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Class Information
Number: 455/340
Name: Telecommunications > Receiver or analog modulated signal frequency converter > With particular receiver circuit > Coupling or decoupling between stages > Variably tunable or adjustable
Description: Systems wherein the coupling or decoupling means is recited as variably tunable or adjustable whereby the extent of the effective coupling or the width of the band passed by the network may be varied.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5020092 |
Dual-bandwidth cellular telephone |
May. 28, 1991 |
| 5012490 |
Varying bandwidth digital signal detector |
Apr. 30, 1991 |
| 5008925 |
Cellular telephone responsive to service availability for operating on different cellular telephone systems |
Apr. 16, 1991 |
| 4989264 |
Bandwidth limiting circuit with variable bandwidth |
Jan. 29, 1991 |
| 4972509 |
Band switching circuit of a tuner |
Nov. 20, 1990 |
| 4965853 |
Radio receiver circuit with tuning feedback control for a tunable bandpass filter |
Oct. 23, 1990 |
| 4910796 |
Automobile antenna |
Mar. 20, 1990 |
| 4905306 |
Filter switching arrangement for a tuner |
Feb. 27, 1990 |
| 4903332 |
Filter and demodulation circuit for filtering an intermediate frequency modulated signal carrying a modulation signal |
Feb. 20, 1990 |
| 4876739 |
TVRO receiver system with low-cost video-noise reduction filter |
Oct. 24, 1989 |
| 4866779 |
Adaptive AM audio processor |
Sep. 12, 1989 |
| 4835608 |
Image trap filter circuit |
May. 30, 1989 |
| 4833419 |
Non-inductive radio apparatus |
May. 23, 1989 |
| 4792993 |
TVRD receiver system with automatic bandwidth adjustment |
Dec. 20, 1988 |
| 4780909 |
Signal receiver having automatic frequency characteristic adjusting capability |
Oct. 25, 1988 |
| 4739517 |
Autodyne receiver |
Apr. 19, 1988 |
| 4736457 |
Circuit arrangement for a tuner for changing over two frequency bands |
Apr. 5, 1988 |
| 4731877 |
Tunable lowpass-highpass switching filter |
Mar. 15, 1988 |
| 4726072 |
Double converter tuner |
Feb. 16, 1988 |
| 4718117 |
TVRO receiver system with low-cost video-noise reduction filter |
Jan. 5, 1988 |
| 4713689 |
Frequency demodulator for television receiver with time multiplexing |
Dec. 15, 1987 |
| 4695792 |
Method and system for measuring the amplitude and phase angle of harmonics in a periodic signal |
Sep. 22, 1987 |
| 4686706 |
Digital signal receiver |
Aug. 11, 1987 |
| 4685150 |
Tuning of a resonant circuit in a communications receiver |
Aug. 4, 1987 |
| 4662001 |
Tunable notch filter for image frequency and conducted local oscillator leakage rejection |
Apr. 28, 1987 |
| 4646360 |
Constant bandwidth RF filter with improved low frequency attenuation |
Feb. 24, 1987 |
| 4619000 |
CATV converter having improved tuning circuits |
Oct. 21, 1986 |
| 4601062 |
Tracking image frequency trap |
Jul. 15, 1986 |
| 4598426 |
Variable intermediate bandwidth AM receiver |
Jul. 1, 1986 |
| 4580289 |
Fully integratable superheterodyne radio receiver utilizing tunable filters |
Apr. 1, 1986 |
| 4554678 |
Wireless receiver having crystal filter at outputs of preamplifier |
Nov. 19, 1985 |
| 4531148 |
High sensitivity FM signal demodulation system |
Jul. 23, 1985 |
| 4528698 |
Tuning system for RF receiver |
Jul. 9, 1985 |
| 4481673 |
RF Prom tracking for tuners |
Nov. 6, 1984 |
| 4480338 |
Lowpass-highpass electronic switch |
Oct. 30, 1984 |
| 4476583 |
Electronic tracking for tuners |
Oct. 9, 1984 |
| 4472685 |
Phase-locked loop frequency demodulator and frequency synthesizer |
Sep. 18, 1984 |
| 4468644 |
Tunable reject filter for radar warning receiver |
Aug. 28, 1984 |
| 4466133 |
Radio receiver apparatus including multipath fade compensating arrangement |
Aug. 14, 1984 |
| 4466128 |
Automatically centered pulsed FM receiver |
Aug. 14, 1984 |
| 4464636 |
Wideband IF amplifier with complementary GaAs FET-bipolar transistor combination |
Aug. 7, 1984 |
| 4462009 |
Broadband filter and tuning system |
Jul. 24, 1984 |
| 4435841 |
Communications receiver having a switchable filter input stage |
Mar. 6, 1984 |
| 4429279 |
Variable bandwidth filter |
Jan. 31, 1984 |
| 4418428 |
Tuning system for a multi-band television receiver |
Nov. 29, 1983 |
| 4418427 |
Tuning system for a multi-band television receiver |
Nov. 29, 1983 |
| 4402089 |
Television tuning system with electronic frequency adjustment apparatus |
Aug. 30, 1983 |
| 4399559 |
Voltage controlled tuner with voltage variable frequency selective arrangements controlled in response to a control voltage generated independently of the tuning voltage |
Aug. 16, 1983 |
| 4339829 |
Automatic tuning system for a narrow bandwidth communication |
Jul. 13, 1982 |
| 4334323 |
Self tracking tuner |
Jun. 8, 1982 |
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