CN2272633Y - Double-frequency double-function center-free radio group telephone - Google Patents
Double-frequency double-function center-free radio group telephone Download PDFInfo
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- CN2272633Y CN2272633Y CN96241760U CN96241760U CN2272633Y CN 2272633 Y CN2272633 Y CN 2272633Y CN 96241760 U CN96241760 U CN 96241760U CN 96241760 U CN96241760 U CN 96241760U CN 2272633 Y CN2272633 Y CN 2272633Y
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Abstract
The utility model relates to a double-frequency double-function center-free radio group telephone, comprising a power component, a double-function device, a frequency switching component, a receiving component, an emission component, a monolithic computer, a keyboard and a display component. The double-function device is composed of an antenna, two components with f 1 filter frequency and two components with f 2 filter frequency. The frequency switching component comprises a calling switch SW2, a callback switch SW3, switching switches K1, K2, K3 and an inverter IC13. The switching switch K can switch the received frequency of the receiving component, and the switching switch K3 can also switch the emission frequency of the emission component. The utility model has the advantages that the expensive switching station and the exchange station can be left out, any single telephone can make a group call to other single telephones in a calling way in the radio group telephones without interference on each other.
Description
The utility model relates to the no center of double frequency duplex wireless group telephone.Belong to communication tool.
Popular in the market communication tool is the radio telephone (mobile telephone) of telephone, double frequency duplex and the intercom of single-frequency simplex.Preceding two kinds must have switching station or board, and the third then uses inconvenient operation.
The purpose of this utility model is to design and develop wireless group telephone, without stringing, save expensive group through-connection station and board, the mode of exhaling is grouied busy or individual calling (two-way intercommunication) to other units and in the radio communication mode the arbitrary unit of wireless group telephone all can be led, do not disturb mutually, maneuverability, easy to carry, easy and simple to handle.
The technical scheme that the wireless group telephone that the utility model is designed and developed achieves the above object is as follows:
The no center of double frequency duplex wireless group telephone comprises power supply unit, receiving-member, and emission element, single-chip microcomputer, keyboard and display unit is characterized in that, also are provided with duplexer.The second filtering unit SAW2 and the 4th filtering unit SAW4 that duplexer is f2 by antenna and two frequency filterings first filtering unit SAW1 that is f1 and the 3rd filtering unit SAW3, two frequency filterings form.One end of first, second filtering unit is connected with antenna, the other end of first filtering unit is connected with the K1-2 normally open contact with the K1-1 normally closed interlock of diverter switch K1, the other end of second filtering unit is connected with the K1-2 normally closed interlock with the K1-1 normally open contact of diverter switch K1, the change over contact of diverter switch K1-1 is connected with the 4th filtering unit with the 3rd filtering unit, and the change over contact of diverter switch K1-2 is connected with the terminal of emission element (19); The other end of the 3rd filtering unit is connected with the K2-1 normally closed interlock of diverter switch K2, and the other end of the 4th filtering unit is connected with the K2-1 normally open contact of diverter switch K2, and the change over contact of diverter switch K2-1 is connected with the terminal of receiving-member (11).
The frequency switching part comprises main exhale switch (SW2) and callback switch (SW3), diverter switch K1, K2, K3 and inverter ic 13.The master exhales the terminal 1 of the SW2-1 of switch (SW2) to connect 12,13 pin of diverter switch K1, K2, K3 and inverter ic 13; The main terminal 1 of the SW2-2 of switch (SW2) of exhaling is connected with cutter and the terminal 1 of SW3-2 and the terminal (20) of emission element of the SW3-1 of callback switch (SW3); The main cutter of the SW2-2 of switch (SW2) of exhaling is connected with the cutter of the SW3-2 of power supply E and callback switch; 1 of inverter ic 13,2 pin are connected with the terminal 1 of the SW3-1 of callback switch (SW3) by resistance R 68,3 pin of inverter ic 13 are connected with the pin 46,45 of single-chip microcomputer IC5 respectively with 11 pin, the pin 14 of inverter ic 13 is connected with 2 pin of IC10 with the main cutter of the SW2-1 of switch of exhaling, pin 7 ground connection of inverter ic 13, pin 1,2 is received between resistance R 68 and the R69.
The utility model is described in further detail by embodiment below in conjunction with accompanying drawing.
