Abstract: A booster capable of preventing itself from adversely influencing a base station. This booster comprises a plurality of downstream signal amplifying parts (111-1 to 111-4) and a plurality of upstream signal amplifying parts (112-1 to 112-4). A received signal analyzing part (116) analyzes the perch channel information of a signal received from a base station to generate analysis information. When the analysis information shows that the reception quality of the received signal is below a threshold value, halt control parts (118,124) halts the operations of those ones of the downstream signal amplifying parts (111-1 to 111-4) and upstream signal amplifying parts (112-1 to 112-4) that are related to that analysis information.

Abstract: A booster capable of preventing itself from adversely influencing a base station. This booster comprises a plurality of downstream signal amplifying parts (111-1 to 111-4) and a plurality of upstream signal amplifying parts (112-1 to 112-4). A received signal analyzing part (116) analyzes the perch channel information of a signal received from a base station to generate analysis information. When the analysis information shows that the reception quality of the received signal is below a threshold value, halt control parts (118,124) halts the operations of those ones of the downstream signal amplifying parts (111-1 to 111-4) and upstream signal amplifying parts (112-1 to 112-4) that are related to that analysis information.

Abstract: A gain of a receiving amplifier can be measured by inputting pilot signals each having a different frequency into an input side and an output side of the receiving amplifier respectively, then detecting these pilot signals respectively by a main apparatus having an abnormality detecting function, and then comparing their relative values.

Abstract: An oscillator circuit including a metal plate secured to a dielectric substrate. A micro strip line is mounted on the dielectric substrate. One end of the micro strip line is connected to the gate terminal of a field effect transistor for microwave oscillation and the other end of the micro strip line is grounded to the metal plate via a terminal resistor. A dielectric resonator is secured with an ordinary adhesive to the inner wall of a shield case. Attaching the dielectric resonator to the shield case allows the degree of coupling, defined by the distance between the micro strip line and the dielectric resonator, to be freely set. A tuning screw is screwed through the metal plate and the dieletric substrate opposite to the dielectric resonator. The microwave oscillation circuit can be used with a down converter.

Abstract: A microwave oscillator includes a substrate having a circuit pattern on the top surface, a thin copper foil covering the bottom surface, and a hole. An electronic component is mounted to the top surface of the substrate. A metal plate is attached to the bottom surface of the substrate thereby closing the bottom of the hole. A dielectric resonator is attached to the metal plate through the hole. Since the dielectric resonator is attached to the metal plate by soldering, the bond between the dielectric resonator and the metal plate is stronger and more stable than that achieved by using a conventional adhesive. This enhances the reliability against temperature changes; mechanical impact or humidity.