Randall L Rich

US Patent:

6354481, Mar 12, 2002

Filed:

Nov 8, 1999

Appl. No.:

09/435650

Inventors:

Randall L. Rich - Plano TX
Shean R. Dalton - Koppell TX

Assignee:

Speedline Technologies, Inc. - Franklin MA

International Classification:

B23K 100

US Classification:

228 19, 228201, 228218, 219388, 134105

Abstract:

A compact reflow oven and cleaning apparatus combines in a unitary housing for both the reflow and cleaning function. This results in the saving of valuable floor space in the printed circuit board assembly areas. The unitary housing and control of temperatures in the reflow and cleaning areas facilitate the removal of contaminants before solidification of such contaminants.

US Patent:

6446855, Sep 10, 2002

Filed:

Feb 18, 1999

Appl. No.:

09/252377

Inventors:

Randall L. Rich - Plano TX

Assignee:

Speedline Technologies, Inc. - Plano TX

International Classification:

B23K 522

US Classification:

228 19, 228201, 228 42, 219388, 134105

Abstract:

A compact reflow oven and cleaning apparatus combines in a unitary housing for both the reflow and cleaning function. This results in the saving of valuable floor space in the printed circuit board assembly areas. The unitary housing and control of temperatures in the reflow and cleaning areas facilitate the removal of contaminants before solidification of such contaminants.

US Patent:

57582718, May 26, 1998

Filed:

Nov 25, 1997

Appl. No.:

8/978099

Inventors:

Randall W. Rich - Lake Villa IL
Richard J. Vilmur - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 106
H04B 700

US Classification:

4552341

Abstract:

A code division multiple access (CDMA) radio receiver (104) having gain receives a radio frequency (RF) signal (122) to produce a received signal (124). The quality (130) of the received signal (124) is determined (111). The quality (130) is preferably a ratio of an energy per chip of a desired signal (Ec) to a total power spectral density of the received signal (Io) (124). For alternative radio receivers (104) the quality (130) may be an error rate estimate of a demodulated signal (126). The gain of the radio receiver (104) is adjusted responsive to the quality (130) of the received signal (124) to optimize the quality (130) of the received signal (124). Further, since the adjusted gain also changes a received signal strength indication (RSSI) (242) of the received signal (124), the RSSI (242) of the received signal (124) is estimated (217) and compensated (218) responsive to the gain of the radio receiver (104) to produce a compensated RSSI (134) of the received signal (124) indicative of the RSSI of a desired RF signal (122).

US Patent:

52300935, Jul 20, 1993

Filed:

May 3, 1991

Appl. No.:

7/695500

Inventors:

Randall W. Rich - Palatine IL
Dale G. Schwent - Hoffman Estates IL
Rashid M. Osmani - Carol Stream IL

International Classification:

H04B 104
H01P 120

US Classification:

455126

Abstract:

A cellular telephone transmitter (100) includes a variable-gain power amplifier (102), the output of which is filtered and sampled by a filter (104) with an integral directional coupler. Filter (104) includes both a transmitter signal filter and a directional coupler on a ceramic block of one or more pieces. The directional coupler has been realized by two coupled transmission lines provided by the two holes (206 and 207) on the left side of the ceramic block, and the transmitter filter has been realized by five short-circuited coupled transmission lines provided by the five holes (201-205) on the right side of the ceramic block.

US Patent:

59404523, Aug 17, 1999

Filed:

Nov 29, 1995

Appl. No.:

8/564460

Inventors:

Randall Wayne Rich - Lake Villa IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 710
H04L 102

US Classification:

375347

Abstract:

A dual mode cellular radiotelephone subscriber unit (802) comprises a diversity receiver (812) and a controller (814). The diversity receiver (812) receives either a first radio frequency (RF) signal (808) modulated by a digital modulation method (805) or a second RF signal (810) modulated by an analog modulation method (807). In one embodiment, the controller (814) controls the diversity receiver (812) responsive to a first diversity algorithm (834) when the diversity receiver (812) receives the first RF signal (808) modulated by the digital modulation method (805), and responsive to a second diversity algorithm (836) when the diversity receiver (812) receives the second RF signal (810) modulated by the analog modulation method (836). In another embodiment, the controller (814) controls the diversity receiver (812) responsive to a first received information set (835) when the diversity receiver (812) receives the first RF signal (808) modulated by the digital modulation method (805), and responsive to a second received information set (837) when the diversity receiver (812) receives the second RF signal (810) modulated by the analog modulation method (807).

US Patent:

58624600, Jan 19, 1999

Filed:

Sep 13, 1996

Appl. No.:

8/713911

Inventors:

Randall Wayne Rich - Lake Villa IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 104

US Classification:

455116

Abstract:

A gain controller (130) for a radio frequency (RF) transmitter (102) controls a power level of a signal (123) transmitted within a predetermined range of output power levels. The gain controller (130) provides the first gain control signal (131) and the second gain control signal (133) responsive to an output power level control signal (150). The first gain control signal (131) controls a gain of a first variable gain stage (144) to vary the power level of the transmit signal (115) at an intermediate frequency causing the output power level of the transmit signal (123) to vary over a lower range of the predetermined range of output power levels. The second gain control signal (133) controls a gain of the second variable gain stage (120) to vary the power level of the transmit signal (121) at a radio frequency causing the output power level of the transmit signal (123) to vary over an upper range of the predetermined range of output power levels. The power control circuit (130) is advantageously utilized in a code division multiple access (CDMA) radiotelephone (100) to provide power control over an 85 dB range of power levels while minimizing sideband noise emissions, current drain, and complexity of the RF transmitter (102).

US Patent:

51878097, Feb 16, 1993

Filed:

Jun 8, 1992

Appl. No.:

7/896462

Inventors:

Randall W. Rich - Palatine IL
Rashid M. Osmani - Carol Stream IL
Thomas J. Walczak - Woodstock IL
Stephen V. Cahill - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 138

US Classification:

455 331

Abstract:

A gain control system for controlling signal levels of the signal received by a receiver. The gain control system is operable to control the signal levels of the signal when the signal is comprised of either a conventional, constant envelope signal, such as an FM signal, or a non-constant envelope signal, such as a TDMA composite modulated signal. The gain control system may be advantageously embodied in a dual-mode radiotelephone operable to receive both conventional, FM signals and TDMA, composite modulated signals.

US Patent:

51631598, Nov 10, 1992

Filed:

Jul 30, 1990

Appl. No.:

7/559775

Inventors:

Randall W. Rich - Palatine IL
Rashid M. Osman - Carol Stream IL
Thomas J. Walczak - Woodstock IL
Stephen V. Cahill - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 140
H04B 116

US Classification:

455 74

Abstract:

A frequency control system for a dual-mode radiotelephone (152-238; 252-320) operative to receive either an FM signal or a DQPSK signal. In a first embodiment, when operative to receive the FM signal, the frequency of the reference oscillator (192) of the radiotelephone (152-222) is maintained in a fixed relation with the frequency of the FM signal. When operative to receive the DQPSK signal, the reference oscillator (192) is maintained in a fixed relation with the frequency of the DQPSK signal as determined by a digital signal processor (212). In a second embodiment, when operative to receive the FM signal, the frequency of an offset control oscillator (320) is maintained in a fixed relation with the frequency of the FM signal. When operative to receive the DQPSK signal, the reference oscillator (292) is maintained in a fixed relation with the frequency of the DQPSK signal as determined by a digital signal processor (312).