Fig. 1 is a front of the present utility model outline drawing;
Fig. 2 is a system works theory diagram of the present utility model;
Fig. 3 is duplexer of the present utility model, diverter switch and power unit line map;
Fig. 4 is a receiving-member electrical schematic diagram of the present utility model;
Fig. 5 is an emission element electrical schematic diagram of the present utility model;
Fig. 6 is single-chip microcomputer of the present utility model, keyboard and display unit electrical schematic diagram.
The utility model main feature: have the no center of (1) double frequency duplex (2) (3) wireless (4) and have 3 to 10 system of group.The also platform number of extendible group telephone as required.Its function has the number one lead aircraft to carry out the duplex conversation with all the other numbers machine simultaneously, also can carry out the duplex conversation respectively with each separate unit machine; Each number unit can carry out the duplex conversation in twos not to be disturbed mutually, is a kind of futuramic unique products that has.Its way circuit figure is made up of four major parts: (see figure 2)
(1) duplexer, frequency switching part and power unit;
(2) receiving-member;
(3) emission element;
(4) single-chip microcomputer, keyboard and display unit.
The groundwork principle of its circuit is as follows:
1, the circuit working principle of duplexer, frequency switching and power unit
These parts are the main unique distinctions of this machine, are that other types are not available." no " center " is mainly assigned to finish by our department.It mainly is made up of three parts such as duplexer, frequency switching part and power supplys.(please referring to Fig. 3)
(1) duplexer operation principle
1. when receive frequency be f1, when tranmitting frequency is f2, after received signal enters this machine from antenna (ANT) reception, through frequency diverter switch k1-1 (f1) end, L11, filter 3, L13 enters receiving-member input IC1 the 2nd pin (please referring to Fig. 4) through frequency diverter switch K2-1 (f1) end again by L6, L7, filter 1, L9.
Transmit and enter this part after frequency diverter switch K1-2 (f2) end, L10, filter 2, L8 and L6 arrive transmitting antenna to aerial emission from 19 ends (please referring to Fig. 5) of emission element.
2. when receive frequency be f2, when tranmitting frequency is f1, its circuit working principle is basic with 1. identical, but must switching frequency, turns to (f2) to hold simultaneously frequency diverter switch K1-1, K2-1; K1-2 then turns to (f1) end.Filter 1 to 4 can be used the KSD mode filter.
(2) frequency switching part operation principle
This machine is for realizing that " the double frequency duplex conversation between no " center " manys machines must be adopted unique frequency switching circuit, promptly must should have " main exhaling " machine function in this machine; Has " by exhaling " machine function again; " waiting for " function that also will have power saving work, so this machine adopted novel design circuit on circuit design, make this function possess this three kinds of operating states simultaneously: 1 " waiting for " state; 2 " main exhaling " state; 3 " callback " state.The most novel, the unique design part of this machine that Here it is.
For reaching this three kinds of operating states, must carry out frequency when the time comes and switch.The frequency switching part mainly is made up of K1-K3 diverter switch, " main exhaling " switch (SW2) and " main exhaling " indication LED 2 thereof and " callback " switch SW 3 and " callback " indication LED 3 thereof etc.Concrete operation principle is as follows:
1. " wait for " state
Circuit just is in " waiting for " state when SW2 disconnects, and K1-K3 all is failure to actuate, so the operating frequency of Shi Benji: receive frequency is f1, and tranmitting frequency is f2.For saves energy, when this state, radiating portion stops emission.Receiving unit then is interrupted the reception.(1/4T receives, and 3/4T stops).
2. " lead and exhale " state
When a certain machine need be called out in the group, then this number machine just must be connected the SW2 switch earlier, and (this moment, LED2 was bright), so the K1-K3 action becomes f2 with receive frequency immediately, tranmitting frequency becomes f1, so that perform the preparation with " callback " machine duplex signaling.Wherein K2-2 and K3-1 and K3-2 diverter switch are receiving and radiating portion (please referring to Fig. 4 and Fig. 5) respectively.
3. " callback " state
When a certain phone in the group was received " calling " signal, this number machine can send the ring sound immediately." by exhaling " machine must demand working " callback " switch (SW3) at this moment (this moment, LED3 was bright), the power connection of radiating portion.The reception and the tranmitting frequency of this number this moment machine do not change, the frequency when still keeping " waiting for " state.Just can wait for " main exhaling " machine and carry out the duplex conversation.
(3) power unit operation principle
This part by battery pack E (7.2V-8.4V), mains switch (SW1) and " power supply " indication (LED1) and three-terminal regulator block IC10 (7805) (+5V) etc. form.
