SU68772A1 - Radio transmitter, made according to the modulation scheme by dephasing - Google Patents

Description

The present invention relates to transmitter circuits with modulated dephasing and with separate carrier and sideband emissions.

Methods for separation of carrier and side frequencies and their separate emission are already known.

A feature of the proposed radio transmitter according to the dephasing modulation scheme is that, in order to increase the transmitter's efficiency, the device that divides the indicated frequencies is oscillated from two channels, each of which is modulated by dephasing.

The proposed device is illustrated in a drawing. FIG. 1 shows a skeletal diagram of the device; FIG. 2 is a schematic diagram of a frequency separation device; FIG. 3 is a vector diagram explaining the operation of the separating device; FIG. 4 and 5 are two variants of the transmitter and in FIG. 6 and 7 are schematic diagrams of transmitters.

FIG. 1, the squares / and // are transmitters that have the output of ordinary amplitude-modulated signals, obtained with the help of modulators MI and Mj. The frequency of both transmitters is set by a common OG master oscillator through high-frequency UHF and UHF2 amplifiers.

When applying from the sound voltage line (curve a) to the inputs of the modulators in antiphase, it is obvious that the transmitters / and // will generate modulated oscillations (CJL and C curves) "positively and" negatively.

If these oscillations of the same frequency "are positively and negatively modulated, apply to some special oscillatory system K and radiate, then the oscillations at the radio receiver's input also modulated, and the amplitude of these oscillations will be doubled, in accordance with the sum of the oscillations in the receiver antenna (Q and C).

The use of the oscillatory system described above is particularly advisable for the transmitter according to the dephasing modulation scheme.

FIG. 2 oscillatory circuit /

265

is the output load of the transmitter / (Fig. 1), and the oscillating circuit // is the output load of the transmitter // (Fig. 1).

In the oscillatory system K, consisting of capacitance 9 and inductance 70, 13a and 136, there is a voltage U between points 2 and 3, and t / 24 between points 2 and 4, and (7-4 is equal to minus (7.23 () The oscillatory voltage taken at points O- / from the circuit // - (Wo1, will generally be out of phase with respect to the voltage f / 24 at some angle tp. The oscillations t / oiT 43 are modulated. The vectors of the lateral frequencies of these oscillations Lj and La and carrier L (fig. 3) will be equal in amplitude, respectively, under the condition of linearity of modulation and proper selection of the number of turns of self-induction 13a 136 (or communication with the contour of the inductance /).

Let the voltage U in the phase shifter rotate at an angle cp so that Q.2 will coincide in phase with the voltage / 24 and act out of phase with the voltage (/ 2 s, as the voltage U and (7c are modulated negatively, and / 23 24 “positively, then we produce the addition of the stresses f / o2 + 23 and C / o2 + 24 U, which is the resultant vectors:

/ 04) acting in one of the antennas will give the sum of the carrier frequencies of both transmitters,

C / 03 operating in another antenna, will give the sum of the side frequencies of both transmitters.

Thus, one antenna will radiate only side, and the other - only the carrier frequencies of both “negatively and“ positively modulated oscillations.

Variants of practical schemes are very diverse, depending on the way in which the "positive and" negative modulations are carried out, the phase shifter is selected inductively or capacitively, with which circuit or with which branch of the circuit it is connected, etc.

In the transmitter with modulation by dephasing, the variants shown in the skeletal circuits of FIG. 1, 4 and 5.

2GG

Here, the phase shifter is indicated by means of the PV, and reactive bonds are indicated by the xv and xc.

Two variants of practical transmitter circuits constructed in accordance with skeleton circuit 4 are shown in FIG. 6 and 7.

Here are indicated:

7 - transmitter tubes, 2 - blocking inductance, 3 - blocking capacitance, 4 - capacitance of a neutrodin capacitor, 5 - a coil of a neutrodin coupling, 6 - inductance of a "negative circuit, 7- capacitance" of the negative circuit, 8 - coil of antenna circuits with “Negative circuit; 9 — capacitor of the phase shifter; Yu — inductance of the phase shifter, 77-capacitance of the“ positive circuit, 72-inductance of the “positive circuit, and 7J-coupler of the antenna with the“ positive circuit.

FIG. b dotted line shows the neutralization circuit.

Subject invention

Claims (3)

1. A radio transmitter made according to the modulation scheme by phasing using two load circuits associated with both, counter-modulated in phase channels of the transmitter so that the resulting e. the radial lines excited in these circuits by both channels are anti-phase modulated in amplitude, characterized in that the resulting em. d. loops are provided on the diagonal of the bridge to separate the known method of oscillation of the side frequencies. 2. A radio transmitter according to claim 1, characterized in that as the shoulders of the bridge, one of which has an e. d. carrier, and on the second - emf sidebands, separate antennas are used to separate the carrier and sidebands. 3. The form of the radio transmitter according to claim 2, characterized in that as the other pair of shoulders of the bridge, the coupling coil halves are used with one of the circuits and the second circuit is connected between the midpoint of this coil and the ground through an additional phasing loop. FIG. one FIG. 2 FIG. 3 R g 2 Uh yy -L;