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| Number | Title | Issue Date |
| 4682131 | High-Q RF filter with printed circuit board mounting temperature compensated and impedance matched helical resonators A helical filter is disclosed which includes a ground plane having microstrip transmission line segments to which a respective helical resonator coil is connected at the high impedance end thereof. A discrete capacitor is connected in parallel with each t... | 07/21/1987 |
| 4679237 | Correction control circuit for AM stereophonic receivers A correction control circuit for use in compatible AM stereophonic receivers of the type utilizing a cosine correction signal to remove inherent distortion from the received and detected signals. During periods of weak or noisy signals or when co-channel ... | 07/07/1987 |
| 4658223 | High speed method of determining temperature compensation component values A method within adjusting values of a passive temperature compensation network for use in an oscillator includes the steps of determining the frequency variation of the oscillator from nominal over a specified temperature range, determining the maximum fr... | 04/14/1987 |
| 4646345 | Automatic unit ID for quasi-transmission trunked systems The system requires the use of the permanent ID of the requesting unit in every channel request made on a control channel before every transmission. The channel grant will include the ID along with the channel number and these may be recorded for possible... | 02/24/1987 |
| 4637022 | Internally register-modelled, serially-bussed radio system In accordance with the present invention, there is provided a register-modelled radio system comprising a plurality of register-modelled processors having addressable registers for modelling the virtual state of the processor; a serial bus, interconnectin... | 01/13/1987 |
| 4631745 | Analog divider with minimal phase distortion An analog divider circuit as for use in AM stereophonic receivers provides minimum phase variation with control voltage level change, by means of a feedback circuit. The division process is performed by subtracting logarithms of currents produced by the d... | 12/23/1986 |
| 4628269 | Pulse detector for missing or extra pulses A missing pulse detector is disclosed in which the absence of a pulse in a variable frequency periodic pulse train is detected and distinguished from a reduction in the pulse repetition rate. Between successive pulse train pulses a first counter counts cl... | 12/09/1986 |
| 4625331 | Automatic frequency control system or an SSB receiver A frequency control circuit for a single sideband receiver is disclosed wherein the local oscillator is swept at a first rate to enable the acquisition of a transmitted signal. When the signal is acquired, the local oscillator is swept at a second rate in... | 11/25/1986 |
| 4623833 | Alternator system multifunction fault detector Three possible types of "faults" may be detected in the ignition system of a vehicle, using simple combinational logic to provide an essentially error-free activation of an indicator when a true fault is present. "Fault" signals which mean non-rotation of... | 11/18/1986 |
| 4622695 | Channel scan allocation arrangement Evenly distributed channel use and prevention of interference are achieved in a two-way communications system by using an ID code transferred between a pair of associated units such as a base and a portable telephone. The number of the first channel to be... | 11/11/1986 |
| 4618981 | Tone detector with pseudo phase locked loop The tone detector provides accurate detection of a single predetermined tone frequency within a mixture of frequencies, utilizing a carrier signal source at a relatively high frequency. The high frequency signal is divided down to two frequencies, one jus... | 10/21/1986 |
| 4606075 | Automatic gain control responsive to coherent and incoherent signals Disclosed, herein, is an Automatic Gain Control (AGC) signal processor and a method for generating an AGC signal in a phase-locked receiver. An incoming signal, exhibiting both coherent and incoherent characteristics, is filtered to obtain the desired ban... | 08/12/1986 |
| 4602379 | Dual indicator circuit for tuning and stereo signals In a stereophonic broadcasting receiver, a single indicator with two levels of illumination serves to provide indication of both accurate tuning and the presence of stereophonic signals. One signal or a combination of signals related to the tuning circuit... | 07/22/1986 |
| 4602229 | Resonant bandpass T filter and power splitter In accordance with the present invention there is provided a bandpass T filter and power splitter for electromagnetic energy. It is composed of a plurality of resonant elements serially arranged to form a plurality of forward multi-pole bandpass filters. ... | 07/22/1986 |
| 4596043 | High efficiency radio frequency signal amplifier for amplifying modulated radio frequency signals in a manner generating minimal splatter A processing circuit for efficiently amplifying radio frequency signals while generating minimal splatter includes a first channel having an envelope detector for generating a rectified envelope signal from a modulated radio frequency input signal provide... | 06/17/1986 |
| 4595927 | Loran C cycle slip reduction technique In accordance with the present invention, there is provided a Loran C cycle slip reduction technique that consists of sensing the signal to noise ratio and narrowing the phase locked loop bandwidth when a predetermined signal-to-noise threshold is exceede... | 06/17/1986 |
| 4593460 | Method to achieve a desired bandwidth at a given frequency in a dielectric resonator filter There is provided a method and a corresponding apparatus for establishing the proper bandwidth at one frequency in a microwave, dielectric resonator waveguide filter. Bandwidth is determined by the product of the resonant center frequency and the interres... | 06/10/1986 |
| 4593402 | AM stereo transmitter An AM stereo transmitter with bandwidth limiting utilizes the detection of high frequency energy in the modulating signal to control the difference channel input to the stereo encoder.... | 06/03/1986 |
| 4584515 | Re-regulation circuit for automobile tachometer detection circuit A re-regulation circuit operates in the environment of a vehicle alternator/charging system and cooperates with the standard regulator to prevent momentary loss of load from reducing the field excitation to such an extent that the alternator AC output is ... | 04/22/1986 |
| 4583081 | Status indicator system for a radio-controlled door operator A door operator system includes up and down limit switches actuated to the closed position when the door reaches the up and down travel limits. A processor circuit within the operator is connected to the limit switches for ascertaining the position of the... | 04/15/1986 |
