How do I make radar?

Answer 1

Tie tinfoil onto your head, and place a spoon between your teeth.

Then go outside (not indoors because the house will block the signal).

Jump up and down and clap your hands shouting "Give me it! Give me connection! Wobba wooba woo."

Then look around and you should be able to see everyone looking at you.

Bingo! You know where everyone is.

Answer 2

RADAR stands for RAdio Detecting And Ranging. It works on the principle that if we know the time that it takes for an elctromagmetic wave to be sent out and return then we will know the distance to the object. If that object is moving we can look at the differnece in return time over a period of time and tell its speed that way.

If we measure the frequency difference between the signal that we transmit from the radar set and the signal that returns we can caluculate the speed or relative velocity of the object that way as well. This works because of the doppler effect and it is the principle behind police radar as well as weather radar that gives velocity information and hence is the basis of how tornado warnings (wind sheer) are issued.

If we look at the intensity of the signals return relative to the one that was transmitted then we can get the relative intensity of something such as a thunderstorm.

It takes approximatley 12.35 microseconds for a radar signal to traverse 1 "radar mile" as it is often called. This is over 6,080 feet = 1 nautical mile.

Large radars use something called a magnetron to produce enough EM energy to send out a very powerful signal sometimes 1 million watts or more. This is all actuatted by a device called a klystron which is a resonate cavity where the EM waves are generated at low power. klystrons are used in low power radars as stand alone signal generators for the set.

There of course must be a switch from transmitt to receive and as you can imagine it works extremely fast since we are working with EM waves traveling at the speed of light.

Not the kind of parts that you get at a local radio shack.

High frequencies usually require the use of what are called wave guides instead of coaxial cables. They basically look like small pipes and are often rectangular in shape.

Radar antennas can be very small from the antennas on board a small boat to a very large parabolic dish used for weather radar.

Some of the antennas rotate while others use a series of diodes switched on and off in a rotating pattern to give the effect of antenna rotation.

Be careful UHF frequencies and beyond can be dangerous since we are working with the same frequencies that cook hotdogs in the microwave.

Answer 3

to make a radar you need to be able to transmit an electromagnetic wave and have the equipment to mesure the phase difference from the echo you get back from the object that will be reflecting your wave.

what do you mean by Radar, do you mean speed camera ? or just an equipment to detect objects ?

Answer 4

Exceed speed limit where posted and a proof is the citation.

Answer 5

You don't.
It exists already.