how does a telegraph operate?
92951
the ground is being use as one line and a wire hangs on air to the other with batteries connected to the circuit. either end has switching device (key) and magnetic sounder. when an operator press the key (short and long) several times with different pressing lenght, this represent letters and the other end operator hears the long and short combination. he know about the code (Moorse Code) so he can spell the message
1175882
the information is quantized, that is, it is assigned some voltage values and then it is modulated, for that modulation there are several techniques with different frequencies intervales. in the case of cable, the channel that is used to send the information is the optical fiber, so u use a transductor from voltage to light and then at the receiver u have a transducter that does the opposite. the receiver is usually the nearest cable station to ur house, so, actually the optical fiber doesn't go to your house, i'll bet u have a coaxial cable that goes up to the decoder. if u don't have a decoder (actually i'm not from the U.S. so i don't  really know if the system is the same, but it must be a lot alike) the cable goes directly to your tv, it means it wasn't codified and it is easier for your neighbors to steal your cable system. and then your tv has a system to convert this voltage signal to the images u see, and that's about it!
534759
Satellites. For cell phones, a radio signal is sent to a tower and then to a satellite and back down and to the other phone. For GPS, a signal is sent directly and so the user's location is more exact. For remote controls, the remote sends a signal to the object through the thing on the top and that is received by the sensor on the object.
1047572
Could you please elaborate more? are you asking about how the GSM network operates? or are you asking about their IT infrastructure?
1035222
A tap delay line is simply a bunch of memory storage devices that will delay the data (or signal). \n\np successive convolutions of g(n) is the same as the Fourier transform of g(n) to the p-th power.  I don't recall but it seems like that might be a propertry of convolution/Fourier transform.
1125728
Field Radio Operator.
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Remote control cars have circuits inside which respond to the radio frequency signal sent out by the controller. It will control the motor speed and direction, and control the steering motor.  Batteries provide power for the control circuitry which delivers it to the motors in the car.\n\nThe controller is a radio frequency transmitter which sends varying signals to the car.  The signals depend on the position of the control sticks on the controller.
904565
I imagine that what is being referred to here is the wiring throughout a home. Basically it takes the mains electricity from the street, runs it through a meter box and some fuses or circuit breakers to prevent fires and electrocution, and then it runs to the lights on one circuit and the power outlets on another circuit.\n\nHope this is what you mean?
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Basically they are energy waves that can travel through objects. They spread in the same manner as water waves but at a speed of 300,000 km/sec. They are used to communicate (voice, data, video) by making variations in the width and height of the waves. The receiver can interpret the variations and extract the information (audio, video, data).
460378
The basic theory is that if you pump steam into a place where there is a piston, the piston will move up.  Then you release the steam and the piston will go down.  You connect the piston to something to get movement, such as some gears that turn the propellers or connect them to the wheels.  It's a bit more complicated than that, but that's basically how it's done.
825835
I'm not sure the topic or your newspaper article...but here are a couple of general suggestions:\n\nTerm Telegraph\nCopious Communication - Copious means lots of something
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The voice / music is modulated (FM: Frequency or AM: Amplitude), once the signal is modulated it is amplified and trasmitted to an Antenna that amplifies the signal again in order to reach your radio device.\nYour radio take that signal from the air (it has been atenuated while travling in the air), de-modulate the signal and extract the voice/music to be amplified so you can listen what is being played at radio station...\nThis is the basics, but there are many things involved in a broadcast process...
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Electromagnetic waves??? thats something ive never heard of before. how about posting the article or the website online? \n\ni do know that electricity can be "transmitted" by magnetism, via electromagnetic induction. according to faraday's law, a changing rate of magnetic flux linkage induces an electromotive force, and thus induces current on a conductor. check out faraday's law at wikipedia for more info dude...
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International Telephone and Telegraph
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The radio uses a transducer called an aerial to convert the radiowaves to current in a conductor, after low noise amplification and filtering to reject most of the other radiowaves that the transducer has converted, the short-term changes in the current are interpreted as a wanted modulation of the radiowave.
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should be able send signals with minimum (atenuations)loss of signals;\nshould have a high transmission speed-Bandwith;\nAccessibility and reparable;\nproduces what enters from the begining at the end;
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the mechanic is Doppler effect.\n\nthey send microwaves or some sort of electromagnetic waves and then they measure the frequency of the reflected wave and then they can determine the speed of a vehicle