RU24759U1 - MULTIFUNCTIONAL PROGRAMMABLE TELEMETRIC RADIO STATION - Google Patents

Description

MULTIFUNCTIONAL PROGRAMMABLE TELEMETRIC RADIO STATION

The utility model relates to techniques for transmitting digital information, voice signals and can be used in systems of radio telemetry, radio communications and information exchange between computers.

The prior art transceiver 1, in which the transmission and reception of information is carried out using fast Fourier transform, but the issue of improving the operational characteristics of the transceiver is not resolved.

The digital information transmission system 2 performs only one task: increasing the information flexibility of the system in the conditions of continuous information flow with limited information capacity of the receiving device.

Known transceiver 3 with the formation of phase-clock signals and solves the problem of transmitting only a speech signal.

Closest to the structural design is a telemetry controlled radio station 4, which provides a controlled mode of operation when transmitting digital information, but does not solve the problems that were posed to the authors.

The technical result, which is achieved by the claimed utility model, is to develop a radio station in which expanded functionality, improved operational characteristics, while maintaining maximum reliability. To achieve the specified result, a multifunctional programmable telemetric radio station contains sequentially

connected antenna, antenna switch, radio frequency amplifier, mixer, intermediate frequency amplifier and frequency detector, frequency synthesizer, one output of which is connected to the mixer, the second output is connected through a power amplifier to the antenna switch. The carrier frequency determiner, a control circuit, the first input of which is connected to the output of the frequency detector and the input of the carrier frequency determiner, the second input to the output of the carrier frequency determiner, the output to the interface card, and the interface card, consisting of a series-connected differential amplifier, are introduced into it adder and submodulator, mode switch, audio and digital signal amplifiers. The first output of the interface board is connected to the first input of the frequency synthesizer, the second output to the third input of the control circuit, the second input of the frequency synthesizer and the third input of the antenna switch. The control input signal is fed to the first input of the interface mode switch, and the input digital control signal is fed to its second input. The input speech signal goes to the second input of the adder of the interface board, and the input digital signal to the input of the differential amplifier of the interface board. The audio amplifier of the interface board has one output for a speech signal, and a second output for a digital signal.

The drawing shows a functional electrical diagram of the proposed radio station, where

1- antenna

2-antenna switch,

3- radio frequency amplifier,

4- mixer

5- intermediate frequency amplifier,

6-frequency detector

9 carrier frequency determinant,

10-amp power

11-interface board

12-differential amplifier

13-adder

14-submodulator

15-mode switch,

16 amplifiers of sound and digital signals,

17-input speech mode control,

18-input digital signal mode control,

19-input speech signal

20-input digital signal,

21-speech output,

22-output digital signal.

The input signal from the antenna 1 through the antenna switch 2 is fed to a radio frequency amplifier 3, a mixer 4, an intermediate frequency amplifier 5, a frequency detector 6, a control circuit 7, audio and digital signal amplifiers 16. The audio and digital signal amplifiers have a speech signal output and a digital output signal. From the output of the frequency detector 6, the signal is supplied to the determinant of the carrier frequency 9, from the output of which the control signal is supplied to the second input of the control circuit 7.

The speech signal at the input of the control mode of the speech signal 17, and the digital signal at the control input of the digital signal 18, are fed to the mode switch 15. The signal from the mode switch 15 is fed to the third input of the control circuit 7, to the second input of the frequency synthesizer 8 and to the third input of the antenna switch 2. A frequency synthesizer 8 generates a heterodyne frequency signal, which is fed to the second input of the mixer 4, and a carrier frequency signal, which is fed to a power amplifier 10, from the output of which goes to the second input of the antenna switch RA 2. The input speech signal at the input of the speech signal 19, and the input digital signal at the input of the digital signal 20 through the differential amplifier 12 are respectively supplied to the second and first inputs of the adder 13, from the output of which through the submodulator 14 are fed to the first input of the frequency synthesizer 8 with the aim carrier frequency modulation.

