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I'm not an electronic whiz by ANY means, but if I'm correct...Transmitters do the sending and antennas do the receiving.
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∙ 15y ago
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If a binary signal is sent over a 3-kHz channel whose signal-to-niose ration is 20dB what is the maximum achievable data rate?
The Nyquist Limit can be disregarded as this is not a noiseless channel (faster signal = more noise, this channel's s/n ratio is provided as 20dB)thus we use Shannon's result which says the maximum data rate of a noisy channel is X = H Log2 (1 + S/N) bps using 10Log10 S/N as our standard quality2 = Log10 S/N --> S/N = 102 --> S/N = 100X = 3000 Log2 (1 + 100) bps which gives you x = 19,974.63bps as your final answer.~ Mike------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ALTERNATIVE APPROACHThe formula -Shannon Capacity = Bandwidth * log2 ( 1 + Signal Power / Noise Power )gets approximated to -Shannon Capacity = Bandwidth * ( Signal to Noise ratio in dB ) / 3assuming the fact that ....Signal to Noise ratio in dB = 10 log10 ( Signal Power /Noise Power )and also assuming1 is much much less than Signal Power/Noise PowerSo in the present case the approximate answer works out toShannon Capacity = Bandwidth * ( Signal to Noise ratio in dB ) / 3 ...= 3KHz * 20 dB / 3= 3 * 103 * 20 / 3 bits per second= 20000 bits per second~ANIRUDDHA GHOSHJADAVPUR UNIVERSITYBSc Mathematics - 2004 - 2010MCA - 2007 - 2010~
What are three imporatant characteristics of a periodic signal?
same signal pattern over time, how much time does it take to transmit a cycle
What is the principal cause of data rate limitation on wire pair?
The usual twisted copper pair of wires has limited bandwidth because the signal frequencies attenuate the longer the wire is due to electromagnetic radiation and due to conversion of signal energy to heat. Coaxial cable is much better on these two factors as well as shielding the signal from external noise
Where is the energy input to produce light in your home?
Assuming you mean electric lights, then eventually the power company. The power company generates power, and sends it over power lines to your home. These are the same power lines that you might see crossing the interstate, or traveling parallel to the city streets. If no power line visibly connects to your home, you might have an underground power line. They're generally much more expensive, but less susceptible to the weather, and much more sightly.
Peak power 400 watts how much is continuous power?
Around 150Watts. continuous/nominal power is found by multiplying the peak power by the square root of two (0.707). in this case peak power = 400, therefore 400 * 0.707 ≈ 280 watts
What is the working principle of wireless power transmission?
The working principle behind wireless power transmission is electromagnetic induction. Let's look at it. We need a power source and a transmitting antenna, and also a receiving antenna to which we can connect the thing to be powered (the electrical load, or just the load). The power source will deliver a high power signal to the antenna. This will create an electrostatic field around the antenna that changes as the signal to it changes. This will create electromagnetic waves that will travel out from the antenna and through the air. The receiving antenna will be in the path of these waves, and the waves will pass by it and "sweep" it with their moving electromagnetic fields. This will induce a signal in the receiving antenna proportional to the energy that the antenna captures. This signal will cause current flow that will power the load. The problem with this system is that it is challenging to "direct" and "confine" the transmitted signal to optimize how much of it gets to the receiving antenna. Additionally, distance causes loss, and there will be a lot of loss over longer distances. The more the distance the signal travels, the much more the loss. But the system works to a limited degree. Links can be found below.
How much will a USB WiFi antenna boost a WiFi signal?
Depending on the make and model of the USB WiFi antenna, it can boost a WiFi signal range up to 1000 feet and some claim to boost the signal by four times whatever the current output is.
What is Wireless transmission system?
A wireless transmission consists of at a minimum: input signal (the data or analog signal you wish to transmit), transmitter, 2 antennas, space (the final frontier) and a receiver/reproducer. This only makes one way transmission possible. You would need an additional: transmitter, receiver/reproducer and 2 antenna couplers (allows both a transmitter and receiver to use the same antenna) to have 2 way communication. A basic transmitter consists of a power source, a signal generator (oscillator), signal converter/amplifier, mixer (mixes the oscillator and amp signals to create the transmitted signal), output amplifier. a receiver is similar to a transmitter except instead of mixing the signal with the oscillator signal it removes the oscillator signal. Systems can be much more complicated depending on power needs (distance between antennas, frequency interference...) and application (encoder/decoder, security or digital conversion).
What is the use of parabolic antenna probes or perforator?
When used for transmitting, it concentrates the signal into a narrow beam much like a flashlight beam. For receiving, it concentrates the signal onto a point in front of the dish where it is strongest and can be picked up by the receiver.
How much harm can a GPS signal cause?
None. The power level is just too low.
How much power is needed to lift a 2000N object in 4.0s?
500N
What is difference between resonant and non-resonant antenna?
Every antenna is at resonance according to length to which it is cut ! They are usually cut to resonate at a particular band of frequencies, ie, Vhf Television band etc.If no resonance then no signal is present and in such a case antenna is merely a random chunk of metal.The magnetic field that an antenna puts out will produce an electric current on any conducting surface that it strikes, however if that surface has a characteristic length the induced current will be much stronger on the object. For example, when a Citizens Band signal travels through the air, it completes a cycle in approximately 36 feet. If the object that the magnetic wave strikes is 18 feet long (1/2 wave length), 9 feet long (1/4 wavelength) or 36 feet long (1 full wavelength), then the induced current will be much higher than if the signal struck a metal object that was not some appreciable fraction of the wavelength of the signal.A resonant antenna is so much more efficient at converting (receiving or transmitting) current between the field and the antenna's feed-point than a non-resonant antenna that much effort is put into configuring resonance. A non-resonant antenna still works as an antenna but simply requires a more sensitive receiver or more powerful transmitter.If you have ever heard people say they want to "tune" their antenna, they usually mean they mechanically change lengths in relation to the frequency / wavelength they are trying to match. It is also possible to change electrical properties to match frequency, which is more handy for matching multiple frequencies with a single antenna.
Why collision detection is not possible in wireless network?
two reasons 1. In wireless each station has one antenna for both sending and receiving. hence we cant use the same antenna for both transmitting and at the same time detecting collisions. Further even if we have two antennas, it will be difficult to detect collision. because the transmitting signal power will be much higher than the incoming signal. hence if the sender senses signals it will fairly get a net result (an addition) of its transmitted signal and any other signal transmitted by others. it may be that its own signal is so much powerful than others that it will not recognize any collision. 2. In wireless, only the receiver is in problem. not the transmitter. so detecting for collisions at the senders end does not really make sense. we need to detect collision at the receivers end. the sender is not able to tell it whether there is a collision in receivers end. sukarna_barua@yahoo.com
Difference between gsm antenna and microwave antenna?
In GSM mainly using Panel type antennas but in the case of Microwave Antenna using Horn antennas. Microwave anteenas propogate signal straghtly. So line of sight (LOS) is main issue in the case of Microwave antenna, it means that both antennas must be allign in face to face. Microwave antennas are using for link between BTS but GSM antennas are directly link with customers. Antenna Gain also very much difference both cases. JPS o,[.[;.;[.]/]/ pppppppppppppppp
How much electric is needed to power a house?
5 units in per day
How much horse power boat needed to water ski?
50 hp
When is an antenna a communications tower?
a communications tower has multiple antenna's (usually for multiple communications systems and net works) and is much higher than just a single antenna
