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Class Information
Number: 342/199
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > With particular circuit > Automatic frequency control (afc)
Description: Subject matter wherein the circuitry is provided to maintain the frequency of the radar at a constant value or in a fixed relation with respect to some other section of the radar.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8712360 System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS Apr. 29, 2014
8532600 System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS Sep. 10, 2013
8385482 Start-up automatic frequency control (AFC) method and apparatus Feb. 26, 2013
8325085 Weather radar signal processing Dec. 4, 2012
8301098 System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS Oct. 30, 2012
8149963 Start-up automatic frequency control (AFC) method and apparatus Apr. 3, 2012
7583224 Radar apparatus with automatic local oscillator tuning function Sep. 1, 2009
7551988 Method of software defined radio (SDR) waveform/function management Jun. 23, 2009
7446699 Error corrector for radar timing systems Nov. 4, 2008
7412013 Start-up automatic frequency control (AFC) method and apparatus Aug. 12, 2008
7355484 Oscillator and radar apparatus using the same Apr. 8, 2008
7340280 Method of configuring base station, and base station Mar. 4, 2008
7236547 Start-up automatic frequency control (AFC) method and apparatus Jun. 26, 2007
7187732 Start-up automatic frequency control (AFC) method and apparatus Mar. 6, 2007
7019684 Phase lock loop circuitry Mar. 28, 2006
6630903 Programmable power regulator for medium to high power RF amplifiers with variable frequency applications Oct. 7, 2003
6597308 Radar apparatus Jul. 22, 2003
6577270 Radar transceiver Jun. 10, 2003
6532271 Carrier recovery and doppler frequency estimation Mar. 11, 2003
6147560 Method and device relating to supervision and control of an oscillator signal Nov. 14, 2000
6072427 Precision radar timebase using harmonically related offset oscillators Jun. 6, 2000
6057798 Apparatus and method for frequency modulation May. 2, 2000
5790068 AFC control switching circuit Aug. 4, 1998
5751195 Circuit to indicate phase lock in a multimode phase lock loop with anti-jamming security May. 12, 1998
5694132 Voltage feedback linearizer Dec. 2, 1997
5654716 Circuit for short duration multiple look pulse based frequency measurement Aug. 5, 1997
5497402 Automatic frequency control device for satellite communications ground system Mar. 5, 1996
5408239 Method for setting search band widths of a GPS receiver Apr. 18, 1995
5151703 Method and apparatus for improved automatic fequency control Sep. 29, 1992
5107272 Radar system employing injection locked transmitter stage Apr. 21, 1992
4983978 Multi-frequency comb generator for radar and the like Jan. 8, 1991
4982195 Servo control with self calibrating preset Jan. 1, 1991
4823133 Radar system Apr. 18, 1989
4809004 Crystal controlled magnetron Feb. 28, 1989
4626856 Radar signal correction system Dec. 2, 1986
4600889 Coherent oscillator Jul. 15, 1986
4600924 Automatic frequency control for radar receiver Jul. 15, 1986
4591859 Radar transmitter May. 27, 1986
4510622 High sensitivity millimeter-wave measurement apparatus Apr. 9, 1985
4330760 System for correlating the operating frequencies of two variable-frequency microwave generators May. 18, 1982
4241345 Pulse radar transmitting oscillator Dec. 23, 1980
4238796 Radio frequency pulse generator Dec. 9, 1980
4228434 Radar receiver local oscillator control circuit Oct. 14, 1980
4179694 Frequency control systems Dec. 18, 1979
4159475 VCO-Controlled phase lock system Jun. 26, 1979
4071844 Frequency control for frequency agile pulse radar Jan. 31, 1978
4052722 Traffic radar and apparatus therefor Oct. 4, 1977
4042922 Multi-mode radar system Aug. 16, 1977
4023171 Microwave velocity sensor using altimeter echo May. 10, 1977
4023169 Automatic frequency control circuit for frequency agile radar May. 10, 1977

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