KR910007564Y1 - Tranceiver having efficient modes transfer switches - Google Patents

Abstract

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Description

Simple Transceiver

1 is a conventional circuit diagram.

2 is a block diagram according to the present invention.

3 is a detailed circuit diagram of FIG. 1 according to the present invention.

4 is an exemplary switching installation example selection according to the present invention.

The present invention relates to a selection switch mode switching in a transceiver, and in particular, a transceiver capable of a simple selection operation capable of performing all functions quickly and easily by simplifying the user's key operation by reducing the number of operation switches. It is about.

The transceiver is a combination of a transmitter and a receiver.

It's small and can only be held in the hands of a person who can communicate with him. This is called a portable transceiver, or "Walkie Talkie." However, the radio wave is transmitted and received under the strict regulations of the Radio Control Law, and it is allowed by the President as three kinds of radio waves that can be launched without permission.

The first circuit of the transceiver which can communicate with the first degree within 200m is the circuit whose field strength is 15mW / m or less at a distance of 100m from the radio equipment of the radio station authorized by Presidential Decree.

Referring to the operation of the conventional mode by the selection mode in detail, the transmission and reception switching switch (S1-S4) is three circuits of three contacts, the power switch (SW1) is composed of a slide type switch and the call switch (SW2) It is a pushbutton switch. Therefore, the user can sequentially transmit and receive voices with the other party by switching between three modes.

When the power switch (SW1) is on, power is supplied from the battery power source (Bt) to the transceiver and is ready for operation.

Since the other party must first be called, the transmission / reception switching switching (S1-S4) is switched to the transmission mode (T) in order to send the call signal. At this time, the transmission and reception switch (S1-S4) is not operated separately, it turns out that the switch is interlocked. At this time, of course, the transmission and reception switch (S1-S4) is switched to the transmission mode (T), the call (SW) switch (SW2) is a call signal is output only when the push switch is pressed. The call signal is a call signal corresponding to a "beep" generated by the coils of the transistors TR2-TR3, capacitors C9-C14, and transformer T1. The resistors R13, capacitors C13, and call switches It is transmitted to the antenna ANT through SW2, and the call state is terminated when the user releases it. At this time, the other user hears the call signal through the transceiver in the reception mode.

At the time of transmission, the user's voice is input through a speaker / microphone (SP / Mic) which is a combination of a microphone and a speaker. The amplified signal is applied to the base of the transistor TR3 through the mode terminal T, and the amplified signal is induced on the secondary side of the transformer T2 and applied to the emitter of the transistor TR1 through the resistor R3. . In this case, since the transmission / reception switching switches S1 and S2 are connected to the transmission mode terminal T, the high frequency signal generated by the oscillator X-TAL and the amplified voice signal are modulated into AM by the transformer T3 and the antenna ( ANT).

The high frequency component induced by the antenna ANT is demodulated by the transistor TR1 and the transformer T3 as a voice signal, and the volume is controlled by the variable resistor VR5 through the transmission / reception switching switch S3 to control the transistors TR2-TR3, After amplified to an audio signal from TR5-TR6), voice is heard through the speaker / microphone (SP / Mic).

However, when actually going to play or use for entertainment, it should be convenient, on the contrary, it is not easy for beginners to learn because of the complicated operation of three switches, and there was a problem of cost increase in production.

Therefore, an object of the present invention is to provide a transceiver that can simplify the switching output operation.

Another object of the present invention is to provide a circuit that can be automatically called by the transmission selection of the transmission and reception mode switch in the standby (Stand-by) mode.

Another object of the present invention is to provide a circuit which can easily check the mode according to the function selection through the display device.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram according to the present invention, which has a transmission / reception switching switching unit (T / R) for switching a transmission / reception mode of a signal as it is pressed and released, and a power on / off for switching a power supply / off and a standby mode by selection. And a standby switching switching (P / S), and all common mode stages (CO1-CO3, CO1'-CO3 ') and transmission mode selection stages (T1-) according to the switch presses of the transmission / reception switching switching unit (T / R). T3, T1'-T3 ') are connected.

