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prateeksikka

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Posts posted by prateeksikka

  1. hi there!
    the method which i just told in my last post is popularly known as the method of balancing of EMFs.u can search on the net for the same....the standard EMF which u use must be grater than the EMF to be measured......
    We use the unknown EMF to balance the potential drop across a wire across which the main EMF is connected.
    good luck!

  2. hi Mwee

    i cant see the circuit u have posted properly here clearly.
    the image is blurred....
    yeah u can do with a smaller pot always but the only thing is the fear of getting damaged .because it will although divide the voltage but it wont offer much resistance between terminals 1 and 3.
    thats it otherwise u may use an auto transformer.
    good luck

  3. hi kevin!
    i agree with your point that we can measure voltage at a point with one probe only.but there is one condition ....
    to give us this right,we are forced to assume earth at zero potential wrt anything else on it.
    take for example a +5 V can be measured w.r.t 0V with 1 probe only.there would be no probe at all.But u need a second probe to see if the other lead is at -5V to see if the p.d is 10V and not 5V !!!!!
    i hope u are more clear....
    ;D

  4. GAIN IS SIMPLY ADDED IN TERMS OF decibels.

    10dB gain and a 3dB loss accounts for a net gain of 7dB for the receiver...
    Free space has a trasfer function of 1.so the power spectral density at the receiver  is the same as that at the transmitter.
    Assuming FSK transmission
    Probability of error=1/2*erfc(0.6*Es/No)
    if u are using ASK then 0.6 is replaced by 0.25
    it is 1 for PSK.
    For a giver BER i.e probability of error u can get signal energy....

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