Hot standby transmitter switching system

Details Hot standby transmitter switching system Hot standby transmitter switching system

H - Electricity

04

B

325/47

H04B 1/04 (2006.01) H03C 1/60 (2006.01) H04B 1/74 (2006.01)

Patent

CA 2005655

ABSTRACT OF THE DISCLOSURE In a hot standby transmitter system, each identical transmitters, one of which is a primary and another one 18 a standby, comprises an image-cancel type mixer, which outputs upper or lower sideband waves of a local frequency, according to its internal connection controlled by a switch controller. The switch controller controls the internal switches and an RF switch, so that the primary transmitter outputs a predetermined primary one of the sidebands and the standby transmitter outputs another sideband, and the RF switch selectively connects the output of the primary transmitter to outside. The standby transmitter undesirably outputs a small level of the primary sideband though it should be theorectically zero. This low level primary wave component in the standby transmitter's output allows a reduction in the isolation amount of the RF switch, compared with high isolation amount required in a prior art method where the standby transmitter outputs the primary wave in as high as the primary transmitter level, in order to keep the ratio of power level from the primary transmitter to the power level from the standby transmitter higher than a predetermined requirement level. The circuit to detect a fall in the output power is simple compared with a complex circuit required in another prior art method where the standby transmitter outputs the less primary wave than the primary transmitter.

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