CN203984419U - A kind of improved vehicle-carried intercom - Google Patents
A kind of improved vehicle-carried intercom Download PDFInfo
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- CN203984419U CN203984419U CN201420332628.7U CN201420332628U CN203984419U CN 203984419 U CN203984419 U CN 203984419U CN 201420332628 U CN201420332628 U CN 201420332628U CN 203984419 U CN203984419 U CN 203984419U
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Abstract
The utility model discloses a kind of antijamming capability strong, the improved vehicle-carried intercom that reliability is high, performance is remarkable, it comprises main frame and hand miaow, main frame comprises aluminum alloy casing and is arranged at the host circuit in aluminum alloy casing; Host circuit comprises pcb board and be arranged at the circuit part on pcb board, and circuit part comprises antenna port, low pass filter, transmitting-receiving radio-frequency (RF) switch, transmitter unit, receiving element, VCO and PLL frequency synthesizer unit, audio frequency and Signaling Processing Unit, audio-frequency power amplifier unit, loud speaker, APC automated power control unit, display unit, microprocessor, D/A processor, power subsystem and grounding system.The utility model adopts multiple electromagnetic shielding and suppresses radio frequency interference measure in power input line, antenna adapter, loud speaker etc.; can effectively reduce the impact of various electromagnetic interference on Vehicular intercom on automobile; reduce the impact of various radio frequency interference, and there is the function such as overvoltage protection, temperature control protection.
Description
Technical field
The utility model relates to Vehicular intercom, and what be specifically related to is that a kind of antijamming capability is strong, the improved vehicle-carried intercom that reliability is high, performance is remarkable.
Background technology
Vehicular intercom distance, networking applications distances is farther, is therefore widely used in multiple industries such as communications and transportation, community service industry, disaster relief and rescue, forest fire protection, emergency communication, is a kind of important wireless communication facility.
Electromagnetic environment complexity on automobile, greatly affected serviceability and the experience of Vehicular intercom, and the electromagnetic environment of different automobiles is also not quite similar.Electromagnetic interference generally comprises the interference signal that automobile engine produces, the interference signal that electronic equipment on automobile produces, the signal that the less radio-frequency that Vehicular intercom sends out by antenna terminal feeds back, and the external interference signals coming from power input line conduction, various interference signals are transmitted to Vehicular intercom through power input line and disturb it normally to work above, produce unnecessary noise; The Radio Frequency Interfere that Vehicular intercom self produces in addition also can conduct the normal work of disturbing the electronic equipment on automobile through power input line.
Existing Vehicular intercom automobile power source input electromagnetic interference suppresses, conventionally the both positive and negative polarity end of receiving on circuit board at power input line carries out, on circuit board, on the cabling of both positive and negative polarity input, be connected in series magnetic bead, but magnetic bead is because its size has limited magnetic flux size, thorough not for High-frequency Interference inhibition, cause Vehicular intercom is still disturbed.
The radio-frequency power of Vehicular intercom is large, very easily cause the circuit of various radio frequency interference self, particularly, in the time of antenna mismatch, in actual use, antenna damage mismatch causes reflection power large, disturbs Vehicular intercom and the situation of damaging final stage power tube often to have generation.
Vehicle power supply voltage fluctuation is larger, often the too high Vehicular intercom that causes of power input voltage damages, the rated voltage of Vehicular intercom is 13.8V, and the battery voltage of truck is 24V, while often occurring being used in truck, do not do the step-down of 24V to 13.8V, directly 24V is connected on to Vehicular intercom and causes that Vehicular intercom burns out.
Utility model content
The purpose of this utility model is to provide a kind of improved vehicle-carried intercom, and it can effectively reduce various electromagnetic interference and radio frequency interference on automobile, ensures that call between Vehicular intercom is clear and optimizes various radio-frequency (RF) index.
Another object of the present utility model is to provide a kind of improved vehicle-carried intercom, and it can effectively improve the dependable with function of Vehicular intercom, improves user satisfaction.
