L15-x1rev

The noise power in a band of h herz is n0h s is the

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Unformatted text preview: e power in a band of H herz is N0H. S is the signal power. ATTENUATION is bad because: 1. Weakened signal reduces S/N, information capacity. 2. Attenuation is usually greater at the higher frequencies. In relaying a digital signal, it is better to regenerate it at each relay station than to just amplify it. GUIDED TRANSMISSION MEDIA Twisted pair, Coaxial cable, Optical fiber Guided media attenuation - measured in dB per kilometer V is voltage, P is power. Twisted Pair - a pair of wires twisted together to reduce electromagnetic coupling to and from the wires. Coaxial cable...
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