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Browse Prior Art Database

DUAL POSITION PRESS SWITCH FOR TWO WAY RADIOS

IP.com Disclosure Number: IPCOM000008120D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-20
Document File: 1 page(s) / 62K

Publishing Venue

Motorola

Related People

Stephen Harris: AUTHOR

Abstract

On two way hand portable and mobile radios, the single most important user control is the Press- To-Talk (PTT) button or switch. The operator must press this switch while they are speaking to key up the transmitter. This invention describes an enhancement to the standard PIT switch that pro- vides additional functionality and features without requiring additional controls.

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M-LA Technical Developments

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DUAL POSITION PRESS SWITCH FOR TWO WAY RADIOS

by Stephen Harris

  On two way hand portable and mobile radios, the single most important user control is the Press- To-Talk (PTT) button or switch. The operator must press this switch while they are speaking to key up the transmitter. This invention describes an enhancement to the standard PIT switch that pro- vides additional functionality and features without requiring additional controls.

  Conventional PTTs are binary in operation in that they are either pressed or off. With this idea the PIT has a partial and a fully depressed state. Only when the PTT is fully depressed will the radio transmit. The intermediate position can be used for various functio"s.

  One possible use for the intermediate position is as a channel monitor. On radios that use CTCSS or other signalling schemes, the operator should moni- tor the channel before transmitting to ensure that the channel is free. Currently this means pressing another button or control. With the dual PTT, the partial pressed position could be used to monitor the channel, allowing the operator to hear whether the channel is busy or free. If not busy, then continue and fully press to transmit. In what is essentially a single action the operator is able to both monitor

and transmit. With a normal PlT, a second switch would be required for this and would not be as easy to use. Besides being simpler to use, the likelyhood of the operator not monito...