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Help me to answer some basic Electronics questions

Discussion in 'Electronic Basics' started by Diba, Nov 13, 2004.

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  1. Diba

    Diba Guest

    Hello, Plz help me by answering these questions-

    1) How does net browsing and searching a site takes place in internet ?
    2) Advantage of Transistor over FET ?
    3) Quantisation effect on BW of a signal ?
    4) Why we use laplace transform, F Transform and DFT ?
    5) Where each of these bands are used in Satellite comm.- uhf, C, X, Ku, ka
    6) Skin effect ?
    7) what is the loss range in Coaxial cables ?
    8) How to convert a transistor to diode ?
    9) How to run a PC with a DC source ?
    10) Physical realization of Phase modulation ?

  2. Active8

    Active8 Guest

    not an electronics related question. search on http, sql, cgi
    for what?
    Sometimes the BW is 2X the quantization freq plus the harmonics of
    the modulating signal - depends on modulation type - try the ARRL
    Handbook at da liberry.
    a) transforms a differential eq to an algebraic one.
    b) by transforming a complex periodic wave to Fourier series, we can
    then analyze the effect of a system on the individual sinusoidal
    components of said wave.
    c) DFT/FFT is how we convert a sampled signal in the time domain to
    the frequency domain.
    try google on ITU region II frequency allocation/spectrun -- or
    electronic databook, by TAB. Ku is roughly 10 GHz, C is 3.5 GHz (?),
    UHF is 300 - 3000 MHz
    google again - higher freq currents flow on the outside of a
    up to 9 dB per 100 ft or greater at 1000 GHz
    transisters can't be converted back to dudes. once you cut it off,
    that's it.

    connect the collector to the base. use the b-e junction of an npn,
    for example.
    Inverter. Try Walmart. Not all inverters are suitable for this.
    You get dizzy and fall down. No... you vary a reactance to vary the
    freq or phase. google varactor and IIRC saturable core reactor.
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