CN107786226A - A kind of double frequency Vehicular intercom - Google Patents
A kind of double frequency Vehicular intercom Download PDFInfo
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- CN107786226A CN107786226A CN201711160524.7A CN201711160524A CN107786226A CN 107786226 A CN107786226 A CN 107786226A CN 201711160524 A CN201711160524 A CN 201711160524A CN 107786226 A CN107786226 A CN 107786226A
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The invention discloses a kind of inexpensive, high performance double frequency Vehicular intercom, it uses single radio frequency power amplifier tube to realize two-way broadband, high performance UHF and VHF rf power amplifier circuits, the technological difficulties for solving antenna port radio frequency when double frequency Vehicular intercom uses single radio frequency power amplifier tube by increasing isolation control circuit and exporting Out-of-band rejection ability.The another present invention uses UHF and VHF main radio frequency chip of the RDA1846S radio frequencies single-chip as double frequency Vehicular intercom solution, UHF selective frequency amplifier circuits and VHF selective frequency amplifier circuits use the amplifying circuit with varactor tuning frequency-selecting simultaneously, it can reach and filter out, suppress out-of-band interference signal, lifting RDA1846S radio frequency chips receive antijamming capability.Simple circuit of the present invention, cost is low, be readily produced, performance is remarkable.
Description
Technical field
The present invention relates to Vehicular intercom technical field, and in particular to a kind of double frequency Vehicular intercom.
Background technology
Double frequency Vehicular intercom has the characteristics that communication distance remote, strong adaptability, using flexible, is widely used in traffic fortune
The various occasions such as defeated, social service trades, disaster relief and rescue, forest fire protection and emergency communication.Traditional scheme is completely independent using two-way
Discrete component be designed, the launching of UHF and VHF frequency ranges, double independent is respectively completed using Double RF power amplifier tube
UHF and VHF voltage controlled oscillators, phase lock circuitry and receiving circuit etc., system complex, with high costs, cumbersome, the difficult control of uniformity of debugging
System, production first-pass yield is low, so the double frequency Vehicular intercom for being badly in need of a low-cost and high-performance meets the market demand.
UHF power amplifications had not only been done using single radio frequency power tube but also have done VHF power amplification, difficult point is UHF, VHF in antenna
Port radio frequency output Out-of-band rejection capacity index (60dBc) can not meet, can only achieve 40dBc or lower；Certainly can also adopt
VHF radio-frequency switch circuits, UHF radio-frequency switch circuits is replaced to reach related request, but radio-frequency relay cost with radio-frequency relay
It is also higher than the radio frequency power tube of core devices.So to do two-way respectively using two radio frequency power tubes complete for existing market product
Whole UHF and VHF radio frequency transmitter circuitries, so need to use two radio frequency power tube (single radio frequency work(as core devices
Rate pipe takes 20% complete machine cost ratio).
RDA1846S radio frequency chips, because its receiving terminal amplifier uses 130-520MHZ or broader wideband rate amplifiers,
To the out of band signal unrestraint ability received, it is caused to receive poor anti jamming capability.When on applied to hand transceiver, because
Antenna gain is low, shows unobvious.When for Vehicular intercom, antenna gain is higher, and the performance of poor anti jamming capability problem is bright
It is aobvious, cause communication efficiency and range difference.
Above reason causes double frequency Vehicular intercom to be designed using the traditional discrete element of two-way independence, and the market price is high,
Limit extensive use of the double frequency Vehicular intercom in each field.