(4) integrated circuit (IC) 13 (CC4093) is an inverter, and its effect is the level "0" signal that SW2-1 and SW3-1 are provided to single-chip microcomputer when SW2 or SW3 action.
2, receiving-member operation principle
This part mainly is made up of monolithic FM reception integrated circuit (IC) 1 (MC3363), data amplitude limiter IC2 (MC33172) and low-power audio amplifier IC3 (MC34119) etc.(please referring to Fig. 4)
MC3363 in this machine is a synthetic receiver system of being exported to the sound preamplifier by radio frequency amplifier of complete frequency modulation 10 channel frequencys.Wherein 10 channel frequencys are synthetic is to be combined and produce with reception phase-locked loop frequency synthesizer (in MC145162) among Fig. 5 as the VCO (voltage controlled oscillator) of the synthetic receiver of phase-locked loop frequency by first local oscillator in this system.
Data amplitude limiter IC2 (MC33172) is the data-signal of using for the preceding communication of " main exhaling " machine and the conversation of " by exhaling " machine.For example address code, channel code etc. are made shaping and amplitude limit usefulness, so that provide single-chip microcomputer to receive data (RX-DATA) signal.
Audio voltage signal rate of doing work amplification after low-power audio amplifier IC3 (MC34119) expands as demodulation is emitted speech to promote loud speaker SPK.
Low power tube Q5 and Q6 are used for automatically control and supply with the break-make of receiving unit (V-RX) and radiating portion power supply (V-TX), and its control signal is supplied with by two phase-locked loop circuit 11 pin and 13 pin.
Be capacitor C 23 between the pin 25 and 26 of FM reception integrated circuit (IC) 1 and the K2-2 of C24 and diverter switch K2 as the frequency inverted key that receives voltage controlled oscillator in the receiving-member.The pin 26 of FM reception integrated circuit (IC) 1 is connected with the K2-2 change over contact of diverter switch K2, and pin 25 is connected with the normally open contact of K2-2 by capacitor C 23, and is connected with the normally closed interlock of K2-2 by C24.When K2 was failure to actuate, receive frequency was f1, then became f2 after the action.
3, emission element operation principle
This part mainly is made up of monolithic fm transmitter system (comprising MC2833, MC74AC132N and two fet power pipes etc.), two phase-locked loop frequency synthesizer IC4 (MC145162) and compander IC8 circuit such as (MC33111).
This machine fm transmitter system mainly is input to by emission voltage controlled oscillator (VC0) from microphone amplifier by monolithic frequency modulation emission integrated circuit (MC2833) and combines with emission phase-locked loop frequency synthesizer (among MC145162) and the synthetic fm transmitter system of 10 channel frequencys that produces triggers the exciting circuit of shaping circuit and the parallel connection of three grades of Shi Mituo circuit again via one-level Shi Mituo, after be transported to antenna after the field effect power tube amplification of two parallel connections and launch.
The function of two phase-locked loop frequency synthesizer (MC145162) is aforesaid frequency synthesis receiver system and the synthetic fm transmitter system of 10 channel frequencys of being controlled voltage controlled oscillator (VCO) generation 10 channels in receiving system and the emission system by single-chip microcomputer respectively.Communication channel (" 0 " channel) between " main exhaling " machine and " by exhaling " machine also is provided simultaneously.
The major function of compander IC8 (MC33111) is will be undertaken by the voice signal that microphone MIC sends into earlier sending among the IC6 (MC2833) after the compression of voltage amplitude carrying out frequency modulation again.The voice signal after demodulation that will receive again simultaneously carries out sending among the audio-frequency power amplifier IC3 (MC34119) after the voltage expansion again and carries out power amplifier, sends speech from loud speaker.
As the frequency inverted of emission voltage controlled oscillator, key is in the frequency modulation emission integrated circuit (IC) 6 K3-2 of capacitor C 55 and C56 and diverter switch K3 between the pin 15 and 16 in the emission element.Capacitor C 61 that is connected with pin 11 among the IC6 and C62 also will do corresponding conversion by K3-1 simultaneously.Tranmitting frequency is f1 when K3 is failure to actuate, and then becomes f2 after the action.Be connected capacitor C 61 and inductance L 4 between the pin 11 of frequency modulation emission integrated circuit (IC) 6 and the K3-1 change over contact of diverter switch K3; And with the normally closed interlock of K3-1 between be connected capacitor C 62.The K3-2 change over contact is connected with capacitor C 57 with pin 16, and the normally closed interlock of K3-2 is connected with pin 15 by capacitor C 55, is connected with capacitor C 56 between the pin 15 and 16.
