Electronics Engineering

Frequency modulated continuous-wave (FM-CW) radar is usually used with a couple of different antennas. One is for the transmitted signal, and another one (or more) is (are) used for the reception of any returns. We usually think of radar as a pulse of electromagnetic energy that is transmitted out, and then a receiver looks for any returning (reflected) signal. In FM-CW radar, the transmitter is "always on" and a continuous signal is being sent. Additionally, the frequency of the transmitted signal is varied (or "swept") above and below a center frequency which the local oscillator runs on and maintains. The new units are largely microprocessor controlled pieces of equipment. They take the now-FM-modulated signal and broadcast it continuously (per the name - CW, which is continuous wave), and the returns are picked up by a receiver. The frequency of the return signal is compared to the instantaneous frequency of the transmitter, and the frequency difference can be looked at by a processor which can derive a time difference between the two signals (based on the differential frequency). This derived time difference will be proportional to the distance to the target that returned the signal. Another bit of processing on the signal returned from that target will produce a rate of change of distance, which can be converted to speed. As the power of the processors that we task with these objectives in mind has increased so dramatically, the processor can plot a course and speed with all appropriate vectors we wish to visualize when it puts up its findings on some kind of display - and in color! Particulars become technical very quickly, but the overview is accurate. A link to the Wikipedia article on FMCW is supplied, but at this writing, the article is still a stub that will supply little more than is here already.

hamming code between 1000110 and 1110100 can be calculated by just exoring both codes with each other as follow: 1000110 1110100 ------------ 0110010 now by counting the ones in the result that gives 3 then hamming dictance = 3

This product is designed to automatic control of motor, which ensures constant reserve of water in storage tanks.

Automatic water level controller is used to automatically fill the over head tank as and when it gets empty and monitor the water level in it.

Automatic water level controller switches ON the motor when the water level in the overhead tank drops below pre fixed low level(on point) and puts off the motor when water level rises up to pre fixed high level (off point) motor also switches off when the sump water is exhausted before filling overhead tank, pump running dry, Mains voltage fluctuations.

Electrical inductive motors, transformers and magnetic ballasts bring real power that are measured in kilowats and reactive power (measured in kilovolt-amperes reactive, kvar). Real power genrates "productive" work. Reactive power does the the magnetic field required for inductive devices to operate.

A wiper motor is a DC motor with two permanent magnets that serves as a field for the motor, arranged around the armature where the power is connected to the commentator of the armature with two brushes, the armature is a set of electro magnetic coils that is each connected to its own two segments in the commentator so that the power is connected to only one coil at a time to generate a magnetic field in the armature, this field will appose the field of the permanent magnet field, where the one field will push the other away and make the motor to turn.

AC do not really repels, only thing you have a better chance to get away, because with AC the power is going on and off 50 or 60 times per second where with DC, it is a continues current and if you touch it with the inside of your hand, the mussels in your fingers will close and your hand will grip the object and there is no escape, but if you touch it with the back of your hand and the voltage is not to high, there is a chance to get away. The safest is to stay clear from any DC voltage higher than 32 volt, it can be deadly.

The ability to conduct electricity is a property of a conductor.

There is no relation between the resistor's ohms value and its size. The power of the resistor can be seen by its size. If the power is too small, the resistor can be destroyed.

