SU63394A1 - Device for frequency modulation of quartz oscillators - Google Patents

Description

The known frequency pathogens of radio transmitters with frequency modulation have a rather complicated scheme, as a result of the need to ensure high stability of their average (carrier) frequency. The question of stability is resolved much more simply by eating: it is to directly modulate the crystal oscillator.

The inventor has investigated various possible methods for modulating the frequency of an iBi crystal oscillator over fairly large limits, and as a result of this study, the best method has been identified, which is the subject of the present invention.

In the proposed device for frequency modulation of quartz oscillators with a jet lamp controlling the frequency of the oscillatory circuit, according to the invention, the intrinsic frequency of quartz: connected parallel to the circuit, is close to the frequency to which the latter is tuned.

FIG. 1, 2, and 3 are diagrams illustrating the I-CdO | C: tato | full of essence of the invention. Parallel quartz, which can be included between any

of the two electrodes, one is installed, the oscillating circuit L, С and the scheme of the reactive lamp RL are installed. Resistance Z ;. between the other and the pairs of electrodes can be any combination of active and reactive resistances, ensuring the presence of self-excitation. All such generator circuits are referred to as so-called intake circuits, since self-excitation of a mol-set occurs even without quartz in the presence of the L and C circuit. In the tightening mode, the L and C circuits are set close to the quartz frequency It is also close to the frequency of quartz, stabilized last.

The scheme of reactivity, if properly performed, is equivalent to an additional mail capacity or self-induction, adventure parallel to the contour L, C. For | By varying the bias voltage on the grid of a jet lamp, this capacitance or self induction changes to change. most and the frequency of oscillations generated.

In such schemes, a change in L or C gives a rather large change in the frequency of the generator, thus allowing

direct frequency modulation with a iB pallet of a quartz circuit.

Although FIG. 1, 2, and 3 show the generators on: triodes, and the type of lamp is not of primary importance. In the schemes can be used tetrodes, pentodes and other types of lamps.

The design of the reactant lamp is also not critical.

According to these schemes, it is possible to modulate the frequency of KSiaptsev generators at any frequencies at which quartz is excited.

Subject invention

Devices for frequency modulation of quartz oscillators with a jet lamp that controls the frequency of the oscillating circuit is one that the iCio6 frequency of quartz connected in parallel to the circuit is close to the frequency to which the latter is tuned.