To achieve these goals, the utility model adopts following technical scheme:
A kind of improved vehicle-carried intercom, comprises main frame and hand miaow, and described main frame comprises aluminum alloy casing and is arranged at the host circuit in aluminum alloy casing; Described host circuit comprises pcb board and be arranged at the circuit part on pcb board, and circuit part comprises antenna port, low pass filter, transmitting-receiving radio-frequency (RF) switch, transmitter unit, receiving element, VCO and PLL frequency synthesizer unit, audio frequency and Signaling Processing Unit, audio-frequency power amplifier unit, loud speaker, APC automated power control unit, display unit, microprocessor, D/A processor, power subsystem and grounding system;
In the positive and negative power supply input line of described power subsystem, be coated with respectively at least two ferrite beads;
Described antenna port has antenna adapter, on described aluminum alloy casing, offers installing hole, and described antenna adapter is arranged in this installing hole and by a ring flange and coordinates screwed lock on described aluminum alloy casing; One end that described antenna adapter stretches in described aluminum alloy casing is arranged with ground sleeve, this ground sleeve has two ground strips, these two ground strips be divided into described antenna adapter respective ends both sides and respectively by screwed lock on circuit board earth mat Copper Foil, a grounding pin and described ground sleeve on described antenna adapter weld together, and circuit board earth mat Copper Foil is by the described grounding pin of described ground sleeve, described antenna adapter, described ring flange and be connected formation with described aluminum alloy casing altogether for locking the screw of described ring flange;
On described loud speaker, be coated with Anti-magnetic cap;
The input of described APC automated power control unit is connected in the signal feedback end of described low pass filter, the output of described APC automated power control unit is connected to the control end of transmitter unit, and the output of described microprocessor is connected to the control end of described APC automated power control unit through described D/A converter.
Described transmitter unit has the power tube of promotion and final stage power amplifier tube, all good earths on described pcb board of described promotion power tube, described final stage power amplifier tube and described VCO and PLL frequency synthesizer unit; And on described promotion power tube, be covered with screening cover, on described final stage power amplifier tube, be covered with the silver-plated upper cover of fine copper; VCO circuit part in described VCO and PLL frequency synthesizer unit is arranged with mask frame outward, is covered with radome on it.
Described transmitting-receiving radio-frequency (RF) switch adopts Toshiba's high-performance radio-frequency switching diode, and model is JDP2S12CR.
The circuit part of described host circuit also comprises temperature control protected location; described temperature control protected location has negative temperature coefficient resister and heat conduction temperature-control circuit; described negative temperature coefficient resister is installed on the position of the final stage power amplifier tube of close described transmitter unit on described pcb board; described negative temperature coefficient resister is connected in the input of described heat conduction temperature-control circuit, and the output of described heat conduction temperature-control circuit is connected to the control end of described APC automated power control unit.
LCD back lighting drive circuit in described display unit adopts constant-current drive circuit.
Described power subsystem after two-stage voltage stabilizing for described microprocessor provides working power; And the voltage detecting input of described microprocessor is connected with voltage detecting circuit, the power supply control output end of described microprocessor is connected with the switching circuit of the complete machine electric power loop that is switched on or switched off described power subsystem.
The keyboard lockout switch of described hand miaow and DTMF locking switch all adopt mechanical switch and are all arranged at the front of described hand miaow.
The PTT button of described hand miaow comprises PTT key shell and flexure strip, described PTT key shell has the fore-set of the emission switch that stretches into described hand miaow inside corresponding described hand miaow, one end of described flexure strip is fixed in described hand miaow, and the other end is free end corresponding being stretched between described fore-set and the emission switch of described hand miaow; In one end of described PTT key shell along with the corresponding setting in edge of described pcb board corresponding site, and leave the spacing gap of controlling described PTT key shell pressing quantity between the two.
Between the interior edge of described PTT key shell and the respective side edge of described pcb board edge, be folded with the spacing pad of elastic buffer.
Adopt after such scheme, the follow-on Vehicular intercom of the utility model, by being coated with respectively at least two ferrite beads in the positive and negative power supply input line at power subsystem, its magnetic flux is large, high-frequency electromagnetic is disturbed and has good inhibitory action, the effectively various high-frequency electromagnetic interference sound of coming from the conduction of automobile power source input line of filtering, actual use be can't hear the interference sound transmitting from automobile engine etc. substantially; And, in the utility model, antenna adapter is carried out to effective grounding, can suppress well radio frequency interference, ensure that the call between Vehicular intercom is clear; The utility model is coated with Anti-magnetic cap on loud speaker, by basic whole loud speaker closed shield, effectively prevents the work of influence of magnetic field Vehicular intercom and the overall performance of loudspeaker.APC automatic power control circuitry in the utility model can be protected Vehicular intercom in the situation that power changes particularly antenna mismatch, reduces radio frequency interference.Owing to adopting above-mentioned electromagnetic shielding and suppressing radio frequency interference measure, improved vehicle-carried intercommunication function of the present utility model is well applicable to the electromagnetic environment of various complexity and suppresses radio frequency interference, ensures that call between Vehicular intercom is clear and optimizes various radio-frequency (RF) index.