Accordingly, the output terminal 801 of the filter unit 88 is connected to the antenna ANT through the connected T2 'and CO2', and the speaker / microphone terminal SP / M is connected to the capacitor (SP / M) by connecting the T2 and CO2 terminals. C125) is connected to the input terminal 591 of the audio amplifier 58, and the oscillation signal of the internal oscillator of the high frequency oscillator 78 connects the connected T1 'and CO1' by the T1 'and CO1' stages. It is configured to provide the transmission AM modulated carrier oscillation signal to the input terminal 782 of the high frequency oscillator 78, and to connect the T3 and CO3 stages, and to turn on / off the standby switching unit (P / S). The noise generated from the output line 592 of the output transformer TF2 by the connection between the selection stage ST and the common mode selection terminal COM1 is input to the audio amplifier 58 through the capacitor D125. It is configured to provide as a signal according to the call.

When you release your hand from the transmit / receive switching switch (T / R), you are separated from the transmit mode selector (T1-T3, T1'-T3 ') and receive with the common mode selector (CO1-CO3, CO1'-CO3'). The mode selection stages RE1-ER3 and RE1'-RE3 'are connected.

As the CO2 'and RE2' terminals are connected, the antenna ANT is connected to the input terminal 181 of the demodulator 18. In addition, the CO2 stage and the RE2 stage are connected to connect the speaker / microphone stage SP / M to output the output signal of the output transformer TF2 through the audio amplifier 18 through the line 592 to the speaker / microphone stage SP. / M) is configured to output. The CO1 'stage and RE1' are connected to shorten the 11 and 12 nodes of FIG. 3, which will be described later, of the internal oscillator X-TAL of the high frequency oscillator 78 by the above connection, so that oscillation is stopped upon reception.

By connecting the CO1 stage to the RE1, the demodulator 18 and the first amplifier 28 provide the driving power of the line 2 as the driving power upon reception.

Therefore, T2, CO2 and RE2 of the transmission and reception switching unit (T / R) selects an operation function between the audio amplifier 58 and the speaker / microphone (SP / M) for use of the speaker and the microphone according to the transmission and reception of the switching. , T2 ', CO2', RE2 'is to be connected to the input and output terminals (801,181) of the filter unit 88 and the demodulator 18 for transmitting and receiving signals from the antenna (ANT), T1, CO1, RE1 supplies power to the demodulator 18 and the first amplifier 28 by the connection of CO1 and RE1 at the reception, and T1 and CO1 are connected at the time of transmission, so that the power supply to the receiver is cut off.

T1 ', CO1', and RE1 'are provided to provide the X-TAL oscillation signal of the high frequency oscillation unit 78 as a modulation frequency, and are provided as an internal oscillation signal during transmission and to block the supply of the oscillation signal upon reception.

The power on / off standby switching switch (P / S) is a sliding switch, and the power on (ON1, ON2) position and the standby mode selection stage (ST1, ST2) based on the common mode selection stage (COM1, COM2). have. When the power is off (OFF1, OFF2), all the transceiver's functions are off.

When the standby mode selection stages ST1 and ST2 are positioned, the common mode selection stages COM! And COM2 and the standby assortment selection stages ST1 and ST2 are connected to each other so that the power source of the battery BA is connected to the diode (BA). The driving power is supplied to the audio amplifier 58, the function selection display 48, the volume adjuster 38, and the transmission / reception switching switch T / R through D103.

The output terminal 592 of the audio amplifier 58 is connected to the common mode selection stage COM1 and the standby mode selection stage ST1 of the power on / off standby switching switching unit P / S so that the node 101 is connected. ).