The content of the invention
It is an object of the invention to provide a kind of inexpensive, high performance double frequency Vehicular intercom.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of two-band Vehicular intercom, including host circuit and hand-held microphone, microphone is provided with hand-held microphone, host circuit
It is mono- that circuit part includes antenna port, VHF wave filter ＆ impedance matching circuits, UHF wave filter ＆ impedance matching circuits, UHF＆VHF
Power tube common radio-frequency amplifying circuit, VHF radio-frequency switch circuits, UHF radio-frequency switch circuits, VHF selective frequency amplifier circuits, UHF choosings
Frequency amplifying circuit, RDA1846S radio frequency chips, audio-frequency power amplifier unit, loudspeaker, display unit, microprocessor, power supply
Unit, earthed system and microphone；Wherein：
By power subsystem working power is provided for whole intercom；
Microprocessor is communicatively coupled with RDA1846S radio frequency chips；Display unit is connected to the corresponding defeated of microprocessor
Go out end；The tuning control output end of microprocessor is respectively connecting to the corresponding of VHF selective frequency amplifier circuits and UHF selective frequency amplifier circuits
Control terminal；
Put by the antenna port, VHF wave filter ＆ impedance matching circuits, VHF radio-frequency switch circuits, VHF frequency-selectings that are sequentially connected
Big circuit, RDA1846S radio frequency chips, audio-frequency power amplifier unit and loudspeaker form VHF signal receiving channel；
Put by the antenna port, UHF wave filter ＆ impedance matching circuits, UHF radio-frequency switch circuits, UHF frequency-selectings that are sequentially connected
Big circuit, RDA1846S radio frequency chips, audio-frequency power amplifier unit and loudspeaker form UHF signal receiving channels；
By be sequentially connected the mono- power tube common radio-frequency amplifying circuit of microphone, RDA1846S radio frequency chips, UHF＆VHF,
VHF radio-frequency switch circuits, VHF wave filter ＆ impedance matching circuits and antenna port form VHF signal transmission channel；
By be sequentially connected the mono- power tube common radio-frequency amplifying circuit of microphone, RDA1846S radio frequency chips, UHF＆VHF,
UHF radio-frequency switch circuits, UHF wave filter ＆ impedance matching circuits and antenna port form UHF signal transmission channels.
The circuit part of host circuit is reserved with numeral and expands unit, and numeral expands unit and carries out communication link with microprocessor
Connect, the respective input that numeral expands unit connects the output end of microphone and the audio output of RDA1846S radio frequency chips respectively
End, the reception audio output of numeral expansion unit are connected to the audio input end of audio-frequency power amplifier unit, and numeral is expanded
The transmitting audio output of unit is connected to the audio input end of RDA1846S radio frequency chips by an outer clock circuit.
VHF selective frequency amplifier circuits, UHF selective frequency amplifier circuits are using the amplifying circuit with varactor tuning frequency-selecting.
The both positive and negative polarity input of power subsystem has gone here and there two plug-in unit magnetic cores respectively.
After adopting the above technical scheme, the present invention has the advantages that：
1st, using RDA1846S radio frequency chips, it is high complete of a kind of small volume, integrated level height, stable performance, uniformity
Whole FM radio-frequency systems, reaching reduces system complexity, production difficulty, improves the stability of a system, reliability.
2nd, realize that two-way broadband, high performance UHF and VHF radio-frequency powers amplify electricity using single radio frequency power amplifier tube
Road, discrete device is reduced to greatest extent, effectively reducing cost, (Vehicular intercom power tube is core devices, and price is complete machine
Middle cost highest device), so as to reach simplified circuit, reduce cost.
3rd, using isolation control circuit is increased in radio-frequency switch circuit, for solving double frequency Vehicular intercom using single
Antenna port radio frequency exports Out-of-band rejection ability problem during radio-frequency power amplifier tube.
4th, VHF selective frequency amplifier circuits and UHF selective frequency amplifier circuits use the amplifying circuit with varactor tuning frequency-selecting, can
Reach and filter out, suppress out-of-band interference signal, lifting RDA1846S radio frequency chips receive antijamming capability.
5th, the vehicle-mounted intercommunication of double frequency uses building block design, reserves numeral and expands unit, can expand DPMR, DMR numeral work(
Energy.
6th, the both positive and negative polarity input of power subsystem has gone here and there two high-quality plug-in unit magnetic cores respectively, can suppress various radio frequencies and do
Disturb.
Brief description of the drawings
Fig. 1 is the circuitry theory diagram of the present invention；
Fig. 2 is the internal frame diagram of RDA1846S radio frequency chips；
Fig. 3 is the theory diagram of emitting portion in the present invention；
Fig. 4 is the theory diagram of receiving portion in the present invention；
Fig. 5 is the local circuit theory diagram of power subsystem in the present invention；
Fig. 6 is the top view (being covered in omission) of main frame in the present invention；
Fig. 7 is the present invention master actually measured applied to the AT778UV double frequency Vehicular intercoms of Qi Xiang electronics corporations design
Want index.
Embodiment
A kind of double frequency Vehicular intercom of the present invention, including main frame and hand-held microphone, microphone is provided with hand-held microphone；Such as Fig. 6 institutes
Show, main frame 100, which includes aluminum alloy casing 101 and the host circuit being arranged in aluminum alloy casing 101, the host circuit, to be included
Pcb board 102 and the circuit part being arranged on pcb board 102.
