Patent ID: 6157810
Filing Date: 2000-12-05
Classification: H03D,H03L,H04B,H04W

Abstract:
A system for receiving a first RF signal contained in a first RF bandwidth, transmitting said first RF signal over a low bandwidth medium having a transmission bandwidth below said RF bandwidth, and generating a modified RF signal contained in a second RF bandwidth, said system comprising:a) a receiving means for intercepting said first RF signal;b) a global reference oscillator for providing said system with a global reference tone of high stability at a frequency within said transmission bandwidth of said low bandwidth medium;c) a first local oscillator controlled by a first adjustment signal derived from said global reference tone, such that said first local oscillator generates a first RF reference tone of high stability;d) a first mixing means connected to said receiving means and to said first local oscillator for mixing said first RF reference tone with said RF signal to produce an IF signal within said transmission bandwidth, said first mixing means being further connected to said low bandwidth medium for feeding said IF signal through said low bandwidth medium;e) a second local oscillator at a remote location from said first local oscillator, said second local oscillator being controlled by a second adjustment signal derived from said global reference tone, such that said second local oscillator generates a second RF reference tone of high stability at a frequency different from said first RF reference tone; andf) a second mixing means connected to said second local oscillator and to said low bandwidth medium for receiving and mixing said IF signal with said second RF reference tone to generate said modified RF signal contained in said second RF bandwidth.