RU11423U1 - TRANSCEIVER - Google Patents

Abstract

A transceiver containing a transceiver antenna connected to the input of the first (antenna) switch, the output of which is connected to a series-connected circuit from the receive path, demodulator, telephone, the second input of the receive path is connected to the first output of the frequency synthesizer, the second output of which is connected to the first input of the power amplifier the output of which is connected to the third input of the first switch, the second input of the power amplifier is connected to the second output of the control signal block, the first output of which is connected to the second input of the first switch, and the third output with the second input of the frequency synthesizer, the first, second, third inputs of the control signal block are connected to the first, second, third outputs of the tangent, the second output of the demodulator is connected to the fourth input of the control signal block, and also containing a microphone, characterized in that a noise generator and a second commutator are connected in series, a start-up circuit, a clock pulse generator, a pulse counter, a receive-transmit command shaper are introduced, trans the second key, the output of which is connected to the first input of the control signal block, the coincidence circuit, the command generator "Continue searching", the second key, the output of which is connected to the third input of the control signal block, the first input of the second switch connected to the microphone output, and the output - to the first input of the frequency synthesizer, the first output of the coincidence circuit is connected to the second input of the clock generator, the second output of the coincidence circuit is connected to the third input of the shaper of the command "Reception - P

Description

Transceiver.

The proposed utility model otnostkhz to the field of radio engineering and can be used to suppress radio lines with interference, aiming in frequency and time.

The creation of special reconnaissance and suppression devices for such radio links in the new frequency ranges is associated with high costs. The proposed utility model allows for the creation of such devices with low cost on the basis of similar radio stations.

As a prototype device, you can choose the FT2500M radio station from YAESU, 2t FM transceiver BT-2500M. Operating Manual, an enlarged functional diagram of which, made in accordance with a circuit diagram, is shown in FIG. 1.

1 - transceiver antenna;

2- antenna switch;

3-receiving path;

4- power amplifier;

5- frequency synthesizer;

6- control unit unit;

8- demodulator;

In the prototype device, the transceiver antenna 1 is connected to the PFV input of the antenna switch 2, the output of which is connected to the serial circuit from the receive path 3, demodulator 8 and telephone 9, the second input of the receive path 3 is connected to the output of the frequency synthesizer 5, the second output of which is connected to the first input of the power amplifier 4, the first input of the frequency synthesizer 5 is connected to the microphone 10, and the second input of the synthesizer is connected to the third output of the control signal block 6, the first and second outputs of which are connected respectively about with the second inputs of the antenna switch 2 and power amplifier 4, the output of which is connected to the third input of the antenna switch 2, and the first, second and third inputs of the control signal block 6 are connected to the corresponding outputs of the tangent 7, and the fourth input of the control signal block 6 is connected to the second demodulator input 8.

The operation of the prototype device u) occurs as follows. Switching between the Reception and Pfedacha modes is carried out by block 6 according to the signal from the output of 1 tanganga 7. Upon the output of 3 tangents 7, depending on the duration of pressing the corresponding button jHa, the tangent 7 generates either a transition command from one frequency recorded in the memory to another, or a scan command using the recorded frequencies. Scanning takes place before a signal is detected at any frequency. At the output of 2 tangents 7, the scanning step is set.

In the Transfer mode, the sound signal from the microphone 10 modulates the high-frequency signal generated in the frequency synthesizer 5. The modulated signal after amplification in block 4 through the switch 2 enters the antenna 1 and is emitted. In the Receive mode, the input signal through the switch 2 enters the receive path 3, where it is filtered, amplified, and transferred to the intermediate frequency. In the demodulator 8, an audible signal is generated and a squelch response signal is generated, which controls the scanning process. The sound signal embedded in demodulator 8 is sent to telephone 9.

Block 6 generates the necessary ringing signals by commands from the tangent 7.

In the prototype device, the MS 3772M microcircuit is used as a demodulator. A sufficiently close domestic analogue of this microcircuit is the K174XA26 microcircuit, the detailed composition of which is presented in FIG. 2.

Designations:

1- mixer;

2- key device; 3-second ULF;

5-gett) one;

6- amplifier-limiter of intermediate frequency signals;

7- frequency-phase detector.

The microcircuit has the functions of frequency conversion, amplification and limitation of the FM signal at the intermediate frequency, demodulation and preliminary amplification of the low-frequency signal, has elements of a silent tuning system. From the output of the frequency-phase detector 7, the projected signal is fed to the first VLF 4, from the output of which it is fed to the telephone path and to the input of the second VLF 3.