Here, since the power source of the battery BA is supplied to the selectable display unit 48 through the standby mode selection stage ST2, the oscillation circuit is driven internally so that the flickering state can be seen through the display device. If the transmission / reception switching unit (T / R) is pressed at this time, the common mode selection terminal (CO1-CO3, CO1'-CO3 ') and the transmission mode terminal (T1-T3, T1'-) of the transmission / reception switching switching unit (T / R). T3 ') is connected internally and noise generated from the line of the output terminal 592 of the transformer TF2 of the audio amplifier 58 by the connection of the transmission mode terminal T3 and the common mode selection terminal CO3. The signal is applied to the input terminal 591 of the audio amplifier 58 through the capacitor C125, to the transmission mode terminal T2, to the common mode selection terminal 591, and to the transmission mode terminal T2. It is applied and output to the speaker / microphone (SP / M) through the common mode selection stage (CO2), the call noise signal is amplified by the audio amplifier 58, the high-order plate oscillator 70 in the modulator 68 AM modulated high frequency oscillated by carrier and output by the filter unit 88 at a predetermined band output frequency and connected through T2 'and CO2'. Call the other party by sending it to ANT.

That is, at this time, the other party is called by using the noise generated in the line 592 as a call signal without a transmission message.

When the user presses the hand pressed in the transmission / reception switching unit (T / R) from the switch in the stand-by position and enters the reception mode, the common mode selection stage of the transmission / reception switching unit (T / R) (CO1-CO3, CO1) is released. '-CO3') and the reception mode stages RE1-RE3 and RE1'-RE3 'are connected to each other to receive the call and message to the demodulator 18 and the first amplifier 28 by the connection of the CO1 and RE1 stages. The driving power according to the present invention, and connects the antenna ANT and the demodulator 18 by connecting the CO2 'and RE2' terminals to the demodulator 18 for the call signals and messages received from the antenna ANT. Allow input.

The oscillation of the internal oscillator of the high frequency oscillator 78 is stopped by the connection of the CO1 'and RE1' stages, and the incoming call and message signals are demodulated by the demodulator 18 by the connection of the RE2 and CO2 stages. The signal amplified by the amplifier 28 and appropriately adjusted by the volume controller 38 is amplified by the audio amplifier 58.

The signal amplified by the audio amplifier 58 is received by the speaker of the speaker and the microphone (SP / M) through the CO2, RE2 stage connected through the output transformer (TF2).

In the standby mode, since the standby mode selection stage ST2 and the common mode selection stage COM2 of the power on / off standby switching switch P / S are connected to each other, the battery power source BA is a function selection display unit. It is supplied to 48 to drive the internal multivibrator, so that oscillation causes the light emitting diode to flash.

If the power on / off standby switching switch P / S is at the power on stage (ON1, ON2), the power on / off standby by the internal contact of the power on / off standby switching switch (P / S) The power supply of the battery BA through the common mode selection stage CM2 is supplied to the function selection display unit 48 through the connection between the ON2) and the common mode selection stages COM1 and COM2 through the power supply ON stage. .

Accordingly, the power selection is displayed on the function selection display unit 48 so as to inform the state, and the driving power is supplied to the audio amplifier 58 and the transmission / reception switching unit T / R through the diode D102. have.

That is, in the power supply (ON1, ON2) mode, the common mode selection stages COM1 and COM2 and the standby selection stages ST1 and ST2 of the power on / off standby switching switching unit P / S are separated. Since the output terminal 592 and the line 101 of the output transformer TF2 are separated and no signal is transmitted even when the T3 and CO3 terminals are connected in the transmission mode of the transmission / reception switching unit T / R, the signal is transmitted from the call mode. It can be seen that it is released.

The power supply of the power on / off and standby switching switching unit (T / R) is a transmission mode, that is, when the transmission and reception switching switching (T / R) in the mode (ON1, ON2), the transmission mode stage (T1-T3, T1 ' -T3 ') and the common mode selection stages (CO1-CO3, CO1'-CO3') are connected, so that T2, It is input to the audio amplifier 58 through the capacitor (C125) through the CO2 stage. The signal amplified by the audio amplifier 58 is applied to the modulator 68 and generated in the internal oscillator of the high frequency oscillator 78 by the connection of the T1 'and CO1' stages of the transmission / reception switching switching unit T / R. The high frequency signal is input to the modulator 68 as a modulated oscillation carrier signal. The high frequency signal of the high frequency oscillator 78 is loaded on the message signal amplified by the audio amplifier 58 by the modulator 68, and then AM-modulated and input to the filter unit 88.

The filter unit 88 transmits the T2 'stage and the CO2' stage connected by filtering a predetermined band to the antenna ANT.