photodiodes are basically reverse biased diodes with optical windows that allow like to shine on the PN junction. Like any diode, the leakage current (otherwise known as a photodiodes 'dark' current) increases exponentually with temperature in accordance to William Shockley's idea diode eqation. The other effect in a photo diode is the probability of a photon of a certain energy allowing an electron to cross the PN junction. This is known as the quantum efficiency of the photodiode. Because increasing temperatures increase the vibration of the silicon atoms, making them easier to be knocked loose by a photon. Thus the quantum efficiency of a photodiode will increase with tempature, as well as the thermally induced noise. photodiodes are basically reverse biased diodes with optical windows that allow like to shine on the PN junction. Like any diode, the leakage current (otherwise known as a photodiodes 'dark' current) increases exponentually with temperature in accordance to William Shockley's idea diode eqation. The other effect in a photo diode is the probability of a photon of a certain energy allowing an electron to cross the PN junction. This is known as the quantum efficiency of the photodiode. Because increasing temperatures increase the vibration of the silicon atoms, making them easier to be knocked loose by a photon. Thus the quantum efficiency of a photodiode will increase with tempature, as well as the thermally induced noise. photodiodes are basically reverse biased diodes with optical windows that allow like to shine on the PN junction. Like any diode, the leakage current (otherwise known as a photodiodes 'dark' current) increases exponentually with temperature in accordance to William Shockley's idea diode eqation. The other effect in a photo diode is the probability of a photon of a certain energy allowing an electron to cross the PN junction. This is known as the quantum efficiency of the photodiode. Because increasing temperatures increase the vibration of the silicon atoms, making them easier to be knocked loose by a photon. Thus the quantum efficiency of a photodiode will increase with tempature, as well as the thermally induced noise.

I recently needed also to match IMEI with the vendor and device type. I found the following webpage where you can enter IMEI and get the device and vendor details at nobbi.com: http://www.nobbi.com/tacquery.php The only disadvantage is that if you need to match lets say more then 20 devices then you have to enter each one by one. Otherwise it is a great site. Good luck!

the laser was invented.....

For In Car / Kart Timing:

Located on the bottom of the car / Kart is a hall effect switch (similar to a reed switch but solid state, more sensitive and quicker to switch). This switch detects the magnetic strip which is fitted into the race track as the car / kart drives over it. This triggers the lap timer on the steering wheel and displays your lap time.

For Circuit Timing:

Each car / kart is fitted with an active RFID chip (transponder) which is constantly sending out its unique code over radio for a distance of about 1m. As the car / kart drives over the timing loop, the loop reads the unique code and tells the main timing system to trigger for that car / kart. In most profesional races the position of the transponder is regulated to ensure no advantage is gained by mounting it as far forward as possible. Some motorsports i.e. F1 demand more than 1 transponder in case of failure.

function of sl100

http://www.zy328.com/manager/upimg/2007927164937.pdf

A commutator is an electrical switch that periodically reverses the current direction in an electric motor or electrical generator. A commutator is a common feature of direct current rotating machines.

The actual computing is done on a Random Access Memory (RAM) chips under the control of a ROM (Read-only memory) chip. Collectively these are described as the Central Processing Unit (CPU)

Answer: If your receiver have three decoders build in you can set the code differently, if it only have one decoder you set the dip switches on the sensors the same as the receiver, but then the receiver won't be able to identify the sensors, it won't be able to tell what sensor send the signal. This problem can be solved by using a micro processor system like the Multi Zone from Micro Developments that can identify 65535 different sensors and there is no dip switches to set each sensors code and ID is pre programmed on the sensor

You can't use one resistor to bring a voltage down, you have to use two in series in a voltage divider configuration, that is two resistors of the same value in serie between positive and negative, then you will have 5V between negative and the point between the resistors, any value can be used depending on the current jou are going to draw, note: you can not use to small a value at least 1K or up, if the value is to small the resistor will get to hot and it can burn out or it can burn your power supply or you can simply use a 7805 voltage regulator chip, it is inexpensive and easy to use, it only have 3 pins 1 = input, 2=GND and 3 is your output, one can get it in many deferent voltages 7803,7805, 7808, 7812 etc. Note: you can even adjust the output voltage between 5V and the RMS value of your power supply, by connecting a pot between GND and the center pin of the regulator, a smoothing cap is needed between GND and the input and one between GND and the output 1 to 10 mf 16V

because your a frickin itiat

Neutral shift describes the phenomenon that happens when an AC motor drive shifts the neutral point of the motor. This is important because it can significantly interfere with the motor's ability to function if proper precautions aren't taken care of.

http://ftp.csci.csusb.edu/schubert/tutorials/csci310/f03/dw4bit.pdf

when it is "designed for safe and comfortable interaction between human beings and machines."

Ergonomic means just this:

VSAT is a layer 2 device.