CN106817137B - Medium-power VHF/UHF four-band wireless simulation vehicle-mounted station - Google Patents
Medium-power VHF/UHF four-band wireless simulation vehicle-mounted station Download PDFInfo
- Publication number
- CN106817137B CN106817137B CN201710177599.XA CN201710177599A CN106817137B CN 106817137 B CN106817137 B CN 106817137B CN 201710177599 A CN201710177599 A CN 201710177599A CN 106817137 B CN106817137 B CN 106817137B
- Authority
- CN
- China
- Prior art keywords
- pass filter
- unit
- switching circuit
- mhz high
- transmitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The invention discloses a medium-power VHF/UHF four-band wireless simulation vehicle-mounted station, which comprises an antenna, an antenna switch transceiving switching circuit, a first switching circuit, a 136-plus 174MHz high-pass filter, a 220-plus 270MHz high-pass filter, a 350-plus 390MHz high-pass filter, a 400-plus 480MHz high-pass filter, a first receiving unit, a second receiving unit, a third receiving unit, a fourth receiving unit, a microprocessor control unit, a transceiving processing unit, a second switching circuit, a transmitting unit, a receiving unit and a transmitting unit. Compared with the prior art, the invention adopts a specially designed channel switching mode to realize the free switching of four VHF/UHF communication frequency bands with small frequency span.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a wireless simulation vehicle-mounted platform.
Background
The vehicle-mounted platform is a wireless interphone which can be mounted on vehicles, ships, airplanes and other vehicles, is directly powered by an external power supply and uses an external antenna, and is mainly used for traffic transportation, production scheduling, security command and other services. The general vehicle-mounted station mostly works in VHF/UHF ultra-short wave band, and is characterized in that the signal transmission of a line-of-sight propagation mode is stable, and if no larger obstacle blocks the signal transmission, the communication distance can reach more than ten kilometers and even dozens of kilometers.
The existing VHF/UHF wireless simulation vehicle-mounted station has the following problems:
1. the switching of VHF (136MHz-174MHz) and UHF (400MHz-480MHz) frequency bands can only be realized, the frequency span is large, and the communication requirements of 220MHz-270MHz and 350MHz-390MHz frequency bands cannot be simultaneously covered.
2. The working current of the high-power vehicle-mounted platform is about 8A, and the installation of the high-power vehicle-mounted platform requires professional staff to wire the storage battery, so that the installation is inconvenient.
3. Only has the function of an external loudspeaker, and cannot have the function of emitting by an earphone or a helmet type earphone.
4. Only dual-channel waiting cannot meet the communication requirements of a plurality of waiting channels.
Disclosure of Invention
The invention aims to provide a medium-power VHF/UHF four-band wireless simulation vehicle-mounted station which can realize free switching of four VHF/UHF communication bands with small frequency span.
In order to achieve the purpose, the invention adopts the following technical scheme:
the medium-power VHF/UHF four-band wireless simulation vehicle-mounted station comprises an antenna, an antenna switch transceiving switching circuit, a first switching circuit, a 136-plus-174 MHz high-pass filter, a 220-plus-270 MHz high-pass filter, a 350-plus-390 MHz high-pass filter, a 400-plus-480 MHz high-pass filter, a first receiving unit, a second receiving unit, a third receiving unit, a fourth receiving unit, a microprocessor control unit, a transceiving processing unit, a second switching circuit, a transmitting unit, a receiving unit and a transmitting unit;
the antenna is connected with the antenna switch receiving and transmitting switching circuit in a bidirectional way; the antenna switch transceiving switching circuit is respectively bidirectionally connected with the 136-174 MHz high-pass filter, the 220-270 MHz high-pass filter and the first switching circuit; the first switching circuit is respectively connected with the 350-390 MHz high-pass filter and the 400-480 MHz high-pass filter in a bidirectional way; the output end of the 136-174 MHz high-pass filter, the output end of the 220-270 MHz high-pass filter, the output end of the 350-390 MHz high-pass filter and the output end of the 400-480 MHz high-pass filter are respectively connected to the input end of the transceiving processing unit through the first receiving unit, the second receiving unit, the third receiving unit and the fourth receiving unit; the receiving unit is connected with the audio output end of the receiving and transmitting processing unit, the transmitting unit is connected with the audio input end of the receiving and transmitting processing unit, the frequency modulation output end of the receiving and transmitting processing unit is connected with the input end of the transmitting unit, the output end of the transmitting unit is respectively connected with the corresponding input end of the 136-plus-174 MHz high-pass filter, the corresponding input end of the 220-plus-270 MHz high-pass filter and the input end of the second switching circuit, and the output end of the second switching circuit is respectively connected with the corresponding input end of the 350-plus-390 MHz high-pass filter and the corresponding input end of the 400-plus-480 MHz high-pass filter; the receiving and transmitting processing unit is bidirectionally connected with the microprocessor control unit, and the corresponding output ends of the microprocessor control unit are respectively connected with the switching control ends of the antenna switch receiving and transmitting switching circuit, the first switching circuit and the second switching circuit.
