RU217093U1 - DEVICE FOR AUTOMATIC TURNING ON OF RADIO TRANSMITTING DEVICE - Google Patents

Abstract

The utility model relates to electrical and radio engineering, namely to systems of VLF and VLF radio transmitters and can be used in radio transmitters.

The technical result is to improve the quality of communication due to the timely unlocking for the operation of the radio transmitting device, which ensures that there is no loss of the beginning of the information message. 3 ill.

Description

The utility model relates to electrical and radio engineering, namely to systems for automatically switching on VLF and VLF radio transmitting devices and can be used in radio transmitters of the GOLIAF-2MK type.

Known radio transmitter ELF range. Product "Quarter-2" ZhYA1.200.292 P34. Equipment for generating excitation signals developed by NPO Komintern, Leningrad. 1991 Radio transmitter consists of exciter, power amplifier and control unit.

A complex of extremely low and ultra-low frequencies for geophysical research is known ”(RF patent No. 2188439, MKI G01V 3/12, 2002. This device consists of several identical generators operating on separate antennas, a single master oscillator and a receiving digital device.

The prototype of the proposed device is the VLF radio transmitter "GOLIAF-2MK". The radio transmitter consists of an exciter, a power amplifier and a control unit and is designed to transmit: control signals and messages from control points to mobile and stationary correspondents; signals of the state system of common time and reference frequencies "Purpose". The radio transmitter provides signal transmission in the modes of amplitude telegraphy (AT), frequency telegraphy (FT) and relative phase telegraphy (OPT) in the ultra-long-wave radio wave range with an output power of 1000 kW (flotprom.ru> Catalog ELEMENT_ID=83190 radio transmitter "GOLIAF - 2MK").

The disadvantage of both analog and prototype is that they are not able to timely unlock the radio transmitter with short start signals, which leads to the loss of part of the beginning of the information message.

The purpose of the utility model is to improve the quality of communication due to the timely unlocking of the radio transmitting device, which guarantees the transmission of an information message without loss.

This goal is achieved in that the device for automatically turning on the radio transmitter contains a microcontroller that is configured to generate a signal to turn it on when it enters the input of the radio transmitter (RPDU), characterized in that the microcontroller, which controls the functional units according to a given program, begins to measure the duration of positive and negative pulses, compares them with the constants stored in the memory of the microcontroller, while the number of comparison cycles is set from the control device to increase the accuracy of the pulse speed and, if the shape and frequency of the signals received at the input match, a signal is generated that is sent from the output of the microcontroller to the information display and a timer, as a result of which the timer will remove the locking signal, and the actuator, using an electromagnetic relay, the “dry” contacts of which are included in the RPDU unlocking circuit, unlocks it e, at the same time, the level converter with galvanic isolation transmits an information signal between electrical circuits, while the microcontroller is connected with its outputs to the information display and the timer, and the input of the microcontroller is connected to the control device and the level converter with galvanic isolation, and the level converter with galvanic isolation through the timer is connected to the actuator.

The device for automatically turning on the radio transmitter is shown in Fig. 1. It contains:

1 - microcontroller type AT89C52;

2 - information display;

3 - control device (keyboard);

4 - level converter with galvanic isolation;

5 - timer;

6 - executive device.

The device for automatically turning on the radio transmitting device (hereinafter referred to as UAVRPDU) is designed to automatically unlock the radio transmitting device (RPDU) when working in the radio link. The structure of the message flow is shown in Fig. 2.

Trigger signals are transmitted by bipolar square-wave pulses (meander) with an amplitude of ±20 V, the frequency of which can lie in the range from 15 to 25 Hz, which corresponds to a transmission rate of 30 to 50 baud.

The automatic switch on the radio transmitter analyzes both the shape and the frequency of the trigger signals. If the shape and frequency of the signals arriving at the input correspond to the specified parameters, the automatic switching device unlocks the RPDU.

In order to avoid locking the RPDU in pauses between messages in the stream (time T2 in Fig. 2), the UAVRPDU implements a delay when the executive circuit is turned off. If during the delay time no impulse has arrived at the input of the UAVRPD, then the RPDU will be locked.

The main technical characteristics of UAVRPdU.

The number of operating speeds of starting signals set from the control device (keyboard) is 3, which are simultaneously analyzed by the UAVRPDU - 3. The range of speeds of starting signals is 26÷160 Baud (13÷80 Hz).

The number of measuring cycles (checks) of the starting signal set from the control device (keyboard) is 3÷15.