When the hands are released from the pressed state of the transmission / reception switching switching unit (T / R), it becomes a reception mode, and the common mode selection stage (CO1-CO3, CO1'-CO3 ') and the reception mode stage (RE1-RE3, RE1'). -RE3 ') is connected. The antenna ANT is connected to the demodulator 18 by the connection of the CO2 'and RE2' stages, and the speaker / microphone stage SP / M is used as the speaker by the connection of the CO2 stage and the RE2 stage.

When the CO1 stage and the RE1 are connected, the driving power of the demodulator 18 and the first amplifier 28 is supplied at the time of reception, and the oscillator is turned off internally by the CO1 'stage and the RE1' stage. Stop it.

Therefore, the signal received from the antenna ANT by the connection of the CO2 'and RE2' stage is demodulated by the demodulator 18, amplified by the first amplifier 28, and then received by the volume control unit 38. Volume is adjusted. The received signal whose volume is adjusted is input to the audio amplifier 58 through the capacitor C125.

After amplified by the audio amplifier 58, the amplified signal of the audio amplifier 58 is converted through the output transformer TF2 to a DC power source provided through the diode D102, and the transmission and reception switching level switching unit (T / R) ) Is received by the microphone / speaker (SP / M) through the CO2 and RE2 connections.

The functions according to the selection of the power on / off and standby switching switching unit P / S and transmission / reception switching switching unit T / R are as follows.

3 is a relief circuit diagram of FIG. 2 according to the present invention, in which R101-R125 is a resistor, C101-C125 is a capacitor, L101-L109 is a coil, Q1-Q7 is a transistor D101-D104 is a diode, and X-TAL is Crystal oscillator, LED is light emitting diode, BA is battery, T / R is transmit / receive switch, P / S is power on / off and standby mode switch. T1-T3 and T1'-T3 'of the transmission and reception switching unit T / R are transmission mode selection terminals, and RE1-RE3 and RE1'-RE3' are reception mode selection terminals, and CO1-CO3 and CO1'-. CO3 'is a common mode selection stage.

ON1-ON2 and OFF1-OFF2 of the power on / off and standby switching switching unit (P / S) are power on / off mode selection stages, ST1-ST2 is a standby mode selection stage, and COM1-COM2 is a common mode selection stage. to be.

