SU974295A1 - Radio pulse average frequency automatic electronic calculating meter - Google Patents

Description

(5) AUTOMATIC ELECTRONIC ACCOUNT

MEASURING MEDIUM FREQUENCY RADIO IMPULSES

1 The invention relates to engineering.

radio measurements.

An automatic electron-counting meter of the average frequency of radio pulses is known, containing two measuring channels, each node of which consists of a series-connected harmonic generator and a mixer, on the signal input of which a measured signal is fed, as well as a series-connected control unit, a counter and a harmonic number 1 unit .

However, the known automatic electron-counting meter has a low sensitivity when measuring the carrier frequency.

t

The purpose of the invention is to increase the sensitivity when measuring the carrier frequency. .

The goal is achieved by the fact that in an automatic electron-counting meter the average frequency of radio pulses.

containing two measuring channels, each of which consists of a series-connected harmonic generator and a mixer, on a signal input of which a measured signal is fed, as well as a series-connected control unit, a counter and a unit for determining the number of a harmonic, in each channel between the output of the mixer and. harmonic generator input

10 serially connected amplifier, frequency discriminator, frequency control unit and local oscillator are entered, the amplifier output is connected to the second input of the frequency control unit through the inserted detector, and the output of the frequency control unit is connected to one of the inputs of the control unit, the second output of the local oscillator of each channel is connected to the corresponding 20 input of the harmonic number identification unit, the fourth input of which is connected to the first input of the counter, the second input of which is connected to the second output of the local oscillator of one of channels. The drawing shows a structural diagram of an automatic electronic meter. The automatic electron-counting meter of the average frequency of radio pulses contains successively connected control unit 1, counter 2 and unit 3 for determining the number of the harmonic, as well as two measuring channels t and 5, each of which consists of series-connected 6 harmonic oscillators and a mixer 7, the signal input of which is fed to the measured signal, as well as connected between the output of the mixer 7 and the input of the generator 6 harmonics of serially connected amplifier 8, frequency discriminator 9, frequency control unit 10 local oscillator 11, while the output of amplifier 8 is connected to the second input of frequency control unit 10 through detector 12, and the output of frequency control unit 10 is connected to one of the inputs of control unit 1. The second output of local oscillator 11 of each channel k and 5 is connected to the corresponding the input of the harmonic number determining unit 3, the fourth input of which is connected to the first input of counter 2, the second input of which is connected to the second output of the local oscillator 11 of channel 4. The automatic electron-counting meter works as follows. The output signals of the local oscillators 11 with the frequencies c and c, which, depending on the control voltage from the control blocks 10 of the control of the heterogeneous home 11, vary, remaining close to each other, are fed to the inputs of the harmonic generators 6, which form the spectra in a given range frequencies, and completely cover the frequency range when the control voltage of the blocks 10 changes. The mixers 7 convert the signal under study. Intermediate frequency amplifiers 8 isolate and amplify the signals of the difference intermediate frequencies fpp and convert the signal under investigation to the same harmonic for both channels and 5 harmonics of the local oscillator 11, which is ensured by similar values of q and the local oscillators 11. If the frequencies of the signals at the outputs of the mixers 7 lie outside the bandwidths of the intermediate frequency amplifiers 8, then the frequency oscillator 10 of the local oscillator 11 searches for a signal — they change the control voltages at the inputs of the local oscillators 11 until a signal appears at the detector outputs moat 12 and such voltage variations (from positive to otpitsatelnomy) at the outputs of the frequency discriminator 9 which indicates the reception of forward channel when x. After the frequency discriminators establish 9 negative voltages at the outputs (after positive ones), which corresponds to the transition of intermediate frequencies and fnp through the nominal values of frequencies fnp.n. and fnp.vt. Frequency discriminator settings 9 Frequency Control Units 10 automatically adjust the frequencies of the local oscillators 11. As a result, the nominal banners of DOM. and so on. Difference of frequencies c - fc of local oscillators 11, while in N (the number of the working harmonic of the local oscillator 11) is less than the difference pr.n pr, n. nominal values of intermediate frequencies. The working harmonic number N is determined by the harmonic number determination unit 3 as the ratio of the difference pr.n - f pr-H. the nominal values of intermediate frequencies, which is constant and reproduced in block 3, to the frequency difference between the c and c local oscillators 11. The nominal value of ave. n. the intermediate frequency is recorded in counter 2; the frequency of the local oscillator 11 of the measuring channel is added N times to this value. The control unit 1 provides the necessary sequence of operations in time. The use of the radio pulse frequency discriminators as frequency discriminators 9 and the application of the principle of bitwise balancing provides a high speed automatic electronic counting meter in the study of radio pulses, strictly fixed values of ave. and f ave. intermediate frequencies provide the possibility of using matched amplifiers in the intermediate frequency to achieve high noise immunity and sensitivity.

Claims (1)

The claims are two meters, 5 of which are connected by a mixer, An automatic electronic / counter meter of the average frequency of radio pulses, containing a channel, each of it from a harmonic generator in series and a signal input of which a measured signal is supplied, as well as a control unit, a counter and a harmonic number determination unit connected in series, characterized in that in order to increase sensitivity when measuring the carrier frequency, in each channel between the output of the mixer and the input of the harmonic generator are connected in series amplifier, frequency 974295 6 discriminator, frequency control unit and local oscillator, while the output is usi. the alternator is connected to the second input of the frequency control unit through the introduced detector, and the output of the frequency control unit is connected to one of the inputs of the control unit, the second output of the local oscillator of each channel is connected to the corresponding input of the harmonic number determination unit, the fourth input of which is connected to the first input of the counter, the second input which is connected to the second output of the local oscillator of one of the channels.