Browse Prior Art Database

SELECTABLE INTERNAL OR EXTERNAL RF PATH ACCESSORIES

IP.com Disclosure Number: IPCOM000006261D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-19
Document File: 3 page(s) / 156K

Publishing Venue

Motorola

Related People

Joseph Patino: AUTHOR [+3]

Abstract

Many mobile users are presently using portable radios in a vehicular charger and are simultaneously connecting a remote rf connector accessory to the radio to externalize the rfto a roof mount antenna. These same users also have a requirement to be able to exit the vehi- cle at a moment's notice with a remote speaker/ microphone accessory connected to the radio. Presently, this would require two accessories: an external rf con- nector, and a remote speaker/microphone. This entails the user disconnecting one accessory and reconnecting the other accessory every time the user goes from the "mobile mode" to the "portable mode" and vice versa.

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MOTOROLA INC. Technical Developments Volume 14 December 1991

SELECTABLE INTERNAL OR EXTERNAL RF PATH ACCESSORIES

by Joseph Patino, Daniel Nigro and Eric Brooks

  Many mobile users are presently using portable radios in a vehicular charger and are simultaneously connecting a remote rf connector accessory to the radio to externalize the rfto a roof mount antenna. These same users also have a requirement to be able to exit the vehi- cle at a moment's notice with a remote speaker/ microphone accessory connected to the radio. Presently, this would require two accessories: an external rf con- nector, and a remote speaker/microphone. This entails the user disconnecting one accessory and reconnecting the other accessory every time the user goes from the "mobile mode" to the "portable mode" and vice versa.

  Hence, there exists a need for one accessory to supply the capability of going from the mobile type application to the portable type application and vice versa, while mini- mizing the amount of connecting and reconnecting. To achieve this, an accessory needs to be created that contains the following features: l-a remote speaker/microphone, 2-a" external rf connector, and 3-a switch that selects internal or external rfpath. This accessory would eliminate the need for purchasing two separate accessories and would eliminate the need for having to disconnect and reconnect the accessories for every mode change.

  The switchable rfpath allows the user to switch from portable mode: internal rf path with external speaker and microphone selected, to mobile mode: external rf path with external speaker and microphone selected. The

external rfconnector allows the user to connect a remote roof top antenna or a rf PA to the radio when the exter- nal rf path has been selected via the rf path switch. The remote speaker/microphone allow for external speaker and microphone control in either the mobile or the port- able mode of operation.

  The switchable external rfpath is achieved by adding a switch to the option select lie to either toggle the state of the line or change ihe voltage level of that lie to indicate to the radio that an option class change has occurred. The radio would then internally switch the rf path to the corresponding path.

  The following is an example of how this would be accomplished in the voltage level example. A 1.235 Volt reference diode would be switched in or out of the option select lie path, depending on the position of the rf path switch. The circuit would be set up with one fixed 1.235 Volt reference diode wi...