SU362496A1 - MULTI-CHANNEL RADIO RECEIVER - Google Patents

Description

one

The invention relates to the field of radio engineering and can be used for interference-free reception of radio signals with amplitude or pulse modulation.

Multichannel radio receivers are known, containing in each channel serially connected linear part, detector, video amplifier, subtraction device, valve, output amplifier and indicator.

However, the known devices do not allow the suppression of out-of-band radio nodes.

In order to suppress out-of-band interference in the proposed radio receiver, each subtractive device is additionally connected to the outputs of video amplifiers of adjacent channels.

FIG. I is given a block diagram of the proposed radio receiver; in fig. 2 is a graph showing his work.

The proposed multi-channel radio receiver contains three channels k-1, k and k-f 1.

The linear part / of each receiver channel is a bandpass amplifier. The output of the linear part 1 is connected to the amplitude detector 2. Then the video amplifier 3 is turned on, from the output of which the video signals of one polarity are fed to the subtractor 4, and the video amplifier 3 of each

channel connected to the subtractive devices 4;; channel and K + I channel.

In each subtractive device 4, the subtraction from the signal of this

channel signals adjacent channels. From the subtracting device 4, the signal goes to the valve 5, which passes the difference signals only of the same polarity as the signals on the outputs of the video amplifiers 3.

The differential signals are amplified by the output amplifiers 6 and are fed to the output indicators 7, which are triggered by the sizing of the foam threshold signal intensity. iB each channel signals are passed only in

if their frequency lies within the bandwidth of the D / channel (Fig. 2). If the frequency of the signals goes beyond the limits of A /, then the difference signal in this channel

p., - f / K-i,

OR

f / p. K to - K-f-b

where up. k-difference signal in the k-th channel;

UK-signal to the input of the k-th channel;

UK-I and UK + I-signal coming to the k-th channel

from (k-1) -th channel and (k + 1) -th

channel.

When the polarity is reversed, an out-of-band interference occurs. The subject of the invention. A multichannel radio receiver, containing in series a linear part of a channel, a detector, a video amplifier, a subtraction device, a valve, an amplifier and an indicator, which are connected in such a way that, in order to suppress bandwidth radio interference, the subtraction device is connected to the output socket. adjacent channels.