The signal from the second output of the first VLF is the control signal in the AFC system of the local oscillator. The second ULF is used as a signal amplifier in a silent tuning system. The amplitude-frequency characteristic of this amplifier is formed in such a way that it amplifies the noise in the kHz band (i.e., outside the signal bandwidth).

In the absence of an RF wave at the input of the microcircuit, at the output of the first VLF, significant high-frequency noises are observed, which are amplified by the second VLF, detected by an external detector, and fed to an external comparator.

If this noise voltage is greater than the threshold of the BSH system, then the voltage at the output of the key device 2 is absent, and the output low-frequency signal is shunted. If a useful signal appears on the input of the microcircuit (double-channel, then the high-frequency noise at the output of the first VLF is significantly reduced due to suppression by a useful signal. As a result, the voltage niym becomes less than the threshold of the BSN and the key device 2 is switched over. The low-frequency output ceases to be punted, and the output the key device appears harder to indicate fabatyvaniya system BSHN and the appearance of the field "mogul.

In a prototype device, quick control of reception modes. Reception - Transmission when the signal frequency changes in manual mode is difficult. To expand the functionality by providing automatic tracking of a signal with a jumping operating frequency and setting up interference, aiming in frequency and time, a block of external automatic generation of the Receive - Transmit and Continue Search commands is proposed.

For this, a prototype device containing a transceiver antenna, a series-connected antenna switch, a receive path, a demodulator, a telephone, and a microphone, includes: a second switch, a noise generator, first and second keys, a start circuit, a pulse counter, a match circuit, shapers commands Receive - Pfedacha and Continuation of the search, and the first input of the frequency adhesive is connected to the output of the second commute. torus, the first input of the switch is connected to the handset, and its second input is connected to the output of the noise generator, in addition, output 2 of the demodulator is connected to input 4 of the control signal block, output 2, which is connected to input 2 of the power amplifier. The output of the power amplifier is connected to the third input of the antenna switch, the second input of which is connected to the first output of the control signal block, the third output of the control signal block is connected to the input 2 of the frequency synthesizer, output 1 of which is connected to the second input of the receive path, and output 2 to the first input power amplifier, the inputs of the control signal block are connected to the tangent outputs, the first input of the control signal block is connected via the PFV key to the first output of the Receive-Transmit command shaper, the third block input is of the control signals is connected through the second key to the output of the command shaper. Continuation of the search, the second input of the pulse counter and the fourth input of the shaper. Commanders Reception - Transmission, the first input of which is connected; inen with the first output of the pulse counter and the third input of the match circuit, the first input of the shaper. Continuation the search is connected to the first output of the coincidence circuit and to the second input of the clock generator, the second output of the shaper of the command Reception - Transmission is connected to the second input of the coincidence circuit and the second input of the shaper - with the second output of the pulse counter, the third output of which is connected to the second input of the shaper of the command Continuation of the search, and the first input of the pulse counter through the clock generator is connected to the output of the circuit

start, the second output of the coincidence circuit is connected to the third input of the shaper of the command Reception - Transmission.

Functional diagram of the proposed device is shown in FIG. 3.

Designations:

1-10 are the same as in FIG. 1,

11- noise generator;

12- shaper of the command Receive - Transfer;

13- pulse counter; 14, 142-keys;

15 - clock pulse generator; 16-circuit startup;

17- shaper team Continuation of the search;

18 - match pattern;

19- second switch.

eyg / i / a (jo / i

The keys 14, 142 and the switch 19 are controlled by the operator. The operation of the proposed device is as follows. In the operating mode of the prototype radio station, the keys 14 and 142 are open, and the switch 19 connects the microphone 10 to the input 1 of the frequency synthesizer 5.

In the mode of Listening to a signal with frequency hopping, the keys 14 and 14 are closed, and the clock generator 15 is locked by the start circuit 16.

