Importance

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Abstract

A process for neutralizing a tube of a high power digital radio broadcasting transmitter includes modulating two quadrature signals I(t), Q(t) at a transmission frequency (F.sub.0) by a modulator to control a grid of the tube which is configured to work at saturation with a gain V.sub.2. A phase-modulated input signal E(t) output from the modulator is amplified by an amplifier which is configured to work at saturation with a gain V.sub.1. The input signal E(t) is predistorted by digital means so as to compensate for an undesirable coupling between an anode and the grid of the tube of the transmitter so that an output of the transmitter corresponds to a desired output signal S(t). A corrector signal W(t) is calculated using the expression W(t)=jg(t)S(t).

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First Claim