Stephen P Cahill

US Patent:

5204974, Apr 20, 1993

Filed:

Jun 21, 1991

Appl. No.:

7/719213

Inventors:

Stephen V. Cahill - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 1100
H04M 1100

US Classification:

455226

Abstract:

A system, and associated method, for measuring a signal level of a signal received by a receiver, such as a radio telephone. The signal received by the receiver is applied to a variable amplifier. The amplification of the variable amplifier is adjusted such that an amplified signal generated therefrom is within the dynamic range of an intermediate frequency circuit. The level of amplification required to position the signal level of the amplified signal within the dynamic range of the intermediate frequency circuit is measured, and the signal level of the signal received by a receiver is calculated.

US Patent:

51174499, May 26, 1992

Filed:

Apr 8, 1991

Appl. No.:

7/681658

Inventors:

Michael P. Metroka - Algonquin IL
Stephen V. Cahill - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04M 1100
G08B 522

US Classification:

379 58

Abstract:

Both paging and cellular radiotelephone functions can be combined in a small, lightweight, single device by sharing most circuitry. The apparatus can receive paging signals simultaneously with radiotelephone signals because of dual receivers (105 and 110). When the paged party receives a page, an alert tone, a vibration, a visual indication, or a voice message is used to alert the party. Information extracted from the paging signal can be stored in memory (101) for later use. The paged party can select among messages stored in memory. If a message contains a telephone number, the paged party can call that number using the radiotelephone function at the touch of a button. The apparatus's keypad (102) can be used to program the paging function receiving frequency, identification code and type of paging system.

US Patent:

51503840, Sep 22, 1992

Filed:

Sep 28, 1990

Appl. No.:

7/590401

Inventors:

Stephen V. Cahill - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 130

US Classification:

375 97

Abstract:

A communications receiver (103) comprising a carrier recovery apparatus having an adjustable response time loop filter (123) responsive to carrier signal parameters determined by a signal processor (141) is disclosed. Signal reception under fading conditions is improved by detecting the received signal parameters in an energy level determinator (207), a rate of change of energy level determinator (209) and a look-up table value (221) corresponding to a position of TDMA time clock (219).

US Patent:

61252867, Sep 26, 2000

Filed:

Jun 5, 1997

Appl. No.:

8/869543

Inventors:

Ketan R. Jahagirdar - Palatine IL
William P. Alberth - Crystal Lake IL
Rolland R. Hackbart - Buffalo Grove IL
Rashid M. Osmani - Mundelein IL
Stephen V. Cahill - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 138

US Classification:

455566

Abstract:

A portable communication device (102) includes a housing (105), a first display area (130), and a second display area (132). The first display area (130) is outwardly directed from a side (122) of the housing (105), and the second display area (132) is outwardly directed from a front (120) of the housing (105). The housing (105) may include a housing portion (114) movable to an open position and a closed position, where the second display area (132) is covered by the housing portion (114) when positioned in one of the first and the second positions.

US Patent:

52875563, Feb 15, 1994

Filed:

Sep 28, 1990

Appl. No.:

7/590415

Inventors:

Stephen V. Cahill - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 116

US Classification:

455266

Abstract:

A radio receiver having a variable bandwidth received channel filter (113,115) to reduce interference is disclosed. A interference is detected by comparing received signal strength and received signal BER. The bandwidth of the filter (113,115) is narrowed to improve BER when a received signal strength is greater than a threshhold value and BER is worse than a threshhold value.

US Patent:

50200763, May 28, 1991

Filed:

May 21, 1990

Appl. No.:

7/526156

Inventors:

Stephen V. Cahill - Palatine IL
Steven F. Gillig - Roselle IL
Thomas J. Walczak - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 2500
H04L 2700

US Classification:

375 5

Abstract:

A. pi. /4-shift DQPSK modulator modulates a digitized voice signal and other information. An FM modulator modulates the analog voice signal and other information. The FM modulator is coupled to the quadrature mixers (109 and 110) of the. pi. /4-shift DQPSK modulator. When an FM modulated signal is required, the mixers (109 and 110) are biased (114) to allow carrier feedthrough by applying a fixed, non-zero DC signal to one or both mixers (109 and 110). The carrier is then FM modulated using conventional methods such as voltage-modulation of a phase locked loop (PPL) (113). When. pi. /4-shift DQPSK is to be generated, the conventional baseband I and Q vector-length signals (101 and 102) are applied to the mixers (109 and 110), and the carrier is left unmodulated by switching (115) out the input signal to the PLL (113). The PPL (113) will then generate only the carrier frequency to be mixed with the I and Q vector-length signals (101 and 102).

US Patent:

54107415, Apr 25, 1995

Filed:

Mar 23, 1993

Appl. No.:

8/035778

Inventors:

Stephen V. Cahill - Palatine IL
Edward M. Roney - Grayslake IL

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

H04B 7005

US Classification:

455 69

Abstract:

The process of the present invention encompasses a method for automatically controlling the gain of a transponded modulation signal. The process receives a demodulated signal, detects whether SAT is present, and transmits the SAT. Before transmission, the transmitted SAT is adjusted for the gain of the modulator and for the gain of the receiver.

US Patent:

52611191, Nov 9, 1993

Filed:

Jun 21, 1991

Appl. No.:

7/719213

Inventors:

Stephen V. Cahill - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 1700
H04M 1100

US Classification:

4552261

Abstract:

A system, and associated method, for measuring a signal level of a signal received by a receiver, such as a radio telephone. The signal received by the receiver is applied to a variable amplifier. The amplification of the variable amplifier is adjusted such that an amplified signal generated therefrom is within the dynamic range of an intermediate frequency circuit. The level of amplification required to position the signal level of the amplified signal within the dynamic range of the intermediate frequency circuit is measured, and the signal level of the signal received by a receiver is calculated.