency, simply change the ' 7.5 ' to ' 10.5 '. The formula shows that if the diameter of the antenna is doubled, or if the frequency of interest is doubled, then the antenna has four times as much gain ( + 6 dB ).