The antenna ANT is connected to the common mode selection terminal CO2 'of the transmission / reception switching switching T / R, the coil L101 is connected to the reception mode selection terminal RE2', and the coil L101 is cranked. It is connected to the primary side coil (L102) of (TF1) and the capacitor (C106) is connected in parallel to the secondary coil (L103) of the transformer (TF1), and the capacitor (C107) is connected to the collector of the transistor (Q2), Combine resistor R108 and capacitor C108 in parallel to the base of transistor Q2, connect resistor R107 from the base of transistor Q2, and resistor R106 to the emitter of transistor Q2. ) And the capacitor C109 are connected in parallel to the ground, and the demodulation unit 18 is configured to ground by coupling the capacitor C105 from the middle tap of the secondary coil L103 of the transformer TF1. The resistors R101 and R102 are directly connected to the base of the transistor Q1 from the reception mode selection terminal RE1. The resistor R109 is connected from the transfer mode select terminal T1 to the collector of the transistor Q1, and the resistor 104, resistor R103 and capacitor C103 are connected to the emitter of the transistor Q1. Are coupled in series so that the resistors R104 and R103 are grounded to the first amplifier 28 and connect the capacitor CO14 and the variable resistor VR101 from the collector of the transistor Q1. The part is a volume control unit 38, and connects the resistor R10 from the node 2 to connect the cathode side of the diodes D102 and D103, and to the anode side of the diodes D102 and D103. Resistor R111, R112, R124, R125 and capacitor from the standby mode selection stage ST2 by connecting ON / OFF and standby mode selection stage ST2 of the on / off and standby switching switching unit P / S. A multivibrator consisting of (C111, C112) and transistors Q3, Q4 is constructed, and the The anode of diode D104 is connected to the meter so that the cathode is grounded, and the resistor R113 is coupled to the node 3 from the cathode side of the diode D101 to the emitter of the transistor Q4. And a part configured by connecting an anode of the light emitting diode (LED) to the node 3 is a function selection display unit 48, and from a node combining the transmission mode selection terminal T3 of the transmission / reception switching switching (T / R). The node is connected to the common mode selection terminal COM1 of the power supply and the standby switching switching unit P / S, and the reception mode selection terminal RE2 of the transmission / reception switching switching unit T / R is connected to the node 4 so that the node is connected. (4) is connected to the standby mode selection stage (ST1) of the transmission and reception switching switching unit (T / R) by connecting a resistor (R114), and the secondary coil (L104) of the transformer (TF2) from the node (4) The transmission mode selection terminal T2 and the common mode selection terminal CO3 of the transmission / reception switching switching unit T / R. It is connected to the summed node 5 and connected to the volume control unit 38 through a resistor R303. At the same time, the capacitor C125 is coupled to the base of the transistor Q5. The collector side of the transistor Q5 is connected. The resistor R116 is connected from the node 7 to one side of the primary coil L105 of the transformer TF2, and is connected to the base of the transistor Q6 from the node 7 and the transistor Q6. A resistor R118 and a capacitor C16 are directly connected between the base and the collector of the C, and connected to the node 18 so that the primary coil L105 of the transformer TF2 is connected to the other side and the Emmy of the transformer Q6 is connected. After the resistor R117 and the capacitor C115 are connected to each ground in the emitter, the portion configured to be connected to the base of the transistor Q5 through the resistor R119 is the audio amplifier 58, and the audio amplification is performed. Intermediate of the primary coil L108 of the transformer TF3 from the node 8 of the unit 58 Is a modulator 68 and a capacitor C120 from the coil L108 is connected to the nodes 9 and 10. Connected in parallel to the resistor R122 from the node 9 to the node 11 and the common mode of the oscillator (X-TAL) and the transmission / reception switching unit (T / R) from the node 11. The selection stage CO1 'is connected, and the reception mode selection stage RE1' of the transmission / reception switching switching unit T / R is connected from the node 12 to which the oscillator X-TAL is connected. A portion of the switching mode T / R connected to the transmission mode selection terminal T1 ′ to the base of the transistor Q7 and coupled to the collector of the transistor Q7 by the node 10 is a high frequency oscillator 78. And a filter composed of one choke coil and two bypass capacitors in the secondary coil L109 of the transformer TF3 and the coils L105 and L106. The filter unit comprises a part configured with two stages of the capacitors C122-C124 so that the output stage of the π-type filter composed of the two stages is connected to the transmission mode selection stage T2 'of the transmission / reception switching switching unit T / R. (88).

In the transmission and reception switching unit (T / R), T1, CO1, and RE1 switch on the power supply side, T1 ', CO1', and RE1 'switch on the crystal oscillation side, and T2, CO2, and RE2 are microphones and speakers. The side signals are switched, and T2 ', CO2', and RE2 'switch antenna side transmit and receive signals, and T3, CO3, and RE3 have a function of switching according to a call in the standby state.

4 is a perspective view of a transceiver according to an embodiment of the present invention, 300 is an external protrusion of the transmission / reception switching switch T / R of FIG. 2, and 400 is a power on / off and standby switching switch of FIG. S is the outwardly projecting part of S), 500 is a second-degree microphone and speaker (SP / M), and 600 is an antenna (ANT).

The transmission and reception switching unit (T / R) is a push button type switch can be transmitted when pressed, and can be received when away from the transmission and reception switching switch (T / R). The power on / off and standby switching switching unit (P / S) can be set by selecting a power on (on), off (off) and standby (ST) mode with a slide switch, the standby (ST) mode According to the transmission / reception mode switching unit (T / R), the transmission and reception mode can be automatically called mutually. That is, in the transmission mode of the transmission / reception switching unit T / R, the call signal is received in the reception mode.

Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4 above. When the other party is called, the power on / off and standby switching switch (P / S) of FIG. Put it in position. At this time, the common mode selection stage (COM1, COM2) and the standby mode selection stage (ST1, ST2) is connected to provide the battery (BA) power through the resistor (R110) to the line (2) through the diode (D103), The DC voltage is supplied to the node 8 as a driving power supply via the node R116 as the primary side of the node 7 and the transformer TF2.

