Telecommunications – Transmitter – With electrical protection of transmitter circuit or operator
Patent
1987-07-02
1989-01-31
Caldwell, Sr., John W.
Telecommunications
Transmitter
With electrical protection of transmitter circuit or operator
455108, 330207P, 330298, H01Q 1112
Patent
active
048022373
ABSTRACT:
The present invention relates to a device for use in an amplitude modulated RF transmitter. The device protects power transistors located in the RF transmitter particularly in the modulator and power amplifier portions of the transmitter. The device is comprised of a capacitor unit which is adpated to be charged in a first direction; a detector which detects an audio modulating signal; and a discharge unit which is connected to both the capacitor unit and the detector which selectively discharges the capacitor unit when the value of the audio modulating signal reaches a first preset level for a preset time duration during a portion of the audio modulating signal which causes positive modulation of the RF transmitter. The device also comprises a switch unit connected to the capacitor unit and which is activated when the capacitor unit discharges to a predetermined level. The switch unit is operable to remove, when activated, the audio modulating signal from the power transistors. A reset unit is provided for resetting the discharge unit and recharging the capacitor unit when the level of the audio modulating frequency drops to a second preset value.
REFERENCES:
patent: 4234967 (1980-11-01), Henschel
patent: 4307349 (1981-12-01), Thorpe et al.
patent: 4378580 (1983-03-01), Stich
patent: 4392245 (1983-07-01), Mitana
patent: 4486720 (1984-12-01), Hirano
Baker John A.
Caldwell Sr. John W.
Queen Tyrone
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