SU983569A1 - Automatic electronic counting meter of average frequency - Google Patents

Description

harmonics of the local oscillator due to the synchronization alternation (on

or mirror canapri

and the ability to work on different harmonics of the local oscillator when determining the harmonic number of the local oscillator, as well as the limited range of durations of the measured radio pulses due to the synchronization of the harmonic of the local oscillator of the lateral component of the spectrum (instead of the carrier) of the radio pulses measured.

The aim of the invention is to expand the range of frequencies and durations.

This goal is achieved by the fact that an automatic electron-counting average frequency meter containing a series-connected harmonic generator, a mixer, on the signal input of which the signal under study is fed, an amplifier, a detector, a heterodyne frequency control unit, a local oscillator whose output is connected to a harmonic generator and the counter input, the arithmetic unit and the speaker, and the frequency discriminator connected to the output of the amplifier and the control unit connected by its four outlets; Dam with the second input of the oscillator frequency control unit, with the second counter input, with the repeats and inputs of the arithmetic unit and the indicator, respectively, the reverse unit is entered, the first input of which is connected to the frequency discriminator output, the second input with the fifth output of the control unit, and the output of the reverse unit connected to the third input of the local oscillator control unit, while the output of the counter is connected to the second input of the arithmetic unit. The drawing shows the block diagram of an automatic electronic meter. The meter contains 1 harmonic generator, mixer 2, amplifier 3 detector 4, frequency discriminator 5, reversal block b, heterodyne frequency control block 7, heterodyne 8, control block 9, counters 10, arithmetic block 11 and indicator 12. The device operates as follows at once. An advantageous signal of the local oscillator 8 with a frequency fr, which can vary with the unit 7 of the frequency control of the local oscillator, is fed to the input of a harmonic generator, which forms a spectrum in a given frequency range. Mixer 2 performs frequency conversion of the signal under study. Amplifier 3 extracts and amplifies the differential intermediate signal.

frequency fpro fp conversion of the signal under study at the N-th harmonic of the local oscillator. If the frequency of the signal at the output of the mixer 2 lies outside the bandwidth of the amplifier 3, the heterodyne frequency control unit 7 searches for a signal - p. Adjusts the frequency of the local oscillator 8 from top to bottom until a signal appears at the output of the detector 4 and the voltage polarity changes at the output of the frequency discriminator 5 from positive to negative, which indicates the reception of a mirror channel and the transition of the carrier frequency of radio pulses at the output of amplifier 3 through the value f of the frequency tuned frequency discriminator 5 ..

The output signal of the frequency discriminator 5 is fed through the block b of the reverse to the input of the oscillator frequency control unit 7. The reverse unit 6 is a direct current amplifier with switchable by the commands of the control unit 9 for direct and inverse inputs, which allows automatic adjustment of the frequency on the specular or direct channel. When there is a signal at the output of detector 4 after changing polarity at the output of frequency discriminator-5 and reversal block b, the oscillator frequency control unit 7 switches to the frequency control mode and automatically adjusts the frequency of the local oscillator B until the intermediate frequency is equal to the frequency frequency discriminator settings; - Counter 10 measures the local oscillator frequency in a mirror channel. measuring the LO module 7 tunes (down) the frequency of the LO 8 to a new signal at the output of the detector 4 and polarity at the output of the frequency discriminator 5 from negative to positive (reception on the forward channel), at the same time the control unit switches block b reverse to invert mode. Then the local oscillator 8 frequency is automatically adjusted. Counter 10 measures the local oscillator frequency | () Reni on the direct channel. In the arithmetic unit 11, the frequency setting value of the frequency discriminator is recorded, the values of fg are entered into it, and then the carrier frequency is calculated.

The result is the nonsponsive "" microwave RF pulses under study and is displayed on the indicator 12. The control sequence 9 provides the necessary sequence of operations in time. The entered block b reverse allows the program

switch from direct to mirror channel and vice versa, which expands the range of measured frequencies.

Claims (2)

1. USSR author's certificate number 631837, cl. G 01 R 23/02, 1978. 2. Equipment for frequency and time measurements, Moscow, Soviet Radio, 1971, p. 202.