4, single-chip microcomputer, keyboard and display part operation principle
This part mainly is made up of single-chip microcomputer IC5 (MC68HC (7) 05L5FU), keyboard, six LCDs (YXY6033D) and E2PROM chip (AT24C02 type) etc.
Single-chip microcomputer is the control centre of this machine system, and mainly the software program flow process of writing by three kinds of operating states of this machine voice procedure is carried out the automatic control of communication process.
Keyboard adopts 4 * 4 conductive rubber keys, and its major function is for providing when making a phone call by " by exhaling " machine address code and relevant special-purpose operating key etc.
The luminous tube LED1-LED5 etc. that " main exhale " switch SW 2, " callback " switch SW 3, " economize on electricity " switch SW 4, inverter circuit (CC4093) also is housed on the finger-board and indicates various functions.(see figure 1)
LCDs mainly in time shows the address code of " by exhaling " machine master pager and the channel value of selected idle channel etc. by the software program requirement under the control of single-chip microcomputer.
E2PROM chip (AT24C02 type) but be the register that electricity consumption is wiped, be used for storing two address codes of each number machine in the key telephone set: group busy plane No. and individual calling machine the numbering.Then can adopt electric method for deleting that old numbering is wiped to write new numbering again as changing plane No..More convenient during use.
Operation principle block diagram of the present utility model is as shown in Figure 2:
1, every unit is made up of antenna, duplexer, receiving system, emission system, switched system, two phase-locked loop frequency synthesizer, single-chip microcomputer, compander, amplitude limiter, audio frequency amplifier, microphone, display, ringer and supervisory keyboard etc.
2, give two phase-locked loop frequency synthesizer transport channel control code by system's programming Control single-chip microcomputer, thereby the multiple frequency values of required talk channel is provided.
3, the native system communication channel is made of 10 pairs of talk channels temporarily, is searched for automatically by Single Chip Microcomputer (SCM) program.The switching of frequency is undertaken by hand-guided.
The mode of operation of this group's phone is as follows:
1, all be in " waiting for " state after the start of all machines in the system, have only the receiving system Waiting for Call that works on this moment, emission system then is in not emission state." 0 " channel is adopted in communication.
2, group busy working method: when arbitrary unit will be grouied busy all machines as lead aircraft in the system, at first switch " main exhaling " switch, by the logical all machines of " 00 " address code utilization " 0 " channel call, (each unit is except that oneself being arranged independently the address code, all have group busy use the 00# address code), treat each power ringing after, connect " callback " switch, get final product direct and the lead aircraft dialogue, can not directly converse between each unit this moment.
3, individual calling working method: converse between the unit, at first, by the pager address code, carry out the spatial channel search then, behind certain idle channel to be determined, above-mentioned two group codes are added that " master exhales " plane No. launches simultaneously by logical by logical " main exhaling " switch.After waiting " callback " signal of " by exhaling " machine then, change definite idle channel over to and wait for.After being received this machine address code by pager, ring, should be immediately by logical " callback " switch, at this moment, Single-chip Controlling by the automatic callback master of pager pager after receive-transmit system change definite idle channel over to, can carry out duplex and converse.
4, if do not started shooting by pager, or fail to receive the call signal that main pager is sent, owing to do not receive that callback code book machine just sends " busy tone " signal, main pager should cut off " main exhaling " switch to then main pager, allows this machine be returned to " wait " state at the appointed time.Select suitable time repeated call.
The brief description of the utility model program is as follows:
1, voice procedure is determined by three kinds of operating states, and first kind is " waiting for " operating state, and second kind is " main exhaling " operating state, and the third is " callback " operating state.
2, " wait for " the operating state flow process
1. start (mains switch SW1=1), power supply indicator is bright; If when cell voltage was not enough, then alarm lamp LED5 was bright, (SW1=0) the 2. initialization of should shutting down immediately this moment: make emission voltage disconnect (VTX=0), receive voltage and intermittently connect (1/4T connects, and 3/4T disconnects); The two phase-locked loop circuit only provides receiving system " 0 " channel frequency.