As shown in figure 1, the circuit part of host circuit includes antenna port 1, VHF wave filter ＆ impedance matching circuits 2, UHF
Wave filter ＆ impedance matching circuits 3, VHF radio-frequency switch circuits 4, UHF radio-frequency switch circuits 5, VHF selective frequency amplifier circuits 6, UHF choosings
The mono- power tube common radio-frequency amplifying circuit 9 of frequency amplifying circuit 7, UHF＆VHF, RDA1846S radio frequency chips 10, Audio power amplifier
Device unit 12, microprocessor 13, display unit 14, power subsystem 15, earthed system 16, loudspeaker 17 and microphone 18.
By power subsystem 15 working power is provided for whole intercom；
Microprocessor 13 and RDA1846S radio frequency chips 10 are communicatively coupled；Display unit 14 is connected to microprocessor 13
Corresponding output end；The tuning control output end of microprocessor 13 is respectively connecting to VHF selective frequency amplifier circuits 6 and UHF frequency-selectings are put
The corresponding controling end of big circuit 7；
Selected by the antenna port 1, VHF wave filter ＆ impedance matching circuits 2, VHF radio-frequency switch circuits 4, the VHF that are sequentially connected
Frequency amplifying circuit 6, RDA1846S radio frequency chips 10, audio-frequency power amplifier unit 12 and loudspeaker 17 form VHF signal and received
Passage；
Selected by the antenna port 1, UHF wave filter ＆ impedance matching circuits 3, UHF radio-frequency switch circuits 5, the UHF that are sequentially connected
Frequency amplifying circuit 7, RDA1846S radio frequency chips 10, audio-frequency power amplifier unit 12 and loudspeaker 17 form UHF signals and received
Passage；
By the mono- power tube common radio-frequency amplification electricity of the microphone 18, RDA1846S radio frequency chips 10, UHF＆VHF that are sequentially connected
Road 9, VHF radio-frequency switch circuits 4, VHF wave filter ＆ impedance matching circuits 2 and antenna port 1 form VHF signal transmission channel；
By the mono- power tube common radio-frequency amplification electricity of the microphone 18, RDA1846S radio frequency chips 10, UHF＆VHF that are sequentially connected
Road 9, UHF radio-frequency switch circuits 5, UHF wave filter ＆ impedance matching circuits 3 and antenna port 1 form UHF signal transmission channels.
In order to expand DPMR, DMR digital functions, the present invention uses building block design, and the circuit part of host circuit is reserved
There is numeral to expand unit 19, numeral is expanded unit 19 and is communicatively coupled with microprocessor 13, and numeral expands the corresponding of unit 19
Input connects the output end of microphone 18 and the audio output of RDA1846S radio frequency chips 10 respectively, and numeral expands unit 19
Reception audio output be connected to the audio input end of audio-frequency power amplifier unit 12, numeral expands the transmitting sound of unit 19
Frequency output end is connected to the audio input end of RDA1846S radio frequency chips 10 by an outer clock circuit 11.
As shown in Figure 1, Figure 3, diode D7, triode Q9, inductance L55, inductance L6 and diode D2 form UHF radio frequencies and opened
Powered-down road 5；Diode D6, inductance L11 and diode D1 form VHF radio-frequency switch circuits 4；Radio frequency power tube Q1, inductance L9, two
Pole pipe D31, diode D3, inductance L12, UHF impedance matching circuit one, by UHF impedance matching circuits two and VHF impedance matchings electricity
Road one forms the mono- power tube common radio-frequency amplifying circuits 9 of UHF＆VHF.
In the present invention, the isolation control circuit that is made up of diode D31, diode D3, inductance L9 and inductance L12 is used for
Solve the problems, such as that antenna port radio frequency exports Out-of-band rejection ability when double frequency Vehicular intercom uses single radio frequency power amplifier tube.
In the present invention, each UHF impedance matching circuits, each VHF impedance matching circuits and UHF/VHF impedance matching circuits are equal
The known features formed using conventional devices such as the resistance capacitance inductance by routine.
The prime radio frequency amplifying circuit that triode Q7 and related necessary device are formed, FET Q6 and related necessity
The promotion amplifying circuit that the pre- promotion amplifying circuit that device is formed, FET Q2 and related necessary device are formed, it is above-mentioned several
The individual necessary device of correlation refers both to form the necessary device needed for corresponding amplifying circuit according to the common knowledge of this area.
