William Scott Gilbert

US Patent:

6686812, Feb 3, 2004

Filed:

May 22, 2002

Appl. No.:

10/154298

Inventors:

William C. Gilbert - Phoenix AZ
Bogdan M. Izdebski - Peoria AZ

Assignee:

Honeywell International Inc. - Morristown NJ

International Classification:

H01P 512

US Classification:

333112, 333116

Abstract:

A layered directional coupler including conductive traces placed along predetermined axes for making contact with main and auxiliary signal lines. The axes are positioned at predetermined angles relative to each other to maximize the area for making contact thereto, which minimizes the size of the directional coupler. Ground planes are used to minimize parasitic coupling between the traces. The main and auxiliary signal lines are provided by inductively coupled juxtapositioned spiral coils which coupling maximize the characteristics of the coupler.

US Patent:

47332239, Mar 22, 1988

Filed:

Mar 26, 1987

Appl. No.:

7/031084

Inventors:

William C. Gilbert - Scottsdale AZ

International Classification:

G08B 2600
H04B 300

US Classification:

340505

Abstract:

Apparatus for monitoring the status of and controlling faults at remotely-located components in a single line communications system wherein return data signals from the components are transmitted in the 50 kHz to 200 kHz range, and coupled to the low pass filters commonly used to bypass the active components, thereby permitting the return of signals to the system head-end.

US Patent:

60471700, Apr 4, 2000

Filed:

Jul 29, 1997

Appl. No.:

8/902165

Inventors:

Roger L. Paulsen - Glendale AZ
Colin Semwayo - Phoenix AZ
William C. Gilbert - Scottsdale AZ

Assignee:

Honeywell Inc. - Minneapolis MN

International Classification:

H04B 110

US Classification:

455212

Abstract:

An improved squelch circuit which utilizes a phase-locked-loop (PLL) arrangement to track the carrier signal and identify when audio communication should be curtailed. The lock detect circuit of the PLL is used for a signal-to-noise monitor. As the loop locks and unlocks, the lock detect line pulses. These pulses are integrated to give a direct current (DC) level. This DC level is proportional to the signal-to-noise ratio of the carrier signal. The signal-to-noise level is monitored by the squelch gate until a threshold is passed. Falling below the threshold results in a squelching of the audio, when the ratio exceeds the threshold, then audio is commenced. The circuit is enhanced by the ability to automatically adjust the threshold level once the PLL has locked onto the signal. Further, in some embodiments of the invention, the PLL also adjusts its bandwidth if the receiver's bandwidth is changed, thereby allowing the PLL to monitor the signal and not open and close the squelch intermittently when the signal strength is only marginal.