3, " main exhaling " operating state flow process
When certain number machine is led when exhaling, can be undertaken by " main exhaling " program: 1. at first by logical " main exhaling " switch (SW2=1), " main exhaling " indicator light LED2 is bright.2. switch " 0 " channel frequency, will " main exhale " reception of machine becomes with the frequency inverted of emission with " by exhaling " machine is corresponding transmit and receive " frequency " 3. keypad import by back two plane No. of pager, and show H, then can be removed if push the wrong plane No. by " pin number " key D.4. press assignment key F, judge the correctness of keying in plane No., if do not press by the pager plane No. again to then needing.5. the plane No. of being gone into by keys of single chip microcomputer is tabled look-up and is obtained by 6 complete plane No. of pager, and this is promptly by the address code of pager.6. select " free time " channel, " the signal strength signal intensity indication " that receives at this channel when receiving system is " free time " channel when being high level (RSSI=1), and shows.7. will and lead and exhale plane No. to form the data splitting frame by the address code of pager and selected " free time " channel number by single-chip microcomputer.8. by " emission " key G the data splitting frame is emitted to by pager.Wait by the callback signal of pager.9. (t 〉=20 second) then main pager sends " busy tone " signal immediately if the time of waiting the callback signal exceeds schedule time, and main pager just can turn back to " waiting for " state by " main exhaling " switch shutdown (SW2=0).10. if main pager receives that the callback signal of being sent by pager then will be launched by single-chip microcomputer and receive frequency converts selected " free time " channel value to, both sides just can carry out the duplex conversation, until end of conversation.Main pager should be pressed " main exhaling " switch shutdown (SW2=0) immediately behind both sides' end of conversation, and this moment, main pager just turned back to " waiting for " operating state.
4, exhaled the operating state flow process
Can be undertaken by " by exhaling " program by pager:
Be 1. decoding immediately, to differentiate the address code of this machine after certain number machine captures " calling " signal that main pager sends? if 2. this machine address code instant ring and show main plane No. A and " free time " channel value of exhaling then.3. should be after being heard ringing tone by pager immediately by " callback " switch (SW3=1).4. sent the callback signal and will launch with receive frequency from trend master pager by single-chip microcomputer and convert selected " free time " channel value B to, both sides just can carry out duplex and converse, up to end of conversation.4. behind both sides' end of conversation, should be pressed " callback " switch shutdown (SW3=0) immediately, just be turned back to " waiting for " operating state this moment by pager by pager.
Fig. 1 is a front of the present utility model outline drawing.Be provided with 10 numeric keys 0 to 9, SW2 is that main to exhale switch, SW3 be the callback switch, and SW4 is a battery-conserving switch, and D is the pin key, and F is an assignment key, and G is an emission key, and U is a LCD, and the A district of its LCDs H shows that the main plane No., B district of exhaling be to believe the free time to lead to value; SW1 is a mains switch, and LED2 is that main to exhale indication, LED3 be the callback indication, and LED1 is the power supply indication, and LED4 is the economize on electricity indication, and LED5 is an alarm lamp, and SPK is a loud speaker, and MIC is a microphone, and ANT is a telescopic antenna, and W2 is that volume is regulated.
Fig. 6 is single-chip microcomputer of the present utility model, keyboard and display unit electrical schematic diagram.Single-chip microcomputer IC5 is MC68HC (7) 05L5FU, E
2The PROM chip is the AT24CO2 type, but register is wiped in electricity consumption.LCD U is YXY6033D, has six LCDs H.IC7 is MC33172.LED5 is an alarm lamp.Its keyboard sees Fig. 1 explanation for details.
Claims (2)
1, the no center of double frequency duplex wireless group telephone comprises power supply unit, receiving-member, emission element, single-chip microcomputer, keyboard and display unit, it is characterized in that, also is provided with
Duplexer, duplexer are by antenna and two the first filtering unit SAW1 and the 3rd filtering unit SAW3 that frequency filtering is f1; Two the second filtering unit SAW2 and the 4th filtering unit SAW4 compositions that frequency filtering is f2; One end of first, second filtering unit is connected with antenna, the other end of first filtering unit is connected with the K1-2 normally open contact with the K1-1 normally closed interlock of diverter switch K1, the other end of second filtering unit is connected with the K1-2 normally closed interlock with the K1-1 normally open contact of diverter switch K1, the change over contact of diverter switch K1-1 is connected with the 4th filtering unit with the 3rd filtering unit, and the change over contact of diverter switch K1-2 is connected with the terminal of emission element (19); The other end of the 3rd filtering unit is connected with the K2-1 normally closed interlock of diverter switch K2, and the other end of the 4th filtering unit is connected with the K2-1 normally open contact of diverter switch K2, and the change over contact of diverter switch K2-1 is connected with the terminal of receiving-member (11);
The frequency switching part comprises main exhale switch (SW2) and callback switch (SW3), diverter switch K1, K2, K3 and inverter ic 13; The master exhales the terminal 1 of the SW2-1 of switch (SW2) to connect 12,13 pin of diverter switch K1, K2, K3 and inverter ic 13; The main terminal 1 of the SW2-2 of switch (SW2) of exhaling is connected with cutter and the terminal 1 of SW3-2 and the terminal (20) of emission element of the SW3-1 of callback switch (SW3); The master exhales the cutter of switch (SW2) SW2-2 to be connected with the cutter of power supply E and callback switch SW 3-2; 1 of inverter ic 13,2 pin are connected with the terminal 1 of the SW3-1 of callback switch (SW3) by resistance R 68,3 pin of inverter ic 13 are connected with the pin 46,45 of single-chip microcomputer IC5 respectively with 11 pin, the pin 14 of inverter ic 13 exhales the cutter of switch (SW2) SW2-1 to be connected with 2 pin of IC10 with main, pin 7 ground connection of inverter ic 13, pin 1,2 is received between resistance R 68 and the R69.
2, by the no center of the described double frequency duplex of claim 1 wireless group telephone, it is characterized in that, the pin 26 of the FM reception integrated circuit (IC) 1 of receiving-member is connected with the K2-2 change over contact of diverter switch K2, and pin 25 is connected with the normally open contact of K2-2 by capacitor C 23; And be connected with the normally closed interlock of K2-2 by C24; Be connected capacitor C 61 and inductance L 4 between the pin 11 of the frequency modulation of emission element emission integrated circuit (IC) 6 and the K3-1 change over contact of diverter switch K3; And with the normally closed interlock of K3-1 between be connected capacitor C 62; The K3-2 change over contact is connected with capacitor C 57 with pin 16, and the normally closed interlock of K3-2 is connected with pin 15 by capacitor C 55, is connected with capacitor C 56 between the pin 15 and 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96241760U CN2272633Y (en) | 1996-11-14 | 1996-11-14 | Double-frequency double-function center-free radio group telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96241760U CN2272633Y (en) | 1996-11-14 | 1996-11-14 | Double-frequency double-function center-free radio group telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2272633Y true CN2272633Y (en) | 1998-01-14 |
Family
ID=33916077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96241760U Expired - Fee Related CN2272633Y (en) | 1996-11-14 | 1996-11-14 | Double-frequency double-function center-free radio group telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2272633Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320778C (en) * | 2000-11-01 | 2007-06-06 | 日立金属株式会社 | High-frequency switch module |
| CN103378868A (en) * | 2012-04-18 | 2013-10-30 | 泉州欧讯电子有限公司 | Vehicle-mounted intercom having dual-band duplex cross-band transfer function |
| CN103379390B (en) * | 2012-04-18 | 2015-11-18 | 泉州欧讯电子有限公司 | There is the Vehicular intercom that two-band can receive simultaneously |
| CN108900204A (en) * | 2018-06-27 | 2018-11-27 | 郑州菘天电子科技有限公司 | A kind of method of antenna frequencies and transmitter positive match |
-
1996
- 1996-11-14 CN CN96241760U patent/CN2272633Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320778C (en) * | 2000-11-01 | 2007-06-06 | 日立金属株式会社 | High-frequency switch module |
| CN103378868A (en) * | 2012-04-18 | 2013-10-30 | 泉州欧讯电子有限公司 | Vehicle-mounted intercom having dual-band duplex cross-band transfer function |
| CN103378868B (en) * | 2012-04-18 | 2015-08-05 | 泉州欧讯电子有限公司 | There is the Vehicular intercom of two section duplex across rotating function in section |
| CN103379390B (en) * | 2012-04-18 | 2015-11-18 | 泉州欧讯电子有限公司 | There is the Vehicular intercom that two-band can receive simultaneously |
| CN105071822A (en) * | 2012-04-18 | 2015-11-18 | 泉州欧讯电子有限公司 | Vehicle-mounted intercom having a dual-band duplex cross-band transfer function |
| CN105207691A (en) * | 2012-04-18 | 2015-12-30 | 泉州欧讯电子有限公司 | Vehicle-mounted interphone conducting receiving at two frequency bands simultaneously |
| CN105207691B (en) * | 2012-04-18 | 2017-07-25 | 泉州欧讯电子有限公司 | The Vehicular intercom that two-band is received simultaneously |
| CN108900204A (en) * | 2018-06-27 | 2018-11-27 | 郑州菘天电子科技有限公司 | A kind of method of antenna frequencies and transmitter positive match |
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