Remotely controllable variable intermediate frequency transceiver
AssigneeHarris Corporation
InventorPhilip Mambo
Life of this patent
Estimating the term…
Abstract
A transceiver and method of tuning a transceiver having a remote unit and a local unit. The remote unit includes a modulation section having a transmit frequency synthesizer and a receive frequency synthesizer and a frequency conversion section having a fixed frequency local oscillator, a transmit mixer and a receive mixer. The transceiver may be tuned by remotely controlling the synthesizers to select the frequency and/or data to be transmitted and the frequency and/or data to be received.
Claims15
A transceiver for transmitting a transmit signal and for receiving a receive signal, said transceiver comprising a remote unit and a local unit located away from said remote unit;
- said remote unit comprising:
- a frequency conversion section comprising a single, fixed-frequency local oscillator for up-converting an intermediate transmit signal to produce said transmit signal and for down-converting said receive signal to produce an intermediate receive signal;
- a modulation section for modulating an intermediate frequency (IF) transmit data signal to produce said intermediate transmit signal and for demodulating said intermediate receive signal to produce a receive data signal of IF receive data frequency;
- and, said local unit comprising remote control means for separately controlling variation of modulation of said intermediate transmit signal and variation of demodulation of said intermediate receive signal in said modulation section.
The transceiver of claim 4 wherein varying said modulation frequency changes data transmitted on said transmit signal and varying said demodulation frequency changes data received on said receive data signal.
A method of tuning a multi-stage transceiver at an intermediate frequency (IF) stage, said transceiver having a remote unit and a local unit, the method comprising the steps of:
- (a) providing an IF transmit data signal containing selected transmit data and a receive signal carrying receive data, said transmit data signal generated by said local unit;
- (b) modulating said transmit data signal with a modulation signal of controllable modulation frequency to thereby produce an intermediate transmit signal;
- (c) up-converting said intermediate transmit signal by mixing it with a carrier signal of fixed carrier frequency from a first oscillator to thereby produce a transmit signal carrying selected plural transmit data channels;
- (d) down-converting said receive signal by mixing it with the carrier signal of fixed carrier frequency from the first oscillator to thereby produce an intermediate receive signal;
- (e) demodulating said intermediate receive signal with a demodulation signal of controllable demodulation frequency to thereby produce a receive data signal carrying selected receive data;
- and
- (f) separately controlling said demodulation frequency and said modulation frequency from said local unit whereby varying said modulation frequency changes a selection of said selected transmit data carried on said transmit signal and varying said demodulation frequency changes a selection of said selected receive data carried on said receive data signal.
A transceiver for transmitting and receiving signals, and having a remote unit and a local unit located away from said remote unit, said remote unit comprising:
- means for receiving a receive signal having a carrier frequency;
- a receive mixer operatively connected to said receiving means for downconverting said receive signal to an intermediate receive signal having an intermediate receive frequency;
- a receive demodulator operatively connected to said receive mixer for demodulating said intermediate receive signal to a receive data signal having a intermediate frequency (IF) receive data frequency;
- a receive synthesizer operatively connected to said receive demodulator for providing thereto a receive modulation signal of controllable receive modulation frequency;
- a transmit modulator for modulating an IF transmit data signal to an intermediate transmit signal having an intermediate transmit frequency, and having means for receiving said transmit data frequency;
- a transmit synthesizer operatively connected to said transmit modulator for providing thereto a transmit modulation signal of controllable transmit modulation frequency;
- a transmit mixer for upconverting said intermediate transmit signal to a transmit signal to said carrier frequency;
- a single phase-locked oscillator operatively connected to said receive mixer and said transmit mixer for providing said carrier frequency thereto;
- and
- means for transmitting said transmit signal operatively connected to said transmit mixer;
- and
- said local unit comprising:
- a synthesizer controller operatively connected to said receive synthesizer and to said transmit synthesizer for selectively varying said demodulation frequency and for selectively varying said modulation frequency;
- means for receiving said IF receive data signal from said receive modulator;
- and
- means for providing said IF transmit data signal to said transmit modulator.
Dependencies are inferred from the claim text.