In the utility model, promote power tube, final stage power amplifier tube and VCO and all good earths on pcb board of PLL frequency synthesizer unit; And be covered with radiating shield case on promotion power tube, the end face of final stage power amplifier tube is covered with the silver-plated radiating shield case of fine copper, VCO circuit part in VCO and PLL frequency synthesizer unit is arranged with mask frame outward, on it, be covered with radome, further suppress better various electromagnetism and radio frequency interference.
In the utility model, transmitting-receiving radio-frequency (RF) switch adopts Toshiba's high-performance radio-frequency switching diode, and model is JDP2S12CR.This radio-frequency (RF) switch diode has extremely low radio frequency conducting resistance, low reflection electric capacity and high-isolation, has greatly promoted the radio-frequency performance of Vehicular intercom.
In the utility model, host circuit is provided with temperature control protected location, and it can effectively control the temperature of Vehicular intercom, avoids overheated and causes that Vehicular intercom damages, and improves reliability and the useful life of Vehicular intercom.
In existing Vehicular intercom, the LCD back lighting drive circuit in display unit adopts constant voltage mode to drive, and backlight illumination can not regulate controlled.In the utility model, LCD back lighting drive circuit in display unit adopts constant-current drive circuit, backlight illumination controlled variable and current constant mode drives advantage backlight, the poor impact of device consistency is little, ensure good even back degree, and can improve useful life and the reliability of device, be easy to see clearly upper frequency and the machine work at present state showing of LCD.
In the utility model, power subsystem for microprocessor provides working power, effectively prevents that instantaneous pressure from damaging microprocessor, improves the reliability and stability of complete machine after two-stage voltage stabilizing.And the voltage detecting input of microprocessor is connected with voltage detecting circuit, the power supply control output end of microprocessor is connected with the switching circuit of the complete machine electric power loop that is switched on or switched off power subsystem.In the time that input supply voltage is too high, overvoltage protection, by the power supply of the complete machine electric power loop of deenergization unit, is realized in the power supply control output end of microprocessor, while ensureing Vehicular intercom input too high voltages, does not damage, and has promoted reliability.
In the utility model, the keyboard lockout switch of hand miaow and DTMF locking switch all adopt mechanical switch and are all arranged at the front of hand miaow, and driver is easy to identify the current operating state of hand miaow, effectively ensures not misoperation of keyboard and driving safety.
In the utility model, PTT press-key structure adopts PTT key shell and flexure strip to coordinate, and in one end of PTT key shell along and the edge of described pcb board corresponding site between leave spacing gap, make that PTT button operation comfortableness is good, good springiness, reliability be high.Further, between the interior edge of PTT key shell and the respective side edge of described pcb board edge, be folded with the spacing pad of elastic buffer, improved especially PTT button operation comfortableness, elasticity and reliability.
Brief description of the drawings
Fig. 1 is circuitry theory diagram of the present utility model;
Fig. 2 is the schematic block circuit diagram of display unit in Fig. 1;
Fig. 3 is the physical circuit figure of the back lighting constant-current drive circuit in display unit in Fig. 2;
Fig. 4 is the local circuit theory diagram of power subsystem in Fig. 1;
Fig. 5 is the physical circuit figure of Fig. 4;
Fig. 6 is the vertical view (omission upper cover) of main frame in the utility model;
Fig. 7 is the vertical view (omitting upper cover and circuit board) of main frame in the utility model;
Fig. 8 is the rearview of main frame in the utility model;
Fig. 9 is the Facad structure schematic diagram of hand miaow in the utility model;
Figure 10 is the structural representation of the PPT button of hand miaow in the utility model.
