Transmitter modulation limiter

Details Transmitter modulation limiter Transmitter modulation limiter

1976-03-25

1977-07-26

Richardson, Robert L.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 38, H04B 104

Patent

active

040386031

ABSTRACT:
A resistor is inserted between the audio signal and the primary winding of a conventional modulating transformer used in an amplitude modulated transmitter. The value of the resistor is selected to limit the peak signals into the transformer thereby limiting the peak instantaneous index of modulation to less than 100 percent.
A capacitor, coupled to the transformers secondary winding, forms a low pass filter with the impedance of the resistor as transformed by the turns ratio of the transformer. The resulting low pass filter attenuates undesired harmonics.

REFERENCES:
patent: 1825304 (1931-09-01), Burnside
patent: 2025595 (1935-12-01), Kozanowski et al.
patent: 2382567 (1945-08-01), Hollingsworth
patent: 2491590 (1949-12-01), Sorensen
patent: 3320536 (1967-05-01), Lockwood

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