By prime radio frequency amplifying circuit, in advance promote amplifying circuit, promote amplifying circuit and UHF impedance matching circuits three,
VHF impedance matching circuits two, UHF/VHF impedance matching circuits, diode D34, diode D5, diode D4, diode D33,
The rf signal amplification circuit that diode D32, inductance L22, inductance L21, inductance L50, electric capacity C51 and electric capacity C224 are formed is
The mono- power tube common radio-frequency amplifying circuits 19 of UHF＆VHF provide enough power.
As Figure 1 and Figure 4, by high-frequency amplifier Q4, UHF tunable bandpass filters one, UHF tunable band-pass filterings
Device two, varactor D25, varactor D26, varactor D27, varactor D28, buffer amplifier U2 and micro-
Processor U312 (13 in Fig. 1) forms UHF selective frequency amplifier circuits 7.By high-frequency amplifier Q3, VHF tunable bandpass filters
First, VHF tunable bandpass filters two, varactor D8, varactor D9, varactor D23, varactor
D24, buffer amplifier U2, microprocessor U312 (13 in Fig. 1) form VHF selective frequency amplifier circuits 6.
Acceptance division：The single RDA1846S radio frequency chips of use of the invention are as Vehicular intercom solution master
Chip.It is the amplifying circuit with varactor tuning frequency-selecting in the present invention, before and after the high-frequency amplifier of receiving circuit, can be effective
Various interference electric waves are filtered out, anti-interference is improved, improves the deficiency of single-chip, it is specific as follows：
As Figure 1 and Figure 4, the VHF reception signals inputted from antenna port 1 pass through VHF wave filter ＆ impedance matching circuits
2, the VHF radio-frequency switch circuits 4 (D1 and D6) then formed via diode enter VHF selective frequency amplifier circuits 6, and VHF frequency-selectings are put
Big circuit 6 is the amplifying circuit with varactor tuning frequency-selecting, tunable by VHF by the signal of VHF radio-frequency switch circuits 4
Bandpass filter two, and amplified by high-frequency amplifier Q3.This signal passes through VHF tunable bandpass filters one, Ran Houjing again
RDA1846S radio frequency chips 10 are entered by VHF RF signal switch diodes D11.VHF tunable bandpass filters one and VHF can
Tunable bandpass filter two is adjusted by varactor D8, D9, D23 and D24, inputs the voltage of varactor by through microprocessor
The voltage output adjustment of device (U312) 13；
As Figure 1 and Figure 4, the UHF reception signals inputted from antenna port 1 pass through UHF wave filter ＆ impedance matching circuits
3, the UHF radio-frequency switch circuits 5 (D2 and D7) then formed via diode enter UHF selective frequency amplifier circuits 7, and UHF frequency-selectings are put
Big circuit 7 is the amplifying circuit with varactor tuning frequency-selecting, tunable by UHF by the signal of UHF radio-frequency switch circuits 5
Bandpass filter two, and amplified by high-frequency amplifier Q4.This signal passes through UHF tunable bandpass filters one, Ran Houjing again
RDA1846S radio frequency chips 10 are entered by UHF RF signal switch diodes D10.UHF tunable bandpass filters one and UHF can
Tunable bandpass filter two is adjusted by varactor D25, D26, D27 and D28, inputs the voltage of varactor by through micro- place
Manage the voltage output adjustment of device (U312) 13；
As shown in Figure 1 and Figure 2, VHF or UHF reception radiofrequency signal is inputted by the radio frequency of RDA1846S radio frequency chips 10
Port (RFIN) enters RDA1846S radio frequency chips 10.Pass through the low-noise amplifier inside RDA1846S radio frequency chips 10, I/Q
Variable gain amplifier, I/Q analog-digital converters, digital signal processor complete the demodulation to radiofrequency signal, finally by D/A
Converter produces audio signal and exported via the audio output port (AFOUT) of RDA1846S radio frequency chips 10.The sound of output
Frequency signal is amplified by audio-frequency power amplifier unit 12, drive the speaker 17.