The microprocessor control unit is connected with a four-channel display unit in a bidirectional mode, the display area of the four-channel display unit is divided into four main frequency display areas, a function menu of the vehicle-mounted platform is provided with four-channel waiting function options, and a corresponding four-channel waiting program is arranged in the microprocessor control unit.
The transmitting unit adopts a medium-power radio frequency transmitter with transmitting current of about 4A.
The medium-power VHF/UHF four-frequency-band wireless simulation vehicle-mounted platform is provided with a 3.5mm four-section type earphone jack and a 3.5mm four-section type earphone plug, and the four-section type earphone plug is correspondingly connected with a loudspeaker, a microphone, a ground wire and a transmitting key from inside to outside respectively.
After the scheme is adopted, the radio frequency signal amplified by the transmitting unit of the medium-power VHF/UHF four-frequency-band wireless simulation vehicle-mounted station is divided into three channels, wherein the first channel is VHF1(136MHz-174MHz), the second channel is VHF2(220MHz-270MHz), the third channel is UHF, the third channel is divided into two UHF1(350MHz-390MHz) and UHF2(400MHz-480MHz) through the second switching circuit, after all the channels pass through the corresponding high-pass filters, the two UHF channels are combined into an output port through the first switching circuit and then are connected with the VHF1 into an output port, and the connected output port and the VHF2 are switched into a unique output port through the antenna switch transceiving switching circuit to be connected with an antenna. Compared with the prior art, the invention adopts the specially designed channel switching mode to realize the free switching of four VHF/UHF communication frequency bands with small frequency span.
Furthermore, in the invention, the microprocessor control unit is bidirectionally connected with a four-channel display unit, the display area of the four-channel display unit is divided into four main frequency display areas, the function menu of the vehicle-mounted platform is provided with four-channel waiting function options, and the microprocessor control unit is internally provided with a corresponding four-channel waiting program, so that the four channels can be alternately waiting, and the communication requirements of a plurality of waiting channels are met.
Furthermore, in the invention, the transmitting unit adopts a medium-power radio-frequency transmitter with the current of about 4A, so that a cigarette lighter on a vehicle can be used for getting electricity, and the installation is convenient and simple.
Furthermore, the medium-power VHF/UHF four-frequency-band wireless simulation vehicle-mounted platform is provided with a 3.5mm four-section type earphone jack and a 3.5mm four-section type earphone plug, and the four-section type earphone plug is correspondingly connected with a loudspeaker, a microphone, a ground wire and a transmitting key from inside to outside respectively. Through the design, the portable outdoor air conditioner has better portability and can meet the requirements of field operation.
Drawings
Fig. 1 is a schematic block diagram of the circuit of the present invention.
Detailed Description
The middle-power VHF/UHF four-band wireless simulation vehicle-mounted station comprises an antenna 1, an antenna switch transceiving switching circuit 2, an antenna switch transceiving switching circuit 3, a 220-plus 270-MHz high-pass filter 4, a first switching circuit 5, a first receiving unit 6, a second receiving unit 7, a 350-plus 390-MHz high-pass filter 8, a 400-plus 480-MHz high-pass filter 9, a third receiving unit 10, a fourth receiving unit 11, a microprocessor control unit 12, a second switching circuit 13, a transceiving processing unit 14, a transmitting unit 15, a receiving unit 16 and a transmitting unit 17, as shown in FIG. 1.
The antenna 1 is bidirectionally connected with the antenna switch transceiving switching circuit 2; the antenna switch transceiving switching circuit 2 is respectively connected with the 136-174 MHz high-pass filter 3, the 220-270 MHz high-pass filter 4 and the first switching circuit 5 in two directions; the first switching circuit 5 is respectively connected with the 350-390 MHz high-pass filter 8 and the 400-480 MHz high-pass filter 9 in two directions; the output terminal of the 136-174 MHz high-pass filter 3, the output terminal of the 220-270 MHz high-pass filter 4, the output terminal of the 350-390 MHz high-pass filter 8 and the output terminal of the 400-480 MHz high-pass filter 9 are respectively connected to the input terminal of the transceiving processing unit 14 through the first receiving unit 6, the second receiving unit 7, the third receiving unit 10 and the fourth receiving unit 11; the receiving unit 16 is connected to the audio output end of the transceiving processing unit 14, the transmitting unit 17 is connected to the audio input end of the transceiving processing unit 14, the frequency modulation output end of the transceiving processing unit 14 is connected to the input end of the transmitting unit 15, the output end of the transmitting unit 15 is respectively connected to the corresponding input end of the 136-plus-174 MHz high-pass filter 3, the corresponding input end of the 220-plus-270 MHz high-pass filter 4 and the input end of the second switching circuit 13, and the output end of the second switching circuit 13 is respectively connected to the corresponding input end of the 350-plus-390 MHz high-pass filter 8 and the corresponding input end of the 400-plus-480 MHz high-pass filter 9; the transceiving processing unit 14 is bidirectionally connected to the microprocessor control unit 12, and corresponding output terminals of the microprocessor control unit 12 are respectively connected to the switching control terminals of the antenna switch transceiving switching circuit 2, the first switching circuit 5, and the second switching circuit 13.
Further, the microprocessor control unit 12 is bidirectionally connected with a four-channel display unit 18, a display area of the four-channel display unit 18 is reasonably divided into four main frequency display areas, a function menu of the vehicle-mounted platform is provided with four-channel waiting function options, and the microprocessor control unit 12 is internally provided with a corresponding four-channel waiting program.
Further, the transmitting unit 15 employs a medium power radio frequency transmitter with a transmitting current of about 4A. Thereby can adopt the cigar lighter on the car to get the electricity, simple to operate is simple and easy.
Furthermore, the medium-power VHF/UHF four-frequency-band wireless simulation vehicle-mounted platform is provided with a 3.5mm four-section type earphone jack and a 3.5mm four-section type earphone plug, and the four-section type earphone plug is correspondingly connected with a loudspeaker, a microphone, a ground wire and a transmitting key from inside to outside respectively. Through the design, the portable outdoor air conditioner has better portability and can meet the requirements of field operation.
The working principle of the invention is as follows:
the antenna switch transceiving switching circuit 2 automatically switches to a receiving mode or a transmitting mode according to the working state of the circuit.
In transmit mode:
the microprocessor control unit 12 sends the frequency signaling information to be transmitted to the transceiving processing unit 14, meanwhile, the microprocessor control unit 12 switches a high-pass filter channel corresponding to the rear stage according to the detected frequency range, the transceiving processing unit 14 responds to the received information to generate a radio frequency carrier, the radio frequency carrier and a voice signal of the transmitting unit 17 are mixed to form a frequency modulation signal and sent to the transmitting unit 15 for power amplification, and the amplified medium-power signal is transmitted to the antenna 1 through the selected channel for radio frequency transmission.
The microprocessor control unit 12 switches the high-pass filter channel corresponding to the next stage according to the detected frequency range, which is as follows: if the detected frequency range is 136MHz-174MHz, the microprocessor control unit 12 controls the antenna switch transceiving switching circuit 2 to switch the channel where the 136MHz-174MHz high pass filter 3 is located; if the detected frequency range is 220MHz-270MHz, the microprocessor control unit 12 controls the antenna switch transceiving switching circuit 2 to switch the channel where the 220MHz-270MHz high pass filter 4 is located; if the detected frequency range is 350MHz-390MHz, the microprocessor control unit 12 controls the second switching circuit 13 to switch the channel where the 350MHz-390MHz high pass filter 8 is located; if the detected frequency range is 400MHz-480MHz, the microprocessor control unit 12 controls the second switching circuit 13 to switch the channel where the 400MHz-480MHz high-pass filter 9 is located.
In the invention, the working principle of switching the VHF/UHF four-band high-frequency transceiving channels is as follows:
the rf signal amplified by the transmitting unit 15 is divided into three channels by the drain output of the power transistor of the transmitting unit 15, wherein the first channel is a VHF1 channel (136MHz-174MHz), the second channel is a VHF2 channel (220MHz-270MHz), the third channel is a UHF channel, the third channel is divided into two UHF1 channels (350MHz-390MHz) and a UHF2 channel (400MHz-480MHz) by a second switching circuit 13, the VHF1 channel, the VHF2 channel, the UHF1 channel and the UHF2 channel pass through a 136MHz-174MHz high-pass filter 3, a 220MHz-270MHz high-pass filter 4, a 350MHz-390MHz high-pass filter 8 and a 400MHz-480MHz high-pass filter 9 respectively, the UHF1 channel and the UHF2 channel are combined into an output port through the first switching circuit 5 and then are combined with the VHF1 channel into an output port, the output port and the VHF2 channel after being connected in parallel are switched into a unique output input port through an antenna switch transceiving switching circuit 2 to be connected with an antenna 1.
Compared with the prior art, the invention adopts the specially designed channel switching mode to realize the free switching of four VHF/UHF communication frequency bands with small frequency span.
In a receive mode:
the microprocessor control unit 12 sends the frequency signaling information to be received to the transceiving processing unit 14, meanwhile, the microprocessor control unit 12 switches the high-pass filter channel corresponding to the rear stage according to the detected frequency range, the radio-frequency signal received by the antenna 1 is subjected to gain amplification through the corresponding receiving unit, and the amplified radio-frequency signal is transmitted to the transceiving processing unit 14 to demodulate the signal to generate a voice signal, and the voice signal is transmitted to the receiving unit 16 to drive the loudspeaker to generate sound.
The microprocessor control unit 12 switches the high-pass filter channel corresponding to the next stage according to the detected frequency range, which is as follows: if the detected frequency range is 136MHz-174MHz, the microprocessor control unit 12 controls the antenna switch transceiving switching circuit 2 to switch the channel where the 136MHz-174MHz high pass filter 3 is located; if the detected frequency range is 220MHz-270MHz, the microprocessor control unit 12 controls the antenna switch transceiving switching circuit 2 to switch the channel where the 220MHz-270MHz high pass filter 4 is located; if the detected frequency range is 350MHz-390MHz, the microprocessor control unit 12 controls the first switching circuit 5 to switch the channel where the 350MHz-390MHz high pass filter 8 is located; if the detected frequency range is 400MHz-480MHz, the microprocessor control unit 12 controls the first switching circuit 5 to switch the channel where the 400MHz-480MHz high pass filter 9 is located.
In the invention, the working principle of four-channel display four-channel waiting is as follows:
the display area of the four-channel display unit 18 is divided equally into four main frequency display areas by reasonable allocation. After the communication is finished, the used channels need to be waited, a four-channel waiting function is selected by combining a function menu of the vehicle-mounted platform, the microprocessor control unit 12 sequentially sends the receiving frequency and the signaling information to the transceiving processing unit 14 according to the communication frequency displayed on the four-channel display unit 18, meanwhile, the microprocessor control unit 12 switches the high-pass filter channel corresponding to the rear stage according to the detection frequency range, keeps the current channel smooth, sequentially sends the next group of channel information under the condition that the current channel is determined to be idle, and sequentially and repeatedly circulates to achieve the waiting of the four channels in turn.
In the present invention, the antenna switch transceiving switching circuit 2, the first switching circuit 5, and the second switching circuit 13 are all existing circuits, and control programs that can automatically switch to corresponding operating states according to the frequency band of the radio frequency signal are also known.
Claims (4)
1. Medium-power VHF/UHF four-band wireless simulation vehicle-mounted station, its characterized in that: comprises an antenna, an antenna switch transceiving switching circuit, a first switching circuit, a 136-plus-174 MHz high-pass filter, a 220-plus-270 MHz high-pass filter, a 350-plus-390 MHz high-pass filter, a 400-plus-480 MHz high-pass filter, a first receiving unit, a second receiving unit, a third receiving unit, a fourth receiving unit, a microprocessor control unit, a transceiving processing unit, a second switching circuit, a transmitting unit, a receiving unit and a transmitting unit;
the antenna is connected with the antenna switch receiving and transmitting switching circuit in a bidirectional way; the antenna switch transceiving switching circuit is respectively bidirectionally connected with the 136-174 MHz high-pass filter, the 220-270 MHz high-pass filter and the first switching circuit; the first switching circuit is respectively connected with the 350-390 MHz high-pass filter and the 400-480 MHz high-pass filter in a bidirectional way; the output end of the 136-174 MHz high-pass filter, the output end of the 220-270 MHz high-pass filter, the output end of the 350-390 MHz high-pass filter and the output end of the 400-480 MHz high-pass filter are respectively connected to the input end of the transceiving processing unit through the first receiving unit, the second receiving unit, the third receiving unit and the fourth receiving unit; the receiving unit is connected with the audio output end of the receiving and transmitting processing unit, the transmitting unit is connected with the audio input end of the receiving and transmitting processing unit, the frequency modulation output end of the receiving and transmitting processing unit is connected with the input end of the transmitting unit, the output end of the transmitting unit is respectively connected with the corresponding input end of the 136-plus-174 MHz high-pass filter, the corresponding input end of the 220-plus-270 MHz high-pass filter and the input end of the second switching circuit, and the output end of the second switching circuit is respectively connected with the corresponding input end of the 350-plus-390 MHz high-pass filter and the corresponding input end of the 400-plus-480 MHz high-pass filter; the receiving and transmitting processing unit is bidirectionally connected with the microprocessor control unit, and the corresponding output ends of the microprocessor control unit are respectively connected with the switching control ends of the antenna switch receiving and transmitting switching circuit, the first switching circuit and the second switching circuit.
2. The medium-power VHF/UHF quad-band wireless analog vehicle-mounted station of claim 1, wherein: the microprocessor control unit is connected with a four-channel display unit in a bidirectional mode, the display area of the four-channel display unit is divided into four main frequency display areas, a function menu of the vehicle-mounted platform is provided with four-channel waiting function options, and a corresponding four-channel waiting program is arranged in the microprocessor control unit.
3. The medium-power VHF/UHF quad-band wireless analog vehicle-mounted station of claim 1, wherein: the transmitting unit adopts a medium-power radio-frequency transmitter with transmitting current 4A.
