SU399074A1 - THREE-CHANNEL DEVICE OF AUTOL / ATHIC CONTROL OF THE HETERODINE FREQUENCY RADIO TELEGRAPHIC EQUIPMENT WITH FREQUENCY MANIPULATION - Google Patents

Description

one

The invention is from usit-s to signal demodulation devices and can be used in radio equipment designed to receive and process single-channel and multi-channel telegraph signals with a frequency manipulator.

There are known devices for automatically adjusting the frequency of a heterodyne of a radiotelegraph equipment with frequency manipulation, which contain a high-frequency amplifier, mixers, amplifiers of intermittent frequencies: Stot, heterodyne, a quartz filter, electromechanical filters, a frequency divider by two, a filter that separates the frequency, equal to “For the half-sum of frequencies,” press and “release, the phase detector and the reference frequency generator.

However, the known devices do not work reliably with additional "-presses and" squeezes and with low manipulation indices, when the spectral density of the signal shifts to the center frequency range.

In order to increase the stability of work with changes in the manipulation index and changes in the nature of the alternation of elementary parcels in the proposed device, the outputs of narrow-band filters are additionally connected to another input of the phase detector through the additionally introduced node for maximizing the energy of the spectrum of the signal and for the co2 signal

It is worth four amplitude detectors, two comparators and two switches of the type, while the inputs of amplitude detectors are connected to the inputs of the corresponding switches of the type of work, the outputs of the amplitude detectors are connected to the controlled inputs of the corresponding switches of the type of switches, and the second switch kind of work connected output

0 the first switch of the kind of work.

The drawing is a block diagram of the proposed three-channel device for automatic adjustment of the heterodyne frequency of radio-telegraph equipment with frequency shift keying.

The device contains sleeders 1, 2, and 3 and local oscillators 4, 5, and 6, which serve to bring each of the operating frequencies of the "press," release, and "medium to one frequency of the reference frequency generator

/ g / 11: hl / o- / g, / oozh; / o- / g, C / page). I o Putting the operating frequencies to one frequency allows. For all channels one phase detector 7 and a reference frequency generator 8. Narrow-band filters of the device 9,10 and U / tuned on a single frequency fa. Device

0 also contains a maximum allocation node 12;

energy spectrum signal. Amplitude detectors 13, 14, and 15 that are included in a node, produce voltages that are pro-key to the levels of the signals in the corresponding channels. At the comparator 16, the signal levels of the channels operating from the reduced frequencies of the "click," release are compared, in addition, it controls the first primary switch of the 17 kind of work. The level comparison is made by difference and fixed by a comparator. A. Amplitude detector 18 isolates the signal level from the output of the first-operating switch. At comparator 19, a comparison of the levels of the reduced press or release frequencies with the level of the middle frequency is made, and then the control of the second switch 20 of the type of work. The latter passes to the input of the phase detector 7 a signal at the frequencies of "pressing OR" release or middle frequency with the highest level.

When operating from a non-manipulated signal at the output of one of the amplitude detectors 13 or 14, a level is proportional to the amplitude of the non-manipulated signal at the output of filter 9 or 10. At the output of filter 11, there is no signal. Comparators 16 and 19 with the help of switches 17 and 20 of the kind of rayot pass a non-manipulated signal to the input of phase detector 7.

In the case of a manipulated signal, through the switch 17 of the type of work, the "press or" release frequencies are passed alternately to one frequency, depending on the alternation of elementary parcels. The switch 20 of the type of work passes the input of the phase detector 7 to the reduced frequencies of the "press," release or "average, depending on the change in ildex and the change in the nature of the manipulation.

Subject invention

Claims (2)

1.1 rechkanalnuyu device / in automatic frequency tuning of the local oscillator of radio-telegraph equipment with frequency manipulation, containing in each channel a mixer, one input of which is connected to the signal source, the other - to the local oscillator, a narrow-band filter connected to the output of the mixer, and narrow-band channel filters are tuned respectively, the frequencies of “pressing,” pressing out and the middle frequency, and the reference frequency generator connected to the phase detector, while the reference frequency generator and phase detector are common to all x channels, characterized in that, in order to improve the operation stability when the manipulation index changes and the nature of the elementary sequence turns, the outputs of narrow-band filters are connected to a different input of the phase detector through an additionally introduced node for maximizing the energy of the signal spectrum. 2. The device according to claim 1, characterized in that the node for extracting the maximum of the energy of the signal spectrum consists of four amplitude 0 detectors, two comparators and two switches of the type of work, while the inputs of the amplitude detectors are connected to the inputs of the corresponding switches of the type of work, the outputs of the amplitude detectors are connected via the corresponding comparators to the controlled inputs of the corresponding switches of the type of work, and the output of the first switch kind of work.