Emission part：The present invention realizes that two-way broadband, high performance UHF and VHF are sent out using single radio frequency power amplifier tube
Element circuit is penetrated, reduces the high radio frequency power tube one of cost and unclassified stores category, reduces cost, while and can meets
Harmonics restraint index request needed for European standard, it is specific as follows：
As shown in Figure 1 and Figure 2, by the audio signal of microphone 18 be amplified amplitude limit and frequency deviation control after pass through by
The audio input port (MIC) of RDA1846S radio frequency chips 10 enters RDA1846S radio frequency chips 10.Entered by analog-digital converter
Enter digital signal processor into frequency modulation(PFM) is carried out in VCO, radio-frequency carrier signal caused by modulation is amplified by power-adjustable
Device amplifies and exported via the radio frequency output port (RFOUT) of RDA1846S radio frequency chips 10；
As shown in Figure 1, Figure 3, the radiofrequency signal exported by RDA1846S radio frequency chips 10 enters prime radio frequency amplifying circuit
Preliminary power amplification is carried out, the pumping signal of some strength is provided for rear class amplifying circuit；Radio frequency letter after preliminary amplification
Number entrance promotes amplifying circuit to carry out power amplification again in advance, to promote amplifying circuit to provide the pumping signal of some strength,
To ensure to promote amplifying circuit to export enough power.
As shown in figure 3, the radiofrequency signal after promotion radio frequency amplifying circuit amplifies again in advance, which enters, promotes amplifying circuit.Due to
Through promotion amplifying circuit amplification power reached nearly 1W power, so output impedance matching power is begun with it is bright
Aobvious influence, for the power stability of full frequency band, the present invention exports resistance in the UHF for promoting amplification circuit output end introducing independent
Anti- match circuit three and VHF output impedances match circuit two, at the same it is steady by the independent UHF of switching diode D33 and D34 composition
Determine circuit and VHF stabilizing circuits, and by switching diode D4 and D5 control selections using UHF output impedances match circuit three or
VHF output impedances match circuit two.Simultaneously in order to strengthen isolation, opened what control UHF output impedances match circuit three exported
The negative pole for closing diode D5 introduces VHF emitting voltage by inductance L50, realizes good reverse isolation.Radiofrequency signal afterwards
Public UHF/VHF impedance matching circuits are entered, VHF radio circuits are strengthened by switching diode D32 in this link
Stability.
As shown in figure 3, the radiofrequency signal after promoting amplifying circuit amplification enters radio frequency power tube Q1.Radio frequency power tube
Q1 power output is larger, and influence of the impedance matching to power is very big, so the impedance matching of final stage output is quite heavy
Will.The present invention uses independent UHF output impedances match circuit two and VHF output impedances match circuit one.VHF radiofrequency signals pass through
Cross VHF output impedances match circuit one enter VHF radio-frequency switch circuits 4 again after VHF wave filter ＆ impedance matching circuits 2 from
Antenna port 1 is launched, and VHF radio-frequency switch circuits 4 are made up of two diodes D1 and D6, are effectively subtracted using reverse isolation
The leakage of reception signal or transmission signal to other side is lacked；And sealed among the UHF final stage output impedance match circuits of the present invention
Two switching diodes D3 and D31, while the negative pole of the switching diode D2 in UHF transceiving radio frequencies on-off circuit 5 is by electricity
Feel the emitting voltage that L6 and L55 introduce VHF, realize good reverse isolation, effectively prevent VHF radio frequencies spurious signal from
UHF circuits leak out, and improve the transmitting harmonic wave antijamming capability of the present invention.UHF radiofrequency signals match by UHF output impedances
Circuit one enters UHF radio-frequency switch circuits 5 and launched again after UHF wave filter ＆ impedance matching circuits 3 from antenna port 1,
UHF radio-frequency switch circuits 5 are made up of two diodes D2 and D7, and reception signal or transmitting are effectively reduced using reverse isolation
Leakage of the signal to other side.
As shown in Figure 5, Figure 6, the both positive and negative polarity input of power subsystem 15 has gone here and there two high-quality plug-in unit magnetic core 1a respectively
(L301, L304, L302 and L303).The AT778UV Vehicular intercoms that plug-in unit magnetic core 1a specification is designed with Qi Xiang electronics corporations
Exemplified by, used plug-in unit magnetic core 1a sizes are L7.5mm x W2.3mm x H5.5mm, and magnetic core magnetic flux is big, to high-frequency electromagnetic
Interference has a good inhibiting effect, and the present invention has gone here and there two high-quality plug-in unit magnetic core 1a respectively in both positive and negative polarity input, can be effective
Prevent various electromagnetic interference signals to be transmitted to Vehicular intercom by power line and disturb its normal work, realize and effectively suppress each
Kind high-frequency electromagnetic interference.