If there is a signal from the output 2 of the demodulator 8, which is the output signal of the noise canceling receiver, the radio is in reception mode. If this signal disappears, the former 17 will continue the Search Continuation command, by which the radio station enters the scanning mode according to the frequencies recorded in the memory. When a signal is detected at any frequency, the signal appears again from the output of the squelch and the radio station again enters the reception mode. In view of the relatively short time of frequency tuning, listening to signals with slow tuning of the operating frequency is performed with fairly good quality.

the clock generator 15 is started, and the reconnaissance and suppression cycles are set by the counter 13. According to the output signals of the noise suppressor, which is part of the demodulator 8, and the counter 13, the shapers 12 and 17 process the commands respectively Reception - Transmission and Continuation of the search. If there is a signal from the squelch output at the Receive command, the Transmit (Suppression) command is worked out and the radio station switches to the noise emission mode. After the suppression command is completed, the reconnaissance (reception) command is formed again, and if there is a signal from the squelch output, a suppression command is formed again, etc. The maximum number of N cycles of reconnaissance suppression at one frequency is set by the counter structure. When this number is reached, regardless of the presence of a signal from the output of the squelch, a command Continues to search and the radio station leaves this frequency. In addition, the departure from the frequency occurs when the signal disappears from the output of the squelch. Voltage plots at some points in the circuit of FIG. 3 are shown in FIG. 4. Plots a), b), c) and d) relate to the case when the signal is present at one frequency for more than the time Tpih, which corresponds to the maximum number of N cycles Exploration - Suppression. Plots a), b), c) and d) correspond to the case when the signal at a given frequency disappears and appears at the second. Duration of one cycle Exploration (Reception) - Suppression (Transmission) depends on the parameters of the clock generator 15 and internal connections in the pulse counter circuit.

The clock generator 15 together with the start circuit 16 can be performed according to the circuit shown in FIG. 5.

The operation of this circuit requires no explanation, except that the control signal at input 1 stops the generator during reception until the signal from the squelch appears. By changing the period of the clock pulses, the duration of the Intelligence mode can be changed.

The pulse counter 13 can be assembled according to the circuit shown in FIG. 6.

Divisors Ml, M2, MZ specify the ratio between the times of reception and transmission, and the divisor by N determines the maximum number of cycles Receive Transmission on one frequency. Using a decoder, a pulse is formed

termination of the search (Fig. 4). At the output 3, an impulse is allocated for the formation of the launch in the search.

Shaper Komatsi Reception - Transmission 12 can be performed according to the scheme in FIG. 7.

When a signal arrives at the S-input, the RS-trter generates a Transmission command until the signal arrives from the counter at input R. The signal fed to input 2 serves to generate a pulse for search reduction. Input 4 receives the pulse of the unit in the search, which transmits the radio receiver to the receive mode, regardless of the state of the RS trigger.

Command former Continuing searches 17 may be performed according to the circuit shown in FIG. eight.

The signal Continuation of the search at the output of the shaper is formed either after the end of N cycles Exploration - Suppression (by command at input 2), or when a signal is received from the output of the noise suppressor at input 1.

Matching pattern 18 can be duplicated as shown in FIG. nine.

Patent holder - Voronezh Research Institute of Communications.

Deputy Chief Engineer 4 Kalinin A.V.

Claims (1)

A transceiver comprising a transceiver antenna connected to the input of the first (antenna) switch, the output of which is connected to a series-connected circuit from the receive path, demodulator, telephone, the second input of the receive path is connected to the first output of the frequency synthesizer, the second output of which is connected to the first input of the power amplifier the output of which is connected to the third input of the first switch, the second input of the power amplifier is connected to the second output of the control signal block, the first output of which is connected to the second input of the first switch, and the third output with the second input of the frequency synthesizer, the first, second, third inputs of the control signal block are connected to the first, second, third outputs of the tangent, the second output of the demodulator is connected to the fourth input of the control signal block, and also containing a microphone, characterized in that a noise generator and a second commutator are connected in series, a start-up circuit, a clock pulse generator, a pulse counter, a receive-transmit command shaper are introduced, trans the second key, the output of which is connected to the first input of the control signal block, the coincidence circuit, the command generator "Continue searching", the second key, the output of which is connected to the third input of the control signal block, the first input of the second switch connected to the microphone output, and the output - to the first input of the frequency synthesizer, the first output of the coincidence circuit is connected to the second input of the clock generator, the second output of the coincidence circuit is connected to the third input of the shaper of the command "Reception - P transmission ", the second output of which is connected to the second input of the coincidence circuit, the first input of which is connected to the second output of the demodulator, and the third input of the coincidence circuit is connected to the first output of the pulse counter, the second output of which is connected to the second input of the transmitter" Reception - Transmission ", third the output of the pulse counter is connected to the second input of the shaper of the command "Continue the search", the output of which is connected to the second input of the pulse counter and the fourth input of the shaper of the command "Receive - Transmission"