SU122185A1 - Device for automatically measuring and recording field strengths - Google Patents

Description

Devices are known for automatically measuring and recording a field strength value containing a radio receiver, a trigger generating a pulse with a duration proportional to the field strength being measured, and a recording unit that continuously records the signal level on photo paper or photographic film.

The disadvantages of such devices are in the relatively slow measurement process and the complexity of processing the data obtained, due to the need for additional processing of the waveforms, whereby the measurement results become known only after a certain time after the end of the measurements.

In the described device, these disadvantages are eliminated by applying a master oscillator and coincidence stages, the outputs of which are connected to the inputs of the coding scheme, which serves to convert the signal from the activated coincidence stage, in which the signal from the distributor and the signal corresponding to the falling edge of the trigger pulse are compared in time The five-digit Bodo code.

The Bodo code is fed to the input of the ST-35 telegraph apparatus and is worked out on the tape in the form of a specific figure characterizing the magnitude of the intensity of the field at the input of the radio receiver.

The block diagram of the described device is shown in the drawing.

The DC signal from the output of the AGC detector of the radio receiver 1 is fed to a DC amplifier 2 with a linear amplitude response. Amplifier 2 is connected to the grid circuit of a pulse-impulse modulator 3, for which a jet trigger with one stable position is used. The trigger is triggered from the pulses of the master clock generator 4. The frequency of the clock pulses, determining the time between two # 122185-2 -

With discrete metering, it is in the order of 5 hertz to the fraction of hertz.

A trigger-generated pulse with a duration proportional to the level of the signal at the input of the device is applied to matching cascades 5-14, which perform the function of an analyzing unit.

For each of the cascades of match 5-14, a pulse is applied from the corresponding triggers with one steady state (Sections 15-24).

The distributor is triggered by pulses of the master clock generator 4 with a time shift of about 30 ms to compensate for the initial pulse width of the trigger of the pulse-width modulator 3 corresponding to a zero input voltage. The delay is accomplished using the trigger 25.

When the end of the pulse pulse of the pulse-width modulator coincides with the trigger-distributor pulse at its output, a pulse corresponding to a certain amplitude of the input signal is output.

The presence of ten channels allows the entire voltage range of the input signal to be divided by voltage into ten different stages and, by the presence of an output pulse in one or another channel, it is possible to judge the magnitude of the input signal. To record the channel number. On the tape of the telegraph apparatus, the coding of the output pulses taken from the matching stages of the analyzing unit is used.

Triggers 26-29 force pulses of such duration that the end of a pulse created by trigger 26, for example, corresponds in time to the middle of the 26th pulse in the code, the end of the pulse generated by trigger 27, the middle of the 27th pulse in the code, etc.

The pulses from the trigger codes 26-29 are applied to the corresponding coincidence cascades 3 (7-33.

Simultaneously with the launch of the trigger code 26-29, the launch trigger 34 and the distributor trigger codes 35-38 are triggered.

The code distributor, by analogy with the analyzing unit, ensures the coincidence of the end of pulses of code triggers, which determine the temporal distribution of pulses in the code, with the pulses of the code distributor and the formation of a code sequence of pulses.

Formation of impulses received at the output of the coincidence cascade, pulses with a duration corresponding to the duration of the code send of the ST-35 apparatus, are triggers of formation 39 and 40. Finally, the code is formed in the starting circuit and the working parcels 41, where the addition of pulses from the cycle trigger code 42 and from the trigger of the formation of the duration of the pulse code.

Subject invention

A device for automatically measuring and recording a field strength, containing a radio receiver, a trigger generating a pulse with a duration proportional to the field strength being measured, and a recording unit, characterized in that, in order to speed up the measurement process and simplify the processing of the received data, It uses a master oscillator and a cascade of matches, the outputs of which are connected to the inputs of a coding circuit, which serves to convert the signal from the triggered cascade of matches to the five-digit code Bo up to the input of a direct-printing telegraph unit ST-35 for recording measurement results on a tape.