The present invention leading indicator actually measured applied to the AT778UV double frequency Vehicular intercoms of Qi Xiang electronics corporations design
As shown in Figure 7.
In the present invention, RDA1846S radio frequency chips 10 can also be substituted using BK4815 radio frequency chips, but software and
Hardware needs suitably to be adjusted.
Claims (4)
- A kind of 1. two-band Vehicular intercom, it is characterised in that：Including host circuit and hand-held microphone, microphone is provided with hand-held microphone, The circuit part of host circuit include antenna port, VHF wave filter ＆ impedance matching circuits, UHF wave filter ＆ impedance matching circuits, The mono- power tube common radio-frequency amplifying circuits of UHF＆VHF, VHF radio-frequency switch circuits, UHF radio-frequency switch circuits, VHF frequency-selectings amplification electricity Road, UHF selective frequency amplifier circuits, RDA1846S radio frequency chips, audio-frequency power amplifier unit, loudspeaker, display unit, microprocessor Device, power subsystem, earthed system and microphone；Wherein：By power subsystem working power is provided for whole intercom；Microprocessor is communicatively coupled with RDA1846S radio frequency chips；Display unit is connected to the corresponding output of microprocessor End；The tuning control output end of microprocessor is respectively connecting to the corresponding control of VHF selective frequency amplifier circuits and UHF selective frequency amplifier circuits End processed；By antenna port, VHF wave filter ＆ impedance matching circuits, VHF radio-frequency switch circuits, the VHF frequency-selectings amplification electricity being sequentially connected Road, RDA1846S radio frequency chips, audio-frequency power amplifier unit and loudspeaker form VHF signal receiving channel；By antenna port, UHF wave filter ＆ impedance matching circuits, UHF radio-frequency switch circuits, the UHF frequency-selectings amplification electricity being sequentially connected Road, RDA1846S radio frequency chips, audio-frequency power amplifier unit and loudspeaker form UHF signal receiving channels；Penetrated by the mono- power tube common radio-frequency amplifying circuit of microphone, RDA1846S radio frequency chips, UHF＆VHF, the VHF that are sequentially connected Frequency switching circuit, VHF wave filter ＆ impedance matching circuits and antenna port form VHF signal transmission channel；Penetrated by the mono- power tube common radio-frequency amplifying circuit of microphone, RDA1846S radio frequency chips, UHF＆VHF, the UHF that are sequentially connected Frequency switching circuit, UHF wave filter ＆ impedance matching circuits and antenna port form UHF signal transmission channels.
- A kind of 2. two-band Vehicular intercom according to claim 1, it is characterised in that：The circuit part of host circuit is reserved There is numeral to expand unit, numeral is expanded unit and is communicatively coupled with microprocessor, and numeral expands the respective input point of unit Not Lian Jie the output end of microphone and the audio output of RDA1846S radio frequency chips, numeral expand unit reception audio output End is connected to the audio input end of audio-frequency power amplifier unit, and numeral expands the transmitting audio output of unit by outside one Clock circuit is connected to the audio input end of RDA1846S radio frequency chips.
- A kind of 3. two-band Vehicular intercom according to claim 1, it is characterised in that：VHF selective frequency amplifier circuits, UHF choosings Frequency amplifying circuit is using the amplifying circuit with varactor tuning frequency-selecting.
- A kind of 4. two-band Vehicular intercom according to claim 1, it is characterised in that：The both positive and negative polarity input of power subsystem Two plug-in unit magnetic cores are gone here and there respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711160524.7A CN107786226B (en) | 2017-11-20 | 2017-11-20 | Dual-frequency vehicle-mounted interphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711160524.7A CN107786226B (en) | 2017-11-20 | 2017-11-20 | Dual-frequency vehicle-mounted interphone |
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| Publication Number | Publication Date |
|---|---|
| CN107786226A true CN107786226A (en) | 2018-03-09 |
| CN107786226B CN107786226B (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711160524.7A Active CN107786226B (en) | 2017-11-20 | 2017-11-20 | Dual-frequency vehicle-mounted interphone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212932A (en) * | 2019-06-12 | 2019-09-06 | 湖北省特力讯电子科技有限公司 | A kind of automobile double frequency high-power transmission signal system |
| CN110311699A (en) * | 2019-07-29 | 2019-10-08 | 广东宽普科技股份有限公司 | A kind of radio-frequency receiving-transmitting component for vehicle-carrying communication |
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