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Randall Grunwell Phones & Addresses

  • 2492 Crofton Ct, Suwanee, GA 30024 (770) 962-5374
  • Sunrise, FL
  • Royal Palm Beach, FL
  • 2492 Crofton Ct, Suwanee, GA 30024 (770) 374-9433

Work

Position: Homemaker

Education

Degree: Associate degree or higher

Emails

g***l@charter.net

Industries

Telecommunications

Resumes

Resumes

Randall Grunwell Photo 1

Randall Grunwell

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Location:
Greater Atlanta Area
Industry:
Telecommunications

Publications

Us Patents

Spurious-Response Interference Tester

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US Patent:
6813477, Nov 2, 2004
Filed:
Feb 20, 2001
Appl. No.:
09/789779
Inventors:
Eldridge E. Harris - Stone Mountain GA
Pieter C. Seidel - Dacula GA
Randall L. Grunwell - Suwanee GA
Assignee:
Matsushita Mobile Communication Development Corporation - Suwanee GA
International Classification:
H04B 1700
US Classification:
455 6714, 455423, 455424, 455425, 4551152, 4552264
Abstract:
A system for testing protection against spurious response interference in a radio receiver by imposing wide band interference signals. An interference generator ( ) produces a wideband interference signal ( ). This interference signal ( ) is combined with a test signal ( ) generated by a channel generator ( ). This combined signal is received by the unit under test ( ). The unit under test ( ) is insensitive to the interference signal ( ) and receives the result signal ( ). The result signal ( ) is compared to the test signal ( ) to check for reception errors. If errors are detected, the wideband interference signal ( ) is subdivided and retested in an iterative manner until the band is small enough to perform single frequency tests to locate the frequency causing the error.

Ultrasonic Radiotelephone For An Automobile

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US Patent:
54105870, Apr 25, 1995
Filed:
Mar 1, 1993
Appl. No.:
8/024722
Inventors:
Randall L. Grunwell - Suwanee GA
Assignee:
Matsushita Communication Industrial Corp. of America - Peachtree City GA
International Classification:
H04M 1100
US Classification:
379 56
Abstract:
A car radiotelephone system having one or more wireless handsets communicating voice and control information via an ultrasonic link with a stationary unit connected functionally to a base station. The base unit (1) is connected by two cables, an audio-out cable (a) connected to the radio frequency receiver (2) and an audio-in cable (b) connected to the radio frequency transmitter (3), to a stationary transmitting/receiving unit (4). The stationary transmitting/receiving unit consists of two summing amplifiers, transmitting summing amplifier (5) and receiving summing amplifier (6), and any number of ultrasonic transmitters and receivers. Likewise, any number of handsets can be used. The handsets (15) comprise an ultrasonic receiver (19), an ultrasonic transmitter (20), transmitter and receiver circuitry (27), a keypad (28), display circuitry (29), microphone (30), earpiece/speaker (31), and a rechargeable battery and ringer. Each ultrasonic transmitter in the stationary unit and the handsets operate at a different frequency or other independent non-interfering methods so as to permit full duplex transmission.

Transceiver Having Retractable Antenna Assembly

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US Patent:
56359438, Jun 3, 1997
Filed:
Oct 16, 1995
Appl. No.:
8/543363
Inventors:
Randall L. Grunwell - Suwanee GA
Assignee:
Matsushita Communication Industrial Corp. of America - Peachtree City GA
International Classification:
H01Q 124
US Classification:
343702
Abstract:
A transceiver (10) having a retractable antenna (12) that substantially reduces interference when the antenna is in a retracted position. The transceiver (10) includes transceiver circuitry (T), operating at a predetermined frequency, electrically connected to the retractable antenna (12). The retractable antenna (12) includes two antenna elements (20, 22). A first antenna element (20) comprises a whip antenna element, movable within a conductive tube (14) housed within a cellular telephone case (C). A second antenna element (22) comprises a helical coil antenna element extending from the whip antenna element (20) and located outside the case (C). In the retracted position, a first contact assembly (76) contacts the whip antenna element (20). The first contact assembly (76) is electrically connected to the transceiver circuitry (T) through a conductor (96) which is a predetermined multiple of a quarter wavelength at the predetermined frequency. In the retracted position the whip antenna element (20) and the conductive tube (14) form a coaxial transmission line so that only the helical coil antenna element (22) is electrically active and the whip antenna element (20) does not radiate internal to the case (C).

Pseudo Tapered Lines Using Modified Ground Planes

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US Patent:
51190486, Jun 2, 1992
Filed:
Nov 5, 1990
Appl. No.:
7/609343
Inventors:
Randall L. Grunwell - Royal Palm Beach FL
International Classification:
H03H 738
US Classification:
333 34
Abstract:
A network (10) for matching impedance from a first transmission line (14) to a second transmission line (16) includes a dielectric material (12, 20), a conductor (24, 26, 28), and metalization (18, 30) located on at least some portions of at least one outer surface of the dielectric material. The area covered by the metalization gradually diminishes from the first transmission line to the second transmission line. The conductor provides an electrical connection between the first transmission line and the second transmission line. The conductor provides an electrical connection between the first transmission line and the second transmission line, and is located at least partially within the dielectric material.

Wide Band Transmission Line Impedance Matching Transformer

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US Patent:
51402882, Aug 18, 1992
Filed:
Apr 8, 1991
Appl. No.:
7/681247
Inventors:
Randall L. Grunwell - Royal Palm Beach FL
Assignee:
Motorola, Inc. - Schaumburg IL
International Classification:
H01P 500
US Classification:
333 34
Abstract:
An impedance matching transformer includes a dielectric having a varying thickness between opposing surfaces. A transmission conductor and a return conductor are formed on the opposing surfaces. The impedance transformation between a first terminal and a second terminal is proportional to the thickness variation of the dielectric.

Filter Having A Variable Response Time For Filtering An Input Signal

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US Patent:
54993920, Mar 12, 1996
Filed:
Jul 19, 1994
Appl. No.:
8/277226
Inventors:
Randall L. Grunwell - Suwanee GA
Assignee:
Matsushita Communication Industrial Corporation of America - Peachtree City GA
International Classification:
H03L 7099
H03H 1100
H04B 116
US Classification:
455260
Abstract:
A tunable filter (25) is described for use in loop control circuits. The filter (25) has a time constant which is determined by a resistor (40) and a capacitor. The capacitor is simulated by the series combination of an impedance converter (41) and a variable resistor, such as a field effect transistor (42). The resistance of the transistor (42) is determined by a control signal present on a control line (32) and the impedance converter (41) converts the resistance into an equivalent capacitive reactance. Therefore, the control signal on the control line (32) effectively controls the capacitance present at a node (43) and, in conjunction with the resistor (40), determines the time constant, and therefore the response time and bandwidth, of the filter (25). Multiple pole, lowpass, bandpass, highpass, and bandstop filters can be constructed. The impedance converter (41) uses a very small capacitor to simulate a large capacitance value at the node (43).
Randall L Grunwell from Suwanee, GA, age ~65 Get Report