Telecommunications – Carrier wave repeater or relay system – With frequency conversion
Patent
1996-01-17
1998-09-01
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
With frequency conversion
455 10, 455 17, 370315, H04B 714
Patent
active
058024522
ABSTRACT:
A multiple channel radio frequency repeater has a receive port for receiving an input signal from a first antenna and a transmit port for transmitting a frequency shifted output signal to a second antenna. An input bandpass filter is located at the input port. A low noise amplifier follows the input bandpass filter for amplifying all signals within the input bandwidth. A plurality of channel filters divide the input signal into a plurality of channel signals. A local oscillator generates a local oscillator (LO) signal. There is a mixer corresponding to each channel, each mixer has an input port, an output put port and an LO port. The LO port is coupled to the local oscillator. An Automatic Gain Control (AGC) amplifier is between each channel filter and each mixer for adjusting the channel signal level to the mixer input port to assure that each mixer has the same level amplified channel signal. The LO signal is mixed with the amplified channel signal at the mixer input port to shift the frequency of the amplified channel signal at the mixer input port to an output frequency at the mixer output port. An output bandpass filter between the output ports of the mixers and the repeater output port for combines and couples the plurality of frequency shifted channel signals to the repeater output port.
REFERENCES:
patent: 3886452 (1975-05-01), Seidel
patent: 4002980 (1977-01-01), Herz
patent: 4764979 (1988-08-01), Noguchi et al.
patent: 5023930 (1991-06-01), Leslie
patent: 5230098 (1993-07-01), Seki
patent: 5287543 (1994-02-01), Wolkstein
Collins John M.
Grandfield John E.
Hewett William H.
Anderson Floyd E.
Eisenzopf Reinhard J.
GTE Government Systems Corporation
Nguyen Lee
Suchyta Leonard C.
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