Embodiment
A kind of improved vehicle-carried intercom of the present utility model, comprise main frame 100 and hand miaow 200, as shown in Figure 6, Figure 7, described main frame comprises aluminum alloy casing 101 and is arranged at the host circuit in aluminum alloy casing 101, and described host circuit comprises pcb board 102 and is arranged at the circuit part on pcb board 102.As shown in Figure 1, the circuit part of host circuit comprises antenna port 1, low pass filter 2, transmitting-receiving radio-frequency (RF) switch 3, receiving element 4, audio frequency and Signaling Processing Unit 5, audio-frequency power amplifier unit 6, loud speaker 7, APC automated power control unit 8, transmitter unit 9, VCO and PLL frequency synthesizer unit 10, microprocessor 11, display unit 12, D/A converter 13, power subsystem 14, grounding system 15 and temperature control protected location 16.As shown in Figure 9, Figure 10, hand miaow 200 comprises shell 201 and is arranged at the hand miaow circuit in shell 201, and hand miaow circuit comprises pcb board 202 and is arranged at the circuit part on pcb board 202.As shown in Figure 1, the circuit part of hand miaow circuit comprises hand miaow unit 17 and microphone 18.
In the utility model, the known technology that the basic circuit framework of host circuit and hand miaow circuit is this area, does not do detailed expansion at this.Main improvement of the present utility model is the details improvement that each parts of Vehicular intercom are carried out, to improve the performance of Vehicular intercom.Specific as follows:
As shown in Fig. 4, Fig. 5, Fig. 6, in the positive and negative power supply input line of power subsystem 14, be coated with respectively at least two high-quality ferrite beads 141.The specification of ferrite bead is taking 588 Vehicular intercoms as example, and the ferrite bead size adopting is 4mm in the outer 8mm x D of H8mm x D, will be according to actual interference situation adjustment for quantity and the size of different Vehicular intercom ferrite beads.Ferrite bead magnetic flux is large, high-frequency electromagnetic is disturbed and has good inhibitory action, the utility model is all at least coated with the ferrite bead of 2 high-qualitys in anodal and negative power supply input line, can effectively prevent that various electromagnetic interference signals are transmitted to Vehicular intercom and are disturbed its normal work by power line, realize and effectively suppress various high-frequency electromagnetics and disturb.
Antenna port 1 has antenna adapter, as shown in Fig. 6, Fig. 7, Fig. 8, on aluminum alloy casing 101, offers installing hole, and antenna adapter 1a is arranged in this installing hole and by a ring flange 1b and coordinates screwed lock on described aluminum alloy casing 101.One end that antenna adapter 1a stretches in described aluminum alloy casing 101 is arranged with ground sleeve 1c, this ground sleeve 1c has two ground strip 1d, 1e, two brace 1d, the respective ends of 1e links together by the connecting portion being connected with both one, this connecting portion is centered around outside the respective ends of antenna adapter 1a, two ground strip 1d, 1e be divided into described antenna adapter 1a respective ends both sides and respectively by screwed lock in circuit board earth mat Copper Foil (not shown), a grounding pin 1f and described ground sleeve 1c on described antenna adapter 1a weld together, circuit board earth mat Copper Foil is by ground sleeve 1c, grounding pin 1f, ring flange 1b and for the screw of latching flange dish 1b be connected with described aluminum alloy casing 101 form altogether.
On loud speaker 7, be coated with Anti-magnetic cap 71, by the basic closed shield of whole loud speaker 7, effectively prevent the work of influence of magnetic field Vehicular intercom and the overall performance of loud speaker 7.
The input of APC automated power control unit 8 is connected in the signal feedback end of low pass filter 2, the output of described APC automated power control unit 8 is connected to the control end of transmitter unit, and the output of described microprocessor 11 is connected to the control end of described APC automated power control unit 8 through D/A converter 13.The power variation that APC automated power control unit 8 is exported by detecting the not stage power amplifier of transmitter unit 9; and generate corresponding voltage; feeding back to automated power control unit 8 compares with the reference voltage of changing from microprocessor 11 and through D/A converter 13; obtain a result and control driving amplifier and the stage power amplifier not of transmitter unit 9; make transmitting keep stable power stage; thereby can in the situation that power changes particularly antenna mismatch, protect Vehicular intercom, reduce radio frequency interference.
