SU1495720A1 - Panoramic radio signal frequency meter - Google Patents

Abstract

The invention relates to radio metering technology and can be used to search, detect and measure the frequency of radio signals. The purpose of the invention is to expand the frequency range of measurements. The panoramic radio frequency meter contains a receiving antenna 1, a sweep generator 2, a local oscillator 3, a mixer 4, an intermediate frequency amplifier 5, a detector 6, a video amplifier 9, and a cathode-ray tube 10. The introduction of delay line 7 and sovraem element 8 allows for an extended frequency range an unambiguous visual estimate of the frequency of the signal by suppressing spurious signals received in the specular and combinational channels. 3 il.

Description

one

(21) 4351982 / 24-21

(22) 11/24/87

(46) 23.07.89. Bnhdo number 27

(72) V.I. Dikarev and V.V. Fedorov

(53) 62Go317 (088.8)

(56) USSR Author's Certificate No. 1272266, Clo G 01 R 23/00, 1985.

Dymova A. Io and Draw Radio Systems. - M .: Sovoradio, 1975, p. 426, rice 16o12. (54) PANORAMIC FREQUENCY MEASURING RADIO SIGNALS

(57) The invention relates to a radio metering technique and can be used for searching, detecting and measuring the frequency of radio signals. The purpose of the invention is to expand the frequency range of measurements. The radio frequency signal meter contains a receiving antenna 1, a sweep generator 2, an oscillator 3, a mixer 4, an intermediate frequency amplifier 5, a detector 6, a video clip 9, and a cathode ray tube 10o. extended frequency range to provide an unambiguous visual estimate of the signal frequency by suppressing spurious signals received on specular and combinational channels. 3 il.

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The invention relates to radio metering technology and can be used to search, detect and measure the frequency of radio signals in a wide frequency range.

The purpose of the invention is to expand the frequency range of measurements.

Figure 1 shows a structural diagram of a panoramic radio frequency meter} in figure 2 is a frequency diagram; figoZ - timing charts

The radio frequency meter contains a receiving antenna 1, a sweep generator 2, a local oscillator 3, a mixer 4, the second input of which is connected to the output of the antenna 1, an intermediate frequency amplifier 5, a detector 6, a delay line-7, a coincidence element-8, a second input which is connected to the output of the detector 6, the video amplifier 9 and the vertical electrode of the cathode ray tube (CRT) 10, the horizontal electrode of which is connected to the second output of the sweep generator 2.

Panoramic radio frequency meter works as follows.

The DA frequency range is viewed using the sweep generator 2, which periodically, with a period Td, changes the setting of the local oscillator 3 at the sawtooth law. At the same time, the sweep generator 2 forms a horizontal scan of the CRT 10, which is used as a frequency axis.

Received continuous signal

Ujt) Up cos (),

where Uj, f (., (f is respectively the amplitude, the carrier frequency and the initial phase of the signal,

from the output of the receiving antenna 1 is fed to the first input of the mixer 4, to the second input of which the voltage of the local oscillator 3 is applied to a linearly varying frequency

Ur (t) Ur cos (, t gytHcp),

where U | ... f jCfr- amplitude, frequency

and the initial phase voltage of the local oscillator 3;

V dj

 T,

the rate of change of the frequency of the local oscillator 3. At the output of the mixer 4, voltage of the combination frequencies is generated. The amplifier 5 allocates only the intermediate frequency voltage.

U, p (t) Upp, cos (2 „p t + n- t + tf.p),

five

0

five

0

five

where 0 K U (.. Up (K is a constant coefficient);

pr c g intermediate frequency;

H ol 4 0-Ch-gv the process of rebuilding the local oscillator 3 continuous signal falls into the passband f of the intermediate frequency amplifier 5 four times: in the mirror channel at the frequency f, in the main channel at the frequency f, in the first combinational channel at the frequency f and in the second combinational channel at the frequency f (Fig.2 and Za) o At the same time, c) the detector path. 6, in each period T of the adjustment of the local oscillator 3, four pulses are formed (FIG. 3b) with parameters

bfn

: T:

t - 2f.lL

Ss

 -. , g -) p „T,

Have

- 2fne. Have

Where

T -

duration and time interval between pulses, formed5

0

five

0

,,

when receiving a signal on the main and mirror channels;

Tj is the duration and time interval between pulses formed when the signal is received on the first and second combi- nation channels. The specified pulses go to the first input of the coincidence element 8 and to the input of the delay line 7, the delay time of which is equal to T (,).

The delayed pulses from the output of the delay line 7 (Fig. 3b) arrive at the second input of the coincidence element 8, the output of which produces one pulse corresponding to the reception of a continuous signal only through the main channel at frequency f (Fig. 3g). video amplifier

9 arrives at a vertical CRT electrode 10 "As a result, a pulse (frequency mark) is formed on the CRT screen 10, whose position on a horizontal scan uniquely identifies the carrier fg of the received continuous signal

Claims (1)

The panoramic frequency meter of radio signals allows the frequency range of measurements to be expanded while at the same time providing an unambiguous visual estimate of the carrier frequency of the continuous signal, which is achieved by suppressing spurious signals received on the specular and combinational channels. Invention Formula Panoramic radio frequency meter containing sequence / V “Ard / LO L / L | P l / rJf Thebes. g a receiving antenna, a mixer whose second input is connected via a local oscillator to the output of a sweep generator, an intermediate frequency cutter, a detector, and a series-connected video amplifier and a vertical electrode of a cathode ray tube, whose horizontal electrode is connected to the second output of the sweep generator, differing in that, in order to expand the frequency range of measurements, serially connected delay lines and a coincidence element are introduced into it, the second input of which combines is connected to the input of the delay line and the detector output, and the output of the coincidence element is connected to the input of the video amplifier, A0 I / jv / / Kf tfr t I 4 eleven I I P .t FI.5