Therefore, noise is generated in response to the application of DC power from the line 4 of the output transformer TF2, and the common mode selection stage COM1 and standby of the power on / off and standby switching switching unit P / S are generated. The noise signal is applied to the line 101 by the connection of the mode selection stage ST1.

In this state, when the switch is in the transmission mode by pressing the switch in the transmission / reception switching unit (T / R), the transmission mode selection stage (T1-T3, T1'-T3 ') and the common mode selection stage (CO1-CO3, CO1'-CO3' Since the generated noise signal is applied to the transistor Q5 through the node 5 and the capacitor C125 by the connection of T3 and CO3 and the connection of T2 and CO2, the speaker / microphone mode selection stage ( SP / M) and you can hear the beeping sound.

The signal applied to the base of the transistor Q5 is amplified and applied to the base of the transistor Q6. At the same time as the signal is amplified in the transistor Q6, the high frequency signal of the characteristic frequency band which is not necessary by the resistor R118 and the capacitor C16 is removed and output to the collector node 18 of the transistor Q6.

The noise signal for the output call is applied to the primary side tap of the transformer TF3 on the DC voltage of the node 8.

The high frequency oscillation signal of the crystal oscillator X-Tal is applied to the base of the transistor Q7 and amplified by the connection of the common mode selection stage CO1 'and the transmission mode selection stage T1' and then the transformer TF3. AM modulates a high frequency transmission signal on the call signal.

The modulated signal output from the transistor TF3 is filtered by a filter including coils L105 and L106 and capacitors C122 to C124, and transmit mode selection stage T2 'and common mode selection stage CO2'. It is sent to the antenna (ANT) through the passage by the connection of the call to the other party.

In the standby mode (ST), if you release the transmission and reception switching unit (T / R), the reception mode becomes the common mode selection stage (CO1-CO3, CO1'-CO3 ') and the reception mode selection stage (RE1-RE3). , RE1'-RE3 ') are connected. The power supply on the line 2 is connected to the common mode selection stage CO1 and the reception mode selection stage RE1 through the demodulator 18 and the first amplifier 28 through the resistors R101 and R102. Is applied as a driving power source, and a call signal through the antenna ANT is applied to the transformer TF1 through the coil L101 by the connection between the RE2 'end and the CO2' end.

In the transformer TF1, a signal of a desired frequency band is received by the LC resonant circuit by the capacitor C106 and the coil L103 and applied to the base of the transistor Q2. The signal applied to the base of the transistor Q2 is amplified and applied to the base of the transistor Q1 through the transformer TF1.

The signal amplified by the transistor Q1 is adjusted by the variable resistor VR101, and the volume of the received signal is amplified through the transistors Q5 and Q6 through the capacitor C125. The signal amplified by the transistor Q6 is output through the transformer TF2 through the connected CO2 stage and the RE2 stage to the speaker of the speaker and the microphone stage SP / M, indicating that there is a call from the other side.

In the standby state, the battery BA is supplied with power to the function selection display unit 48 to the resistors R124, R125, R11, and R112, the capacitors C112, C111, and the transistors Q3 and Q4. A predetermined pulse signal is generated by the multi-vibrator so that the light emitting diode LED is turned on / off and flashes.

The received message can also receive the other party's message via the same channel described above. That is, when the power on / off and standby switching switching unit (P / S) is in the standby mode (ST), the resistors (R111, R112) and capacitors (C111, C112) are driven by the multi-vibrator driven by the battery (BA) power source. It is oscillated by the time constant determined by and flashes the light emitting diode (LED) to notify the user by flashing the standby mode, and transmits the call signal of the other party according to the transmission operation of pressing the transmission / reception switching unit (T / R), The group may receive a call signal from the other party according to the receiving operation, while receiving a message.

In this state, however, the line 4 noise, which cannot transmit a message, is used as the call signal, so if the noise is included in the transmission message, the contents of the message cannot be heard upon reception.