Described transmitter unit 9 has the power tube of promotion and final stage power amplifier tube, and described promotion power tube, described final stage power amplifier tube and described VCO and PLL frequency synthesizer unit 10 be good earth on described pcb board 102 all; And as shown in Figure 6, on described promotion power tube, be covered with radiating shield case 9a, the end face of described final stage power amplifier tube is covered with the silver-plated radiating shield case 9b of fine copper; VCO circuit part in described VCO and PLL frequency synthesizer unit is arranged with mask frame outward, is covered with screening cover 10a in mask frame.
Particularly, the bottom surface (source electrode) of described final stage power amplifier tube is attached on the silver-plated ground connection base of a fine copper, end face is covered with the silver-plated radiating shield case 9b of fine copper, on described pcb board 102, offer through hole corresponding to the installation site of described final stage power amplifier tube, this through hole below is fixed with cooling platform, described ground connection base is embedded in described through hole and is stacked and placed on this cooling platform, four angles corresponding to described radiating shield case 9b on described pcb board 102 are respectively arranged with ground pad, four angles of this four grounded pad and described radiating shield case 9b are corresponding respectively to be welded together, when installation, by bolt, radiating shield case 9b, ground connection base and cooling platform are locked together, thereby make the source electrode of final stage power amplifier tube carry out reliable ground by radiating shield case 9b, ground connection base and bolt, realized source electrode and pcb board 102 and formed good earth-return altogether.The source pad of described promotion power tube is directly welded on the ground pad of pcb board 102.
The size shape of mask frame, screening cover 10a and the radiating shield case 9a of VCO circuit part distributes and takes corresponding profile to mate it according to the physical circuit of different Vehicular intercoms.The silver-plated radiating shield case 9b of fine copper mates it according to the profile of corresponding final stage power amplifier tube.
Described promotion power tube, described final stage power amplifier tube and described VCO and PLL frequency synthesizer unit 10 are taked good grounding measures and coordinate electromagnetic shielding, can well suppress various electromagnetism and radio frequency interference, be suitable for the electromagnetic environment of various complexity, ensure that the call between Vehicular intercom is clear.
In the utility model, receive and dispatch radio-frequency (RF) switch 3 and adopt Toshiba's high-performance radio-frequency switching diode, model is JDP2S12CR.This switching diode has extremely low radio frequency conducting resistance, low reflection electric capacity and high-isolation, has greatly promoted the radio-frequency performance of Vehicular intercom.
Microphone 18 adopts independent grounding mode, effectively reduces outside noise and disturbs.
Display unit 12 can determine that to the disturbed condition of display circuit whether on the circuit board earth mat Copper Foil of display unit, increasing multiple grounding elastic parts is pressed onto on aluminum alloy casing according to radio frequency, thereby realize the connection of strengthening display unit circuit earth mat, after increase ground strip, can improve the anti-radio frequency interference ability of display unit circuit.
Temperature control protected location 16 has negative temperature coefficient resister 161 and heat conduction temperature-control circuit 162; described negative temperature coefficient resister 161 is installed on the position of the final stage power amplifier tube of close transmitter unit 9 on described pcb board 102; described negative temperature coefficient resister 161 is connected in the input of described heat conduction temperature-control circuit 162, and the output of described heat conduction temperature-control circuit 162 is connected to the control end of described APC automated power control unit 8.Temperature control protected location 16 can effectively be controlled the temperature of Vehicular intercom, avoids overheated and causes that Vehicular intercom damages, and improves reliability and the useful life of Vehicular intercom.
In existing Vehicular intercom, the LCD illumination driving circuit of display unit adopts constant voltage mode to drive, and backlight illumination can not regulate controlled.As shown in Figure 2 and Figure 3, in the utility model, the LCD illumination driving circuit of display unit 12 adopts constant-current drive circuit, it is backlight illumination controlled variable that current constant mode drives advantage backlight, the poor impact of device consistency is little, ensure good even back degree, and can improve useful life and the reliability of device, be easy to see clearly upper frequency and the machine work at present state showing of LCD.And in employing Fig. 3, circuit LED illuminating color has three kinds of colors optional.LCD liquid crystal display drive circuit U3 adopts Shanghai Belling to control and drive IC BL55076 or BL55077, and this IC adopts bidirectional two-line formula serial bus communication, and driving force is strong, and peripheral components is few.