The radio works as follows:

In the “receive” mode, the signal received by the antenna is fed to the input of the radio frequency amplifier, which with the help of band-pass filters amplifies the signal and suppresses the mirror channels. From the output of the radio frequency amplifier, the signal goes to the mixer. The mixer is made according to the key scheme with the ability to control the value of sequential feedback and with a filter of the main selection of the type ФП2ПЧ-502-21,4. The use of a resonant input amplifier in the local oscillator circuit on the mixer circuit board and the output resonant circuit on the frequency synthesizer circuit pack allowed to reject the bandpass filter in local oscillator chains. The signal of the first intermediate frequency is amplified in the intermediate frequency amplifier, converted into a signal of the second intermediate frequency, limited, detected and fed to the interface board, where it is amplified in the audio frequency amplifier and fed to the handset, as well as to external telemechanics systems.

In the mode “transmission, the low-frequency sound signal from the input of the speech signal and the low-frequency signal from the PC or the telemechanics system from the input of the digital signal are sent to the interface board. On the interface board, the digital signal is amplified and fed to the adder, from the output of which through the submodulator it goes to the frequency synthesizer for frequency modulation of the carrier frequency. The frequency response of the submodulator is formed with a slope of 6 dB per octave. From the output of the frequency synthesizer, the signal goes to the pre-amplifier of the power amplifier, assembled on the transistor KT939A, providing

the required input power is 150-200 mW for the high-frequency microcircuit 57719-01, where the main power amplification takes place. The power amplifier provides an output power of 8-10 watts at an RH of 50 ohms. From the power amplifier, the transmitted signal enters through the antenna switch, made on pin - diodes, into the antenna.

A feature of the proposed radio station is the presence of an interface board, the model of which can be changed depending on the task being solved.

If the radio station is used in telemechanics systems:

1.With an external modem, then

the modem is not installed on the interface board

2.Without modem, then

on the interface board are installed:

a) at a data transfer rate of up to 1200 bps, the V23 modem is made on the MX604DW chip. The modem communicates with the COM port of the PC through the RS232 interface through the transceiver on the MAX211EEW1 chip.

b) at data rates of up to 4800 bps, a modem with a non-standard communication protocol is installed, where at baud rates of 1200 bps and 2400 bps, the biphasic modulation method is used, and at 4800 bps the method of direct frequency modulation is used.

Isolation functionally on the interface board of the mode switch, the amplifier of the output signals of the adder, differential amplifier, submodulator made it possible to make one base station multifunctional, changing the type of interface board you can get the radio stations:

Simplex connected; simplex dual-frequency with frequency reversal. Sources of information: 1. RF application for invention No. 93000020, IPC 6 Н 04 В 1/38, 6 Н 04 В 7/00. 2. RF application for invention No. 93002778, IPC 6 G 08 C 15/00. 3. RF application for invention No. 93036142, IPC 6 N 04 L 7/04. 4. RF certificate for useful) model JVb 1728, IPC 7 G 01 S 7/00, 7 N 04 V 7/00. (/4

Claims (1)

A multifunctional programmable telemetric radio station containing a series-connected antenna, antenna switch, radio frequency amplifier, mixer, intermediate-frequency amplifier and frequency detector, frequency synthesizer, one output of which is connected to the mixer, the second output is connected through a power amplifier to the antenna switch, characterized in that carrier frequency determiner, a control circuit, the first input of which is connected to the output of the frequency detector and the input of the carrier frequency determiner, the second input is with the output of the carrier frequency determiner, the output is with the interface board, and the interface board, consisting of series-connected differential amplifier, adder and submodulator, mode switch, audio and digital signal amplifiers, the first output of the interface board is connected to the first input of the frequency synthesizer, second output - with the third input of the control circuit, the second input of the frequency synthesizer and the third input of the antenna switch, the input speech control signal is supplied to the first input of the mode switch interface board, and the input digital control signal to its second input, the input speech signal goes to the second input of the adder interface board, and the input digital signal to the input of the differential amplifier of the interface board, the audio and digital signal amplifiers of the interface board have one output for the speech signal , second output for digital signal.