Motorola Corporation

William G Siegel

Michael J DeLuca

Walter L Davis

Linda M Trine

Kazushige Sakou

David J Guizerix

Unwanted audible noise on a mixed voice data channel is reduced by disabling an audio output device in a radio receiver or transceiver when the receiver determines that the RF signal received contains binary digital bit data. Alternatively, the receiver enables the audio output device when it determines that the RF signal received does not contain binary digital bit data.

Method and apparatus for squelching dependent on detected bond rate to

A selective call personal paging radio receiver has audio and visual means to alert the user when he or she receives a selective call transmission. The audio alerting means has low and high volume modes and a three position slide switch selects either the low volume, high volume, or power OFF modes. The switch also has an integral momentary contact push switch function. When the switch is moved from the OFF position to either the low or high volume mode and the push switch function is activated within a first predetermined time after the switch is moved and maintained activated for a second predetermined time, a distinctive alert sequence is generated and then the silent alert mode is entered. In the silent alert mode, the audio alerting means is disabled and the visual alerting means remains active.

Selective call radio receiver silent alert mode entry system

A radio paging test system for testing the sensitivity of a radio receiver which receives a group of transmitted signals from a transmitter. Each transmitted signal in the group of transmitted signals is detected ad then compared to a reference signal to determine the degree of similarity between the reference signal and the detected signal. Each detected signal is classified either as a missed page, a non-page or a decoded page depending on the degree of similarity between the detected signal and the reference signal. In one mode of operation the classification of each detected signal is indicated by a classification signal which may be utilized to activate an alert such as a transducer or LED. Each classification signal may be directed to a computer input for analysis. In another mode of operation the classification signals are further analyzed to determine if the pager sensitivity is above, below or at a predetermined level. An alert indicating the pager sensitivity is then generated.

Radio paging device with improved test modes

A DC to DC converter includes a power input for receiving power at a predetermined input voltage. The converter is current-controlled to provide output power at a predetermined output voltage and several output current levels. The converter is further selectively controlled for either continuous or intermittent mode of operation. The continuous mode provides the higher output current levels and the intermittent mode provides the lowest output current level.

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Plantation, FL, United States of America

William G Siegel