| 4580284 | Pilot tone cancelling circuit for AM stereo decoder In an AM stereo system wherein a low frequency pilot tone is added to the difference channel signal before modulation of the carrier, "image shifting" and audio distortion in a receiver, due to residual pilot tone signal, are removed by separating out a p... | 04/01/1986 |
| 4570265 | Random frequency offsetting apparatus for multi-transmitter simulcast radio communications systems Apparatus for randomly offsetting the frequencies of each transmitter in a simulcast radio communications system is described. The random frequency offsetting apparatus includes a random noise source for generating a noise signal which is amplified and lo... | 02/11/1986 |
| 4568894 | Dielectric resonator filter to achieve a desired bandwidth characteristic A method and corresponding apparatus for maintaining constant bandwidth over a frequency spectrum in a microwave, dielectric resonator waveguide filter. Bandwidth is determined by the product of the resonant center frequency and the interresonator couplin... | 02/04/1986 |
| 4559490 | Method for maintaining constant bandwidth over a frequency spectrum in a dielectric resonator filter A method and corresponding apparatus for maintaining constant bandwidth over a frequency spectrum in a microwave, dielectric resonator waveguide filter. Bandwidth is determined by the product of the resonant center frequency and the interresonator couplin... | 12/17/1985 |
| 4553262 | Communications system enabling radio link access for non-trunked radio units to a multifrequency trunked two-way communications systems An improved multifrequency trunked, two-way communications system is provided in which a plurality of conventional single channel radio units are provided access. The system includes a predetermined number of information channels that are shared by a plur... | 11/12/1985 |
| 4551696 | Narrow bandwidth microstrip filter An interdigital microstrip transmission line filter (100) includes three electrically conductive strips (104, 106 and 108) each coupled to grounded portions (110 and 120) on one end and coupled to respective capacitive loading pads (112, 116 and 114) on t... | 11/05/1985 |
| 4546329 | Frequency synthesizers adaptive loop filter with compensation for transients An improved adaptive loop filter for modulatable frequency synthesizers containing digital phase comparators is described. The unique adaptive loop filter provides a wide bandwidth during a signal acquisition mode and a narrow bandwidth during a signal tr... | 10/08/1985 |
| 4545072 | Method and apparatus for eliminating interference due to spurious signals generated in synthesized receivers A synthesizer radio frequency (RF) signal receiver (FIG. 1) for single sideband radios is described that can eliminate interference due to internally generated spurious signals, commonly referred to as "whistler spurs". The unique receiver includes first ... | 10/01/1985 |
| 4545071 | Portable radio for a zoned data communications system communicating message signals between portable radios and a host computer A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitte... | 10/01/1985 |
| 4539524 | Method and coherent demodulators for MSK signal Improved method and apparatus in the form of coherent demodulators for MSK signal or other angle-modulated carrier signals of substantially constant amplitude and continuous phase are provided. The coherent demodulators include a frequency doubler, a firs... | 09/03/1985 |
| 4534063 | Paging receiver and supporting receptacle therefor A paging device and supporting receptacle are provided for detachably securing the device to an article of clothing and providing for limited pivotal movement of the device to permit visual observation of a display portion of the device without completely... | 08/06/1985 |
| 4533188 | Header and housing assembly for electronic circuit modules An improved header and housing assembly for holding a miniaturized electronic circuit module having a plurality of leads includes a header member having a plurality of apertures arranged to accept the leads of the module. A jaw mechanism associated with e... | 08/06/1985 |
| 4531235 | Diversity signal strength indicator and site selection apparatus for using same A diversity signal strength indicator for transmission site selection in a cellular-like mobile radio system produces an output strength indication signal which is proportional to the logarithm of the average strength of two diversity input signals. The t... | 07/23/1985 |
| 4528698 | Tuning system for RF receiver A system is disclosed for tuning a heterodyne receiver. The system preferably includes a voltage tunable preselector filter whose output is applied to a mixer, a voltage tunable injection filter for filtering a local oscillator signal and for applying the... | 07/09/1985 |
| 4528686 | Fader circuit for vehicle sound system A two-channel audio amplifier for use in a vehicle sound system is provided. Each channel drives a pair of loudspeakers and includes a common amplifier connected to drive one terminal of each speaker. The remaining speaker terminals are connected to the o... | 07/09/1985 |
| 4527131 | Oscillating circuit exhibiting tolerance to crystal impedance variations An MOS crystal controlled oscillator circuit is provided which includes a pair of MOS transistors coupled together in complementary fashion to form a first non-inverting stage. The output of the first non-inverting stage is coupled to the input of a secon... | 07/02/1985 |
| 4525862 | Transform modulation system A single carrier is amplitude-modulated by a signal which is a transform (as the sine function) of the audio signal, and one set of sidebands is removed. In a receiver, the signal can be recovered by first deriving the Hilbert transform of the sine transf... | 06/25/1985 |
| 4525861 | Zoned data communications system for communicating message signals between portable radios and a host computer A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitte... | 06/25/1985 |
| 4525683 | Current mirror having base current error cancellation circuit A current mirror circuit comprising a first current mirror circuit with a first error correction transistor connected between the base and collector of the first transistor of the first current mirror; a second error correction transistor connected to the... | 06/25/1985 |
| 4525647 | Dual frequency, dual mode quartz resonator This invention is directed to an AT-cut quartz resonator having two different resonant modes simultaneously occurring in which a generally rectangular polyhedron has first and second electrodes disposed on opposing faces, and having the width to height se... | 06/25/1985 |