Therefore, for the message transmission, the power on / off and standby switching switching unit P / S should be placed in the power on modes ON1 and ON2. The message may be transmitted and received according to an operation of pressing or releasing the transmission / reception switching switching (T / R) in the power-on mode (ON) position.

When placed in the power mode (ON) in the power on / off standby switching switching unit (P / S), the LED is placed through the diode (C101) when placed in the common mode selection stage (COM1) and the power-on mode selection stage (ON1, ON2). Turn on (LED) to indicate it is on.

The audio amplifier 58 is supplied to the audio amplifier 58 through the diode D102 and provided to each unit through the resistor R110. In the power-on mode (ON1, ON2), when the switch is pressed to set the transmission mode of the transmission / reception switching switching unit (T / R) for message transmission, the common mode selection stage (CO1-CO3, CO1'-CO3 ') and transmission mode Selective terminals (T1-T3, T1'-T3 ') are connected and connected to T2' and CO2 'terminals so that the antenna ANT can be sent to the other side, and the speaker / microphone is connected by T2 and CO2 terminals. (SP / M) and the input terminal of the audio amplifier 58 are connected to input the signal input through the microphone to the audio amplifier 58.

Even when the T3 and CO3 stages are connected, the ST1 and COM1 stages of the power supply on / off and standby switching switching unit (P / S) are open so that there is no influence of the line noise required during the call.

The high frequency signal generated from the crystal oscillator (X-TAL) is connected to the T1 'stage and the CO1' stage as a carrier signal for AM modulation. Therefore, when a message for transmission is input through the speaker / microphone stage SP / M, it is input to the base of the transistor Q5 through the capacitor C125. The signal input to the transistor Q5 is amplified and input to the base of the transistor Q6.

Here, the capacitors C117 and C115 are for high frequency noise bypass, the resistor R119 is for bias adjustment, and the resistor R117 is for output stabilization.

The signal input to the base of the transistor Q6 is amplified and input to the transformers TF2 and TF3, but the secondary side of the transformer TF2 is open to the reception mode selection terminal RE2, which is meaningless. The message signal carrying the DC power supplied from the battery BA, which is input to the primary side of the N, is AM-modulated by the high frequency signal provided from the transistor Q7 and input to the filter unit 88.

The π-type filter of the filter unit 88 is configured by the coils L105 and L106 and the capacitors C123 and C124. ANT) is sent out.

When the switch of the transmission / reception switching switching unit T / R is released in the power-on mode ON, the reception mode terminals RE1-RE3, RE1'-RE3 'and the common mode selection stage CO1-CO3, CO1'- CO3 ') is connected to enter the message receiving mode. The antenna ANT is connected to the input terminal of the demodulator 18 by connecting the RE2 'stage and the CO2' stage, and the speaker / microphone stage SP / M is output by the connection of the CO2 stage and the RE2 stage. ) So that the reception signal is outputted by connecting to the secondary coil of), and since T1 and CO1 are always connected, the driving power through the diode D103 passes through the resistor R110 by the connection between the CO1 terminal and the RE1 terminal. When the message is received through R101 and R102, the demodulator 18 and the first amplifier 28 are supplied to the driving power.

By connecting the RE1 'stage and the CO1' stage, both nodes 11 and 12 of the crystal oscillator (X-TAL) are shorted to stop the oscillation. Therefore, the message through the antenna ANT is applied to the base of the transistor Q2 beyond the transformer TF1 through the coil L101. The transformer TF1 receives a desired frequency band by LC resonance by the capacitor C106 and the coil and is applied to the base of the transistor Q2 through the capacitor C108.

Here, the resistors R103 and R108 are for bias adjustment, and the capacitor C107 is for adjusting oscillation intensity. Therefore, the intensity of resonance in the transformer TF1 is adjusted by the capacitor C107. The resistor R106 and the capacitor C109 are for stabilizing the output. The message reception signal through the transformer TF1 is applied to the base of the transistor Q1. The signal applied to the base of the transistor Q1 is amplified and the level of the input message signal is adjusted by the variable resistor VR101 through the capacitor C104.

