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Computers and Electronics

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Submitted By falfuyero
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Rodriguez, Jean UNIT 1 HW

1. modulation is the process of putting information into a high frequency carrier for transmission.
2. a carrier frequency is the waveform that is modulated with an input signal for the purpose of conveying information
3. one reason modulation is used in communications is that more than one modulation signal can be sent on a carrier. Another reason is that we can modulate our voices or a message into a RF and transmit the message all over the world.
4. three parameters of a high frequency carrier that may be varied by a low frequency intelligence singal are Amplitude,frequency and phase.
5. MF frequency ranges goes from 300 - 3000 kHz, HF is 3 - 30 MHz, VHF is 30 - 300 MHz, UHF include 300 - 3000 MHz, and SHF rannge is 3 - 30 GHz.
7.xxxxxxxxxxxxxxxxxxxxxxxx a microwave transmitter typically
9. convert the following power to their dbm equivalents:
a) 1w= 30 dbm
b) 0.001w= 0 dbm
c) 0.0001w= -10 dbm
d) 25 uw= -16.02 dBm
15. electrical noise is any undesired voltage or current that appear in a circuit and it is a problem in communications because the information sometimes is obliterated.
16. external noise is a received radio signal that has been introduced by the transmitting medium. internal noise noise in a radio signal that has been intorduced by the receiver.
23. xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
38. hartley's law explains that the total amount of information that can be transmitted is proportional to frequency range transmitted and the time of the transmission.
40. the seventh harmonic of 360 = 2520 because 360 x 7 =2520.
49. resonance is defined as the sound or vibration produced in one object that is caused by the sound or vibration produced in another.
50. R=1200 F=100000000 Hz L=0.006 H w=2x3.14x100000000 = 628,000,000 Q=628,000,000 x 0.006/1200= 3,140 D=1/3,140= 0.000318
55. the quality of an lc bandpass filter provides a measure of how selective its passband is compared to its center frequency.

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