RU215322U1 - 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 of the radio transmitting device, which ensures that the beginning of the information message is not "eaten up". This result is achieved due to the fact that the microcontroller is configured to generate a signal to turn it on when a start signal is received at the input and control the functional units of the device, when the speeds calculated from the duration and positive and negative pulses correspond to the specified speed and are equal to each other within the set tolerance when comparing them with the constants stored in the memory of the microcontroller, 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 keyboard and the level converter with galvanic isolation, and the level converter with galvanic isolation through the timer is connected to the actuator. 3 ill.

Description

The utility model relates to electrical and radio engineering, namely to systems of 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 The radio transmitter consists of an exciter, a power amplifier and a control unit.

The object of application of the claimed 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 uniform 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 analogs and the prototype is that they do not have the ability for short start signals to unlock the radio transmitter in a timely manner, which does not guarantee the absence of "eating" 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 ensures that the beginning of the information message is not “eaten up”.

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 a start signal is received at the input and control the functional units of the device when the speeds calculated from the duration and positive and negative pulses correspond to the specified speed and are equal to each other within the established tolerance when comparing them with the constants stored in the memory of the microcontroller, 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 keyboard and the level converter with galvanic isolation, and the level converter with galvanic isolation through the timer connected to the actuator.

The functional diagram of the device is shown in Fig. one.

It contains:

1 - microcontroller type AT89C52;

2 - information display;

3 - 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 UAVRPU) is designed to automatically unlock the RPDU when working, for example, in the "Range" radio link. The structure of the message flow is shown in Fig. 2.

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.

Device and operation of UAVRPDU.

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

From the moment the trigger signals arrive at the input of the UAVRPdU, the device analyzes their speed and distortions for a period of time _Tan . 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 functional diagram of the device is shown in Fig. 1. The basis of the device is a microcontroller type АТ89С52 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 both 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) 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. 2). Each of the 3 working speeds can also be set from the control device (keyboard). At the moment the signal is given to turn on the RPDU, the microcontroller calculates the speed from the pulse duration with an accuracy of 0.1 Baud and displays the 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, removes the unlocking signal, and the actuator 6 locks the RPDU.

On the front panel of the device there is an "Operation" LED, signaling the actuation of the actuator, as well as an "Input" LED, indicating the presence of a signal at the input of the device.

As an actuating device, 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 at the Goliath-2MK RPD 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 “eaten up”. Thus, due to the timely unlocking of the radio transmitter, the absence of “eating” the beginning of the information message is guaranteed and the quality of communication is improved.

Claims (1)

A device for automatically turning on a radio transmitter, containing a microcontroller that is configured to generate a signal to turn it on when a trigger signal is received at the input and control the functional units of the device when the speeds calculated from the duration and positive and negative pulses correspond to the specified speed and are equal to each other within of the set tolerance when comparing them with the constants stored in the memory of the microcontroller, 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 keyboard 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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