Telecommunications – Carrier wave repeater or relay system – Two separate way transmission
Patent
1994-12-27
1996-07-16
Urban, Edward F.
Telecommunications
Carrier wave repeater or relay system
Two separate way transmission
455 761, 455 765, 455303, 330306, 330286, H04B 714
Patent
active
055376800
ABSTRACT:
A cellular receiver range extender has an input terminal connectable to an antenna and an output terminal to which may be connected a microwave radio receiver for cellular communication signals. The input terminal directs RF signals to a bandpass preselector covering a frequency spectrum of 825 MHz to 890 MHz leading to a low-noise preamplifier for amplifying the preselected RF signals. A divider coupled to the preamplifier feeds signals from the preamplifier at equal power levels into first and second RF paths. The first path includes a band pass filter covering the reverse cellular communication channel RF signal band from 825 MHz to 845 MHz, and the second path includes a band pass filter covering the forward cellular communication channel RF signal band from 870 MHz to 890 MHz. In the first path reverse channel signals are amplified by a low-noise amplifier while in the second path forward channel signals are attenuated. Thus, the power levels of reverse and forward channel signals are suitably substantially equalized by a power gain of at least about 10 times for reverse channel signals relative to forward channel signals. The first and second paths lead to a combiner which recombines the equalized reverse and forward channel signals. A low-noise output amplifier serves to amplify the recombined signals and directs them to the output terminal for use by a microwave radio receiver for cellular communications which may be connected to that output.
REFERENCES:
patent: 3737799 (1973-06-01), Stander
patent: 3911366 (1975-10-01), Baghdady
patent: 3988679 (1976-10-01), Clarke et al.
patent: 4668920 (1987-05-01), Jones
patent: 4679248 (1987-07-01), McKeown
patent: 4742561 (1988-05-01), Tipton
Insulated Wire Incorporated
Nguyen Lee
Parmelee G. Kendall
Urban Edward F.
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