Burst signal transmitter capable of producing correct transmission output in initial burst signal
First Claim
1. A burst signal transmitter comprising:
- ALC (automatic level control) means for controlling a level of a burst modulation signal to become constant;
supplying means for supplying an output of said ALC means to an antenna;
blocking means for blocking the operation of said supplying means for blocking the output supply to the antenna at a place between an output of the ALC means and the antenna for a predetermined time period after a power supply of said ALC means is turned ON; and
control means for controlling said ALC means and said blocking means.
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Accused Products
Abstract
In a burst signal transmitting apparatus for power-amplifying a burst signal to transmit the power-amplified burst signal, a correct transmission output can be obtained even in an initial burst signal after a power supply is turned ON. In this burst signal transmitting apparatus, a signal supply to a transmission antenna is blocked by a switch for a predetermined time period after the power supply is turned ON, but this signal is supplied to a dummy. During this time period, the initial burst signal is produced, and an automatic level control is carried out for this initial burst signal by way of an automatic level control loop constituted by a detector, an LPF, a differential amplifier, a reference voltage source, and a variable attenuator. Accordingly, the transmission level is converged to become constant. Thereafter, the burst signal is supplied to the transmission antenna by the switch, so that the operation is entered into the normal operation.
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Citations
11 Claims
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1. A burst signal transmitter comprising:
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ALC (automatic level control) means for controlling a level of a burst modulation signal to become constant; supplying means for supplying an output of said ALC means to an antenna; blocking means for blocking the operation of said supplying means for blocking the output supply to the antenna at a place between an output of the ALC means and the antenna for a predetermined time period after a power supply of said ALC means is turned ON; and control means for controlling said ALC means and said blocking means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification