SU985748A1 - Device for forming electronic frequency scale - Google Patents

Description

one

This invention relates to Camerenia technique and can be used. meters of amplitude-frequency characteristics in the ranges of ultra-high frequencies.

A device for forming an electronic frequency scale is known, which contains a sweep generator, a mixer in combination with a harmonic generator Cl 3.

The disadvantage of this device is that the laboriousness of the design implementation for the microwave range, since the use of a large number of active and passive elements in them leads to a significant number of adjustments in the manufacture, which is due to the fact that the existing methods of calculating these elements in the microwave range errors in the calculations of their topology, errors also result in the spread of the electrical parameters of the materials from which they are made.

It is also known a device for forming electronic frequency

scale containing generator shake-. frequency, connected to a directional coupler, to which a secondary & chu is connected is shorted at the end of the delay line, and an amplitude detector and indicator 2 are connected in series to the spread arm.

However, the known device does not only provide for obtaining a linear frequency scale in a wide frequency band.

The purpose of the invention is to obtain a linear frequency scale in a wide frequency band.

The goal is achieved by the fact that the delay line is made in the type of non-dispersive element, the HanpifM of the length of the coaxial cable, the length of which is 2 liters ft

frequency frequency step; Tm delay, arriving at the EIPENSE length of the delay line.

The drawing shows a block diagram of the proposed device.

A device for forming an electronic frequency scale contains x ir 1 c 1 oscillating frequency, connected to directional coupler 2, connected to the secondary arm, shorted to new lines 3 delays of length 2, equal to the given frequency scale step, the delay time coming to the unit of length of the delay line, and the amplitude detector 4 and the indicator 5 are connected in series to the extended arm.

The device works as follows.

The signal from the oscillating frequency generator 1 is fed to the input of the directional coupler 2 and from its output to the 3 delay line. He then passes line 3 of the delay, reflected from its closed end, returns to

Witel 2, the extended shoulder of the directional response, where the amplitude detector 4 is turned on, simultaneously a part of the generator 1 signal, having experienced attenuation of the directional coupler 2 (“27 dB), also falls on the amplitude detector 4, but the delay line 3 mines. As a result, an amplitude detector 4 produces a periodic low-frequency curve, the period of which corresponds to the change in the frequency of the generator 1 signal per liter of non-dispersive delay line 3 T const for the entire frequency tuning range of oscillator 1. To obtain a predetermined scale on the scale GW, the delay line 3 is selected equal to., f. where IT is a delay of 2 DG /

ka in line 3 delays per unit length S is the length of the delay line 3,4 f - the specified step of the linear scale.

The proposed device provides a linear frequency scale in a wide frequency range (octaves).

Claims (2)

Invention Formula An electronic frequency scale generating device comprising a oscillating frequency generator connected to a directional coupler, the coaxial terminal of the delay line is connected to the secondary arm, and an amplitude detector and an indicator are sequentially connected to the developed arm, in order to obtain linear scale, in a wide frequency band, the delay line is made in the nondispersive power unit, for example, a length of coaxial cable, the length of which is equal to „., where d is the specified length -frequency step size, C - delay time, the arrival-adhesive per unit length of the delay line. Sources of information taken into account in the examination 1 USSR Author's Certificate No. 333479, cl. Q 01 R 13 / ZO, 1970. 2. Measurements in: electronics. Handbook ed. B. A. Dobrokhotova. M.-L., Energie, 1965, p. 177-181 (prototype).