CS262781B1 - One-zone amplitude modulator arrangements - Google Patents

Description

3 4 262781

The invention relates to the connection of a single-band amplitude modulator. For short-wave ionospheric connections from interference interference, a single-band amplitude modulator is preferred. The prior art circuitry comprises a carrier signal source, a modulation signal source, a carrier signal phaser, a modulator signal generator, two balanced modulators, a two-input adder circuit, the main disadvantage of the known circuitry of balanced modules, their four electronic elements must have the same volt-amp characteristics.

The disadvantage is eliminated by the connection of a single-band amplitude modulator according to the invention, wherein the output of the carrier signal source is connected to the first input of the summing circuit, the output of the first modulator is connected to the second input of the summing circuit, the output of the carrier phaser the signal is coupled to the third input of the summing circuit and the output of the second modulator is coupled to the fourth input of the summing circuit.

The main advantage of integrating a single-band amplitude modulator according to the invention is that by using two single-amplitude modulators and a four-input addition circuit, a single-band amplitude modulated signal is obtained by the printed carrier wave.

In the accompanying drawing, a block diagram of a single-band amplitude modulator is shown schematically.

The connection of a single-band amplifier modulator consists of a carrier signal source 1 with an output coupled to a high-frequency input of a first modulator 3a with a carrier input of a carrier signal 4a with a first input of the addition circuit 7, of a first modulator 3 with an output coupled to a second input of the addition circuit 7 , a carrier signal carrier 4 with an output coupled to the high frequency input of the second modulator Bas through the third input of the signaling circuit 7, from a modulation signal source 2 with an output coupled to the modulation input of the first modulator 3 and the input of the 5 s modulating signal the output associated with the modulation input of the second modulator B, from the second modulator 6 with the output connected to the fourth input of the addition circuit 7, from the addition circuit 7 with the output connected to the output terminal 8.

The high frequency input of the first modulator 3 is supplied with a sinusoidal signal from the output of the carrier signal source 1, wherein the modulation input of the first modulator 3 supplies a sinusoidal signal from the output of the source signal 2. At the output of the first modulator 3, a sinusoidal waveform of the carrier signal is produced, a positive cosine signal. the progression of the left side modulated band, the negative cosine waveform of the right side modulated band and supply the second input of the summing circuit 7, the carrier signal being output from the source 1 of the carrier signal is supplied to the first input of the summing circuit. Here, the first and second input circuits represent two primary counter windings of the summing circuit 7, thereby suppressing the carrier signal with the sinusoidal waveform. Further, the high frequency input of the second modulator 6 is supplied via the carrier signal phaser 4 to the sinusoidal signal from the output of the carrier 1, and the sinusoidal signal of the source of the modulation signal 2 is applied to the modulation input of the second modulator 6 via a modulator signal 5, wherein in addition, the carrier signal phaser 4 and the modulation signal phaser shift the phase of both signals by ninety degrees. At the output of the second modulator 6, the nasal waveform of the carrier signal, the positive sinusoidal waveform of the 1 'side modulated band, and the positive cosine waveform of the right side modulated band are fed to a fourth input of the adder circuit 7, wherein a cosine waveform is output from the output of the carrier signal phaser to the third input of the flux circuit, while the third and fourth inputs of the adder circuit represent two counter-current primary windings of the adder 7, thereby suppressing the carrier signal with a sinusoidal waveform. Thus, a single-band amplitude-modulated signal is outputted to the output terminal 8 connected to the summing circuit output 7 by adding the difference and the sum of the cosine waveforms of the left and right side modulated bands to the suppressed right side band with the suppressed carrier signal.

The connection of the single-band amplifier modulator according to the invention can be utilized by the transmission technique, especially for short-wave connections by reflection from the ionosphere.

Claims (1)

SUBJECT Connection of a single-band amplitude modulator consisting of a carrier signal source with an output associated with a high-frequency input of the first modulator and a carrier signal phaser input, a modulation signal source with an output associated with a modulation input of the first modulator and a modulator signal input a high frequency input of the second modulator, a modulation signal phaser with an output associated with the modulation input of a second modulator of the invention, a first modulator and a second modulator, an addition circuit with an output coupled to an output terminal, wherein the output of the carrier the first input of the addition circuit (7), the output of the first modulator (3) being connected to the second input of the addition circuit (7), the output of the carrier signal phaser (4) is connected to the third input of the addition circuit (7); the output of the second modulator (6) is connected to the fourth input of the adder circuit (7).