Telecommunications – Transmitter – Plural separate transmitters or channels
Patent
1979-09-19
1980-12-09
Bookbinder, Marc E.
Telecommunications
Transmitter
Plural separate transmitters or channels
328163, 330124R, 330149, 358186, H04B 102, H04N 538
Patent
active
042388554
ABSTRACT:
A broadcast transmitter has the outputs of two high-power output stages combined for increased power. For enhanced reliability, two exciters or sources of broadband signals are provided, and a switch couples the signal from the selected exciter to a signal splitter. In the signal splitter, the selected signal is divided into two equal portions, and each portion is coupled to the input of one of the two high-power stages. Two surface acoustic-wave filters are provided for limiting the bandwidth of the signal as transmitted. The filters may have different phase characteristics in the passband. Two or more distortion correction arrangements are provided for predistorting the signal for correcting for differential gain, differential phase or incidental phase distortions arising in the high-power stages. In order to avoid cancellation of the combined output signal, each of the filters is coupled in the line between one of the exciters and the switch, so the signal selected by the switch and applied to the high power stages passes through only one filter. For improved compensation of distortion, each of the distortion correction arrangements is coupled in one of the lines between the signal splitter and the input of each high-power stage.
REFERENCES:
patent: 2840696 (1958-06-01), Beck et al.
Bookbinder Marc E.
Meise William H.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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