Transmitter with power reduction to compensate for varying radiated electric field strength when switching between batteries and AC power
First Claim
1. In a radio transmitter of the type that is powered in the alternative from an internal power source or an external power source connected to the transmitter by an electrical conductor, and in which radiation by said electrical conductor increases the strength of the signal broadcast by the transmitter when the transmitter is powered from the external power source, the improvement comprising:
- means for reducing the power output of the transmitter when the transmitter is connected to the external power source.
1 Assignment
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Accused Products
Abstract
A radio frequency transmitter of the type that is adapted to be powered from an internal battery power source, or from an external power supply that is connected to the transmitter by an electrical conductor, which conductor acts as a part of the antenna system for such transmitter and increases the strength of the signal radiated by the transmitter when the transmitter is powered from the external power supply, and which includes a circuit for reducing the power output of the transmitter, when the transmitter is connected to the external power supply.
35 Citations
6 Claims
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1. In a radio transmitter of the type that is powered in the alternative from an internal power source or an external power source connected to the transmitter by an electrical conductor, and in which radiation by said electrical conductor increases the strength of the signal broadcast by the transmitter when the transmitter is powered from the external power source, the improvement comprising:
means for reducing the power output of the transmitter when the transmitter is connected to the external power source. - View Dependent Claims (2, 3, 4, 5)
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6. A low power radio frequency transmitter comprising:
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a modulated oscillator having an output; a microphone connected to said modulated oscillator; a driver-amplifier connected to said modulated oscillator by a coupling capacitor; a power amplifier connected to said driver-amplifier; impedance means switchably connected to the input of said driver-amplifier for shunting a portion of said input to ground; internal battery power supplying means connected to the modulated oscillator, driver amplifier and power amplifier; connector means coupled to the modulated oscillator, driver amplifier and power amplifier, and adapted to be connected to an external power source through a cable; and means coupled to the connector means responsive to the connection of said external power source for connecting said impedance means to ground.
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Specification