The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 2026
Filed:
Mar. 15, 2024
Motorola Solutions, Inc., Chicago, IL (US);
Jesus F Corretjer, Weston, FL (US);
Daniel C Altenhofen, Deforest, WI (US);
Anuj Kapoor, Palatine, IL (US);
Shivakumar Bangalore Ramu, Weston, FL (US);
Ernesto Fiallo Herrera, Sunrise, FL (US);
MOTOROLA SOLUTIONS, INC., Chicago, IL (US);
Abstract
A communication system embeds a trust message into an outbound control channel signal derived from a GPS reference signal associated with trunked communications. The trust message is used as a basis for incrementally expanding the subscriber's automatic frequency control (AFC) range beyond its pre-stored default limits to enable re-tuning a temperature compensated crystal oscillator (TCXO) that has drifted off frequency. Coarse-tuning of the subscriber TCXO is based on a measured frequency error of a control channel outbound transmission determined to fall within the expanded AFC range of the subscriber. Additionally, an inbound signal frequency error may be measured by the base station, and reported to the subscriber to use for fine-tuning the TCXO.