As shown in Figure 4, Figure 5, described power subsystem 14 after two-stage voltage stabilizing for described microprocessor 11 provides working power.The 5M power supply that offers microprocessor 11 (U2) use is supplied with after by two-stage voltage stabilizing circuit (U1 and D4) voltage stabilizing, in the time of power connection, the power supply of 13.8V input is managed (D4) voltage stabilizing by second 5.6V voltage stabilizing two again through a high voltage bearing 5V three terminal regulator of low-power consumption (U1) voltage stabilizing, prevent that pulsed high pressure from damaging microprocessor, power supply is supplied with microprocessor use after voltage stabilizing, and this 5M power supply keeps normal output always.Microprocessor 11 adopts dual voltage stabilizing (pressurizer U1 and voltage-stabiliser tube D4) protective circuit; effectively prevent that instantaneous pressure from damaging microprocessor; improve the reliability and stability of complete machine; pressurizer U1 selects the high voltage bearing CE6275A50 of low-power consumption or HT7550-1 chip; the high withstand voltage pressurizer shutdown electric current of CE6275A50 or HT7550-1 low-power consumption is less than 10mA, avoids long-time automobile not use on-vehicle battery is exhausted.Power subsystem 14 is also provided with overvoltage protection and detects; the voltage detecting input (P03) of microprocessor U2 is connected with voltage detecting circuit, and the power supply control output end (P20) of microprocessor U2 is connected with the switching circuit (Q103, Q100) of the complete machine electric power loop that is switched on or switched off power subsystem 14.When work; when 16.5V or higher voltage are provided for feed cable; this voltage is by divider resistance R14, R15, R16 dividing potential drop; voltage after dividing potential drop is input to the voltage detecting input of microprocessor U2 through resistance R 13, voltage stabilizing didoe D2 has protection microprocessor voltage detecting input can be because of the too high effect that damages its port of vehicle power supply voltage of input.Whether microprocessor U2 detects the voltage of inputting higher than preset value, too high when judging Vehicular intercom input voltage higher than preset value, the power supply control output end output control signal of microprocessor U2 is closed switching tube Q100, power supply disconnects, the Vehicular intercom work of cannot starting shooting, thereby make in the time that input supply voltage is much higher than rated voltage 13.8V, Vehicular intercom can not produce damage because input voltage is too high, and reliability and stability are better than like product.
As shown in Figure 9, the keyboard lockout switch 203 of hand miaow 200 and DTMF locking switch 204 all adopt mechanical switch to be also all arranged at the front of hand miaow 200.Driver is easy to identify the current operating state of hand miaow, effectively ensures not misoperation of keyboard and driving safety.
As shown in figure 10, the PTT button of hand miaow comprises PTT key shell 205 and elastic steel sheet 206, described PTT key shell 205 has the fore-set 208 of the emission switch 207 that stretches into described hand miaow 200 inside corresponding described hand miaow, the bottom of described elastic steel sheet 206 is one-body molded two installing ring 206a, coordinate screw that the bottom of elastic steel sheet 206 is locked in described hand miaow 200 by these two installing ring 206a, the upper end of elastic steel sheet 206 is free end corresponding being stretched between described fore-set 208 and the emission switch 207 of described hand miaow; In one end of described PTT key shell 205 along with the corresponding setting in edge of described pcb board 202 corresponding sites, and leave the spacing gap 20a that controls described PTT key shell pressing quantity between the two.By said structure make that PTT button operation comfortableness is good, good springiness, reliability be high.And be folded with the spacing pad 209 of elastic buffer between the interior edge of described PTT key shell 205 and the respective side edge of described pcb board 202 edge, improve especially operation comfort, elasticity and the reliability of PTT button.