Trigger analysis time at 26 baud:

- 0.26 s for 3 measuring cycles;

- 1.19 s at 15 measuring cycles.

Electrical parameters of the output signal:

- voltage of logic "1" plus 20÷27 V;

- voltage of logic "0" minus 20÷27 V;

- input impedance - 4.7 kOhm.

Tolerance for frequency and distortion of input signals 1÷20% (set by software).

The delay time for turning off the executive circuit is 1.3 s.

In FIG. 3 shows the time parameters of the UAVRPD operation.

The device works as follows.

From the moment the trigger signals arrive at the input of the UAVRPdU during the time T _an (Fig. 3), the device analyzes their speed and distortion. If they correspond to the set values, the RPDU is unlocked. If the pauses between messages do not exceed the turn-off delay time T _set =1.3 s, the RPDU does not lock. After the end of the messages, after a time of 1.3 s, the RPDU is locked.

The basis of the device is a microcontroller type AT89C52 1, which performs the necessary actions according to a given program. When a trigger signal is received at the input, the microcontroller begins to measure the durations of positive and negative pulses and compare them with the constants stored in the microcontroller's memory. The percentage tolerance for pulse duration can be programmatically changed from 1 to 20%. At the same time, the microcontroller compares with constants, by default, corresponding to 3 input signal rates equal to 36, 50 and 100 Baud.

The microcontroller generates a signal to turn on the RPDU if two conditions are met: the duration of positive and negative pulses correspond to the specified speed and are equal to each other within the specified tolerance. The number of comparison cycles can be set from the control device (keyboard) 3 in the range from 3 to 15. Increasing the number of comparison cycles increases the accuracy, but at the same time increases the time T _en (see Fig. 3). Each of the 3 operating speeds can also be set from the control device (keyboard) 3. At the moment the signal is given to turn on the RPDU, the microcontroller calculates the speed based on the pulse duration with an accuracy of 0.1 Baud and displays information on display 2.

The device also has the ability to measure the speed of an unknown signal at the input. When you press the "MEAS+" button, the speed is calculated by the duration of the positive pulses, when you press the "MEAS-" - negative ones. Thus, having determined the speed of an unknown trigger signal, you can enter this value in the number of one of the operating speeds.

The level converter with galvanic isolation 4 transmits an information signal between electrical circuits that do not have direct electrical contact between them in order to reduce interference, for contactless control and to protect equipment from damage and people from electric shock.

The signal to unlock the RPDU from the output of the microcontroller goes to timer 5, which, if not a single pulse has been received at the input for 1.3 s, then removes the unlocking signal and the actuator 6 locks the RPDU.

The front panel of the device displays the "Operation" LED, signaling the operation of the actuator 6, as well as the "Input" LED, indicating the presence of a signal at the input of the device.

As an actuator 6, an electromagnetic relay is used, the "dry" contacts of which are included in the RPDU unlocking circuit. The device is powered from an unstabilized DC source with voltages of 9 and 24 V and consumption currents of 0.2 and 0.02 A, respectively.

This device has been operated for 3 years on the SDV RPDU "Goliaf-2MK" and has proven to be reliable and easy to use. Thanks to its flexibility and great functionality, the efficiency of work and the quality of communication have increased. In particular, with short starting signals, the RPDU is unlocked in a timely manner, which ensures that the beginning of the information message is not lost. Thus, due to the timely start of the functioning of the radio transmitting device, the quality of communication is improved.

Claims (1)

A device for automatically turning on a radio transmitting device, containing a microcontroller that is configured to generate a signal to turn it on when it enters the input of a radio transmitting device (RPDU), characterized in that the microcontroller, which controls functional units according to a given program, begins to measure the duration of positive and negative pulses , compares them with the constants stored in the memory of the microcontroller, while the number of comparison cycles is set from the control device to increase the accuracy of the pulse speed and, if the shape and frequency of the signals received at the input match, a signal is generated that is sent from the output of the microcontroller to the information display and the timer, as a result which the timer will remove the locking signal, and the actuator, using an electromagnetic relay, the "dry" contacts of which are included in the RPDU unlocking circuit, unlocks it, while the level converter with galvanically isolated transmits an information signal between electrical circuits, while the microcontroller is connected with its outputs to the information display and the timer, and the input of the microcontroller is connected to the control device and the level converter with galvanic isolation, and the level converter with galvanic isolation through the timer is connected to the actuator.

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