Browse Prior Art Database

AUDIBLE VSWR DETECTOR FOR PORTABLE REPEATER

IP.com Disclosure Number: IPCOM000006148D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Dec-07
Document File: 1 page(s) / 42K

Publishing Venue

Motorola

Related People

James T. Wiggenhorn: AUTHOR

Abstract

The user of a portable radio has a significant detector using a directional coupler, a detector, a influence as to the radiated power of the transmitter comparator, an audio oscillator and the radio speaker. and its antenna. It is recommended to hold a radio two or more inches away when talking into it. This is both for user safety and to optimize the power The circuit would bei,designed to trigger the "555" oscillator if a voltage :level greater than a preset radiated. If a radio is held too close, a significant loss amount was exceeded. NThis would be, for example, in radiated power will occur. set to trip when the VSWR exceeded 21.

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MOIYlROLA INC. Technical Developments Volume 12 April 1991

AUDIBLE VSWR DETECTOR FOR PORTABLE REPEATER

by James T. Wiggenhorn

  The user of a portable radio has a significant detector using a directional coupler, a detector, a influence as to the radiated power of the transmitter comparator, an audio oscillator and the radio speaker. and its antenna. It is recommended to hold a radio
two or more inches away when talking into it. This is
both for user safety and to optimize the power

  The circuit would bei,designed to trigger the "555" oscillator if a voltage :level greater than a preset radiated. If a radio is held too close, a significant loss amount was exceeded. NThis would be, for example, in radiated power will occur. set to trip when the VSWR exceeded 21.

  This circuit would provide feedback to the oper- Additionally, the circuit could be enhanced to ator that the radio is held correctly by monitoring the provide an indication !of the VSWR level on the VSWR and causing an audible beep in the speaker if it display of the radio to further warn the user of the is not. The circuit would be composed of a VSWR problem.

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162 0 Motorola. Inc. 1891

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