SU842613A1 - Device for checking generators with linear frequency modulation - Google Patents

Description

The invention relates to radio engineering and can be used in measuring equipment to control the linearity of frequency variations of generators with linear frequency modulation. There are known devices for monitoring frequency parameters of linearly frequency-modulated 1 FMM radio pulses whose principle of operation is based on converting a signal with linear frequency modulation into oscillations of this frequency. frequencies using difl) of a quadrupole and measuring the parameters of these oscillations 11. The disadvantage of these devices is low Control accuracy The closest to the proposed technical entity is a device containing a modulator, a controlled oscillator, a delay line, a mixer, a gate, a frequency multiplier, a pulse number counter, a controlled delay element, and a G2 pulse gate generator. The disadvantages of the known device are the significant inertia of measurements and the presence of uncontrolled areas of long duration at the beginning and end of the radio impulse. This is due to the fact that for a liver it is sufficient that measurements are made in a differential: with a quadrupole it is essentially necessary to apply delay lines with a delay time of from one to ten percent of the signal duration. The lack of synchronization between the gating imperial; • the converted signal leads to significant measurement errors, and the use of the frequency multiplier; reversirovannogo sig.pa contribute to their increase. The objective of the invented-m is to increase the accuracy of the counter-linearity of frequency variations in different parts of the modulation characteristic of generators with linear frequency modulation. Delivered by 1; it is achieved by the fact that the device containing in series the connection -: -; that is, the modulator, control, generator, delay line, mixer, the second input of which is connected to the output of the controlled generator, as well as the generator of counting pulses and the number counter .p pulses, additionally introduced in series are the limiting amplifier, a differential circuit, an additional counter, a bpoc-comparison and

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Sources of information taken into account in the examination

1. USSR Authorship Certificate No. 593161, cells, G01 R 23/00, 1978.

2. Authorship certificate of the USSR No. 652500, cl. G01 R 23/00, 1979.

Claims (1)

The latter are connected to the I / O channel using a channel and subscriber amplifier unit and an interface switching unit as an extension of the main group of subscribers. The sampling line passes sequentially, first through the subscribers of the main group, and then through the subscribers of the additional group. If in the process of work an attempt is made to connect the same additional subscriber group to different I / O channels, the blocking block that simultaneously connects additional subscriber groups to the I / O channel prohibits this attempt and this subscriber group does not connect to any of the channels. input-output [1]. The disadvantage of the data exchange device is limited scope, since it does not allow more than one additional group of subscribers to be connected to the I / O channel. The closest to the proposed technical entity is a device for data exchange, which contains an input / output channel, the first input and output of which are the corresponding