The adjusted received message signal is applied to the base of the transistor Q5 through the capacitor C125 and amplified. The amplified signal is applied to the base of the transistor Q6 and amplified and then input to the transformers TF3 and TF2.

Since the oscillation is stopped by the connection between the RE1 'and CO1' stages while the T2 'stage and the CO2' stage are open, the AM modulation of the modulator 68 is meaningless, and the CO2 to which the signal input to the transformer TF2 is connected is connected. It is received by the speaker through the speaker / microphone stage (SP / M) through the stage and RE2 stage.

Therefore, when the power on / off and standby switching switching unit (P / S) is in the power on position (ON), the status is displayed by the light-emitting diode (LED) of the function selection display unit 48, and at the same time, the transmission and reception switching You can send and receive messages to and from the other party by manipulating the T / R.

As described above, all functions are possible by the two switches, and all the function selections are distinguished and displayed, so that the user can easily know the current state, and there is an advantage that the call can be made automatically by the standby function.

Claims (2)

Demodulator 18, first amplifier 28, volume adjuster 38, audio amplifier 58, high frequency oscillator 78, modulator 68, filter 88 and antenna ANT In the transceiver, the transmission mode selection stage (T1-T3, T1'-T3 ') for message and call signal transmission and the reception mode selection stage (RE1-RE3, RE1'-RE3') for receiving call and message The demodulation unit 18 is connected to the transmission mode selection terminal RE2 'of the transmission / reception switching switching unit T / R, and the filter unit 88 is connected to the reception mode selection terminal T2' in common. The antenna ANT is connected to receive and transmit a message and a call signal from the demodulation unit 18 and the filter unit 88 according to the switching based on the mode selection stage CO2 ', and the transmission mode selection stage ( T2) is connected to the input terminal 591 of the audio amplifier 58, and the output mode 592 of the audio amplifier 58 is connected to the reception mode selector RE2 to reference the common mode selector CO2. According to the switching A speaker / microphone terminal (SP / M) is connected to output a message from the input / output terminals 591 and 592 of the audio amplifier 58, and is common to the power on / off terminals ON1-ON2 and OFF1-OFF2. The audio amplifying unit includes a standby mode selecting stage ST1 of a power on / off and standby switching switching unit P / S having a mode selecting stage COM1-COM2 and a standby mode selecting stage ST1-ST2. The common mode selector COM1 to the transmission mode selector T3 of the transmission / reception switching switching unit T / R, and to switch the common mode selector CO2. According to the transmission mode selection stage T3, the line noise of the output terminal 592 of the audio amplifier 58 in the standby mode of the power on / off and standby switching switching unit (P / S) call signal The transmission mode selector T1 ′ of the transmission / reception switching switching unit T / R to the high-frequency audio amplifier 58. It is connected to the input terminal 782 of the oscillator 18, the reception mode selector (RE1 ') is connected to the high frequency oscillator (78), and transmits and receives a message and a call signal based on the common terminal (CO1') Accordingly, the high frequency oscillation signal is connected to the output terminal 781 of the high frequency transmitter 78 so as to be selectively provided as a modulation carrier signal, and the common mode selection terminal of the power on / off and standby switching switching unit P / S. The battery BA is connected to the COM2, and the diodes D102 and D103 are connected to the power ON stage and the standby mode selection stage ST2, and at the same time, the function selection display unit 48 is connected. The output terminals of the diodes D102 and D103 are connected to the transmission mode selection terminal T1 and the common mode selection terminal CO1 of the audio amplifier 58 and the transmission / reception switching switching unit T / R. Connected to the connected terminals, and connected via the receive mode selection terminal (RE1) Portion 18 and a first simple selection operations are possible transceiver of claim arranged to be driven by power amplifier 28. The power supply of the battery BA according to claim 1, wherein the function selection display unit 48 supplies power to the battery BA according to the selection of the standby mode selection terminal ST2 of the power on / off and standby switching switching unit P / S. The multivibrator receiving and oscillating, and the power on / off and standby switching switching (P / S) of the power is composed of a light emitting diode (LED) which is turned on at the (ON2) position and flashes by the output of the multivibrator. Features a simple selectable transceiver.