Hot standby transmitter switching system using upper and lower s

Details Hot standby transmitter switching system using upper and lower s Hot standby transmitter switching system using upper and lower s

1989-12-19

1991-12-17

Kuntz, Curtis

Telecommunications

Transmitter

Plural separate transmitters or channels

455115, H04B 102

Patent

active

050739743

ABSTRACT:
In a hot standby transmitter system, each of a pair of identical transmitters, one of which is a primary and another one is a standby, includes 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. The RF switch selectively connects the output of the primary transmitter to an antenna. The standby transmitter undesirably outputs a small level of the primary sideband even though it should be theoretically 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 the high isolation amount required in a prior art method where the standby transmitter outputs the primary wave at a level as high as the primary transmitter level, in order to keep the ratio of the power level from the primary transmitter to the power level from the standby transmitter higher than a predetermined requirement level. The circuit for detecting a fall in the output power is simple compared to the complex circuit required in another prior art method where the standby transmitter outputs the primary wave at a lower signal level than the primary transmitter.

REFERENCES:
patent: 3754188 (1973-08-01), Wilkens
patent: 4584715 (1986-04-01), Baars et al.
patent: 4723307 (1988-02-01), Clark et al.
patent: 4926500 (1990-05-01), Tsuda et al.

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