The invention relates to a mounting for reducing noise amplifier working, by a pulse, in the microwave frequencies. / p & & p & a small part of the output signal of the amplifier 6 is derived in an associated channel by a first coupler 1, the amplitude of the pulses of the derived signal is greatly reduced by a limiter 3; the noise between the pulses can be treated in an amplification circuit 4 and in a phase shifter circuit 5 in such a way that, in combination with the main signal in a second coupler 2, the noise between the pulses is nullified. / p & & p & application to transmission amplifiers forming part of the assembly of a transmission - reception where the reception is done between the pulses of the emission.
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