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Unformatted text preview: kilometer. The bands are about 25,000-35,000 gigaherz
Signals can be sent thousands of kilometers with
negligible distortion. O ptical interfaces can be passive or active.
Passive: Active Passive Star broadcast: UNGUIDED MEDIA Free space propagation - Excluding losses, received
signal power falls inversely with square of distance.
Inverse square law does not correspond to dB per
kilometer - 6 dB per doubling of the distance.
Long distance radio transmission.
At low carrier frequencies, signals propagate around
earth’s curvature, increasing the range.
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This note was uploaded on 01/26/2014 for the course EE 362 taught by Professor Laporta during the Fall '08 term at Pennsylvania State University, University Park.
- Fall '08