4. The medium-power VHF/UHF quad-band wireless analog vehicle-mounted station of claim 1, wherein: the earphone plug is provided with a 3.5mm four-section earphone jack and is provided with a 3.5mm four-section earphone plug, and the four-section earphone plug is correspondingly connected with a loudspeaker, a microphone, a ground wire and a transmitting key from inside to outside respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710177599.XA CN106817137B (en) | 2017-03-23 | 2017-03-23 | Medium-power VHF/UHF four-band wireless simulation vehicle-mounted station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710177599.XA CN106817137B (en) | 2017-03-23 | 2017-03-23 | Medium-power VHF/UHF four-band wireless simulation vehicle-mounted station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106817137A CN106817137A (en) | 2017-06-09 |
| CN106817137B true CN106817137B (en) | 2022-03-11 |
Family
ID=59115470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710177599.XA Active CN106817137B (en) | 2017-03-23 | 2017-03-23 | Medium-power VHF/UHF four-band wireless simulation vehicle-mounted station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106817137B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327782B (en) * | 2020-11-17 | 2022-05-17 | 青岛鼎信通讯股份有限公司 | Switch chip data scheduling circuit for medium-voltage management machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI226761B (en) * | 2003-05-08 | 2005-01-11 | Ind Tech Res Inst | Dual band transceiver architecture for wireless application |
| CN100417036C (en) * | 2004-04-02 | 2008-09-03 | 大唐移动通信设备有限公司 | Message machine of receiving-transmitting time-division duplex wireless communication system |
| CN101465679B (en) * | 2007-12-20 | 2012-09-05 | 启碁科技股份有限公司 | Wireless signal transmitting/receiving device and relevant device |
| CN101841346B (en) * | 2009-03-19 | 2014-01-15 | 鸿富锦精密工业（深圳）有限公司 | Wireless transceiver |
| CN102611472A (en) * | 2011-12-26 | 2012-07-25 | 深圳市虹远通信有限责任公司 | Multiband wireless signal transceiver system |
| CN103595437B (en) * | 2013-11-14 | 2015-08-26 | 泉州市琪祥电子科技有限公司 | A kind of multimedia multiband can receive the intercom of analog and digital signal simultaneously |
| CN207218671U (en) * | 2017-03-23 | 2018-04-10 | 南安市泉益电子器材有限公司 | The middle frequency range wireless simulation Vehicle mounted stations of power VHF/UHF tetra- |
-
2017
- 2017-03-23 CN CN201710177599.XA patent/CN106817137B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106817137A (en) | 2017-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202998086U (en) | A multi-band double-reception band-crossing duplex relay vehicle station | |
| US20140133372A1 (en) | Wireless communication transmitting and receiving system | |
| CN210693937U (en) | 5G indoor distribution system | |
| CN204272108U (en) | A kind ofly can support the communicator of ultrashort wave relaying with short-wave radio set intercommunication | |
| CN103595437A (en) | Multimedia interphone capable of receiving analog and digital signals in multiple frequency bands simultaneously | |
| CN105451132A (en) | UHF frequency band single chip digit modulation wireless microphone system | |
| TW201328174A (en) | Power amplifying circuit and wireless communication device using the same | |
| CN106817137B (en) | Medium-power VHF/UHF four-band wireless simulation vehicle-mounted station | |
| CN104469569A (en) | Solar multi-functional Bluetooth loudspeaker | |
| CN201813364U (en) | Ship platform deck frequency modulation interphone circuit | |
| CN106100685B (en) | Power switching device based on low-power-consumption Bluetooth technology | |
| CN202998085U (en) | A vehicle station hand microphone | |
| CN105071822B (en) | Vehicle-mounted intercom having a dual-band duplex cross-band transfer function | |
| CN203896472U (en) | Vehicle-mounted interphone | |
| CN207218671U (en) | The middle frequency range wireless simulation Vehicle mounted stations of power VHF/UHF tetra- | |
| CN201708793U (en) | Vehicular wireless frequency modulation interphone circuit | |
| CN104602367A (en) | Vehicle earphone radio frequency wireless system | |
| CN205356344U (en) | Relaying communication device of on -vehicle platform of ultrashort wave | |
| CN103743957A (en) | Field intensity test start device | |
| CN103522956B (en) | Hand-held radio telephone expands depressed place and application structure thereof | |
| CN105450285A (en) | Relay communication device for ultrashort-wave vehicle-mounted platform | |
| CN202067384U (en) | Remote controller with wireless audio frequency transmission function | |
| CN201976091U (en) | Car radio based on time division-synchronization code division multiple access (TD-SCDMA) network | |
| CN101083808A (en) | Wireless playing method and system for handset audio | |
| CN204925401U (en) | Vehicle-mounted navigation device with RDS function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |