SU1220109A1 - Device for discrete automatic controlling of sensitivity of radio receiver - Google Patents

Abstract

The noise immunity is increased at the moment of tuning the discretely tunable attenuator under the influence of powerful out-of-band interference. The signal through a discrete tunable attenuator I, path 2 of the preliminary selectivity of the radio receiver, key 3 and narrowband path 4 is fed to the output of the device. From the other output of the path 2, the signal through the detector 1 1 enters the threshold unit (PB) 8. In (PB) 8 the signal arrives at the threshold elements 12 and 13, the outputs of which are connected to the element SHSh 14. If the voltage from the detector 11, corresponding to the level interference, out of the dead zone PB 8, the reversible counter 6 with PB8 (element OR 14) receives a signal to enable the account. In this case, the reversible counter 6 pulses the clock pulse generator 5 changes its state depending on the voltage at the output of the threshold element 12. The signal of the reversible counter 6 through the decoder 7 is fed to change the transfer coefficient of the discrete tunable attenuator 1. The counting signal and pulse generator 5 is fed to the element And 9. The signal element And 9 starts the shaper 10 control signals which pulse is fed to the control input of the key 3. Key 3 disables the narrowband path 4 to eliminate the effects of switching noise. 1 W1. (L to 1C

Description

The invention relates to radio engineering and can be used in the composition of the receiving devices of the main communication.

The purpose of the invention is to improve the noise immunity at the time of the restructuring of the discretely tunable attenuator under the influence of powerful out-of-band interference.

The drawing shows a structural electrical circuit of a discrete automatic adjustment of the sensitivity of a radio receiver.

The device of discrete automatic sensitivity adjustment of a radio receiver contains a discrete tunable attenuator 1, path 2 of the radio receiver's preliminary selectivity, key 3, narrow radio path 4 of the radio receiver, generator 5 clock pulses, reversible counter 6, decoder 7 j threshold block 8, element I 9, driver 0 control pulse detector 1 1,

The threshold cell 8 contains, the first threshold element 12, the second threshold element 13, the element OR 14.

The device is discrete automatic.

12201092

the driver 10 is fed to the control input of the key 3, which turns off the narrow-band path 4 for a time. Thus, switching interferences, having a form at the output of the path 2 close to its impulse response, do not pass into the narrow-band track 4, and taking into account that the specified time is much less than O the duration of the element of the useful signal, defined as n / and FU where

20

iR „is the bandwidth of the narrow-band tract, there is no loss of information, i.e. increases to 15 with noise immunity.

Claims (1)

A device for discrete automatic sensitivity adjustment of a radio receiver, comprising a discrete tunable attenuator connected in series, the input of which is an input of the device, and the output is an output for connecting a radio receiver connected in series by a clock generator, a reversible counter and a decoder whose output is connected to control input of a discrete tunable attenuator, connected 25 This sensitivity adjustment of the radio-30 detector and the detector in series works as follows; beef block, first and second outs If the voltage at the output of the detector is connected, respectively, to torus 11, corresponding to the level along with the control inputs of the start of the count, the fur will leave the insensitive zone and the control input of the direction of the threshold block 8, it will determine my thresholds of the first and second threshold elements 12 and 13, then the output of the element OR 14 appears signal of the resolution of the account and with the arrival of a pulse from the generator 5, reversing 0 the impact of powerful out-of-band received in order to increase the noise immunity in oment adjustment discretely-tunable attenuator under conditions counter 6 will change its state by one in the direction of decreasing or increasing depending on the voltage at the output of the first threshold element 12. This will change the gain of discretely tunable attenuator I. At the same time, the counting resolution signal from the element OR 14 and the pulse from generator 5 is fed to element 9, which, at the time of their coincidence, starts shaper 10, which forms a pulse of duration t (j p / lRpr where) is the passband of path 2 I 3-5. The pulse from the output VNIIPI Order 1331/59 Filiap PPP Patent, Uzhgorod, ul, Proektna, 4 iR „is the bandwidth of the narrow-band tract, there is no loss of information, i.e. increases with noise immunity. DETAILED DESCRIPTION OF THE INVENTION A discrete automatic sensitivity adjustment of a radio receiver comprising a discrete tunable attenuator connected in series, the input of which is the device input, and the output is the output for connecting a radio receiver, connected in series by a clock generator, a reversible counter and a decoder whose output is connected with the control input of a discretely tunable attenuator, connected which are connected respectively to the inputs of the control of the beginning of the account and the input of the control of the direction of the account of the reversible counter, about m - the impact of powerful out-of-band ones, in order to increase the noise immunity at the time of the reorganization of the discretely tunable attenuator under conditions the key, the key and the element I connected in series, the first and second inputs of which are connected respectively to the output of the clock generator and the first output of the threshold unit, and the driver of the control pulse, the output of which is connected to the control input of the switch, are entered. A dinene is provided with an output of a preliminary selectivity path of a radio receiver, and the input and output of a key are respectively an output of track 1 a of preliminary selectivity and input 55 narrowband radio path. Circulation 816 Subscription