Claims (9)
1. an improved vehicle-carried intercom, comprises main frame and hand miaow, and described main frame comprises aluminum alloy casing and is arranged at the host circuit in aluminum alloy casing; Described host circuit comprises pcb board and be arranged at the circuit part on pcb board, and circuit part comprises antenna port, low pass filter, transmitting-receiving radio-frequency (RF) switch, transmitter unit, receiving element, VCO and PLL frequency synthesizer unit, audio frequency and Signaling Processing Unit, audio-frequency power amplifier unit, loud speaker, APC automated power control unit, display unit, microprocessor, D/A processor, power subsystem and grounding system; It is characterized in that:
In the positive and negative power supply input line of described power subsystem, be coated with respectively at least two ferrite beads;
Described antenna port has antenna adapter, on described aluminum alloy casing, offers installing hole, and described antenna adapter is arranged in this installing hole and by a ring flange and coordinates screwed lock on described aluminum alloy casing; One end that described antenna adapter stretches in described aluminum alloy casing is arranged with ground sleeve, this ground sleeve has two ground strips, these two ground strips be divided into described antenna adapter respective ends both sides and respectively by screwed lock on circuit board earth mat Copper Foil, a grounding pin and described ground sleeve on described antenna adapter weld together, and circuit board earth mat Copper Foil is by the described grounding pin of described ground sleeve, described antenna adapter, described ring flange and be connected formation with described aluminum alloy casing altogether for locking the screw of described ring flange;
On described loud speaker, be coated with Anti-magnetic cap;
The input of described APC automated power control unit is connected in the signal feedback end of described low pass filter, the output of described APC automated power control unit is connected to the control end of transmitter unit, and the output of described microprocessor is connected to the control end of described APC automated power control unit through described D/A converter.
2. a kind of improved vehicle-carried intercom according to claim 1, it is characterized in that: described transmitter unit has the power tube of promotion and final stage power amplifier tube, all good earths on described pcb board of described promotion power tube, described final stage power amplifier tube and described VCO and PLL frequency synthesizer unit; And on described promotion power tube, be covered with screening cover, on described final stage power amplifier tube, be covered with the silver-plated upper cover of fine copper; VCO circuit part in described VCO and PLL frequency synthesizer unit is arranged with mask frame outward, is covered with radome on it.
3. a kind of improved vehicle-carried intercom according to claim 1, is characterized in that: described transmitting-receiving radio-frequency (RF) switch adopts Toshiba's high-performance radio-frequency switching diode, and model is JDP2S12CR.
4. a kind of improved vehicle-carried intercom according to claim 1, it is characterized in that: the circuit part of described host circuit also comprises temperature control protected location, described temperature control protected location has negative temperature coefficient resister and heat conduction temperature-control circuit, described negative temperature coefficient resister is installed on the position of the final stage power amplifier tube of close described transmitter unit on described pcb board, described negative temperature coefficient resister is connected in the input of described heat conduction temperature-control circuit, the output of described heat conduction temperature-control circuit is connected to the control end of described APC automated power control unit.
5. a kind of improved vehicle-carried intercom according to claim 1, is characterized in that: the LCD back lighting drive circuit in described display unit adopts constant-current drive circuit.
6. a kind of improved vehicle-carried intercom according to claim 1, is characterized in that: described power subsystem after two-stage voltage stabilizing for described microprocessor provides working power; And the voltage detecting input of described microprocessor is connected with voltage detecting circuit, the power supply control output end of described microprocessor is connected with the switching circuit of the complete machine electric power loop that is switched on or switched off described power subsystem.
7. a kind of improved vehicle-carried intercom according to claim 1, is characterized in that: the keyboard lockout switch of described hand miaow and DTMF locking switch all adopt mechanical switch and be all arranged at the front of described hand miaow.
8. a kind of improved vehicle-carried intercom according to claim 1, it is characterized in that: the PTT button of described hand miaow comprises PTT key shell and flexure strip, described PTT key shell has the fore-set of the emission switch that stretches into described hand miaow inside corresponding described hand miaow, one end of described flexure strip is fixed in described hand miaow, and the other end is free end corresponding being stretched between described fore-set and the emission switch of described hand miaow; In one end of described PTT key shell along with the corresponding setting in edge of described pcb board corresponding site, and leave the spacing gap of controlling described PTT key shell pressing quantity between the two.
9. a kind of improved vehicle-carried intercom according to claim 8, is characterized in that: between the interior edge of described PTT key shell and the respective side edge of described pcb board edge, be folded with the spacing pad of elastic buffer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420332628.7U CN203984419U (en) | 2014-06-20 | 2014-06-20 | A kind of improved vehicle-carried intercom |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420332628.7U CN203984419U (en) | 2014-06-20 | 2014-06-20 | A kind of improved vehicle-carried intercom |
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| CN203984419U true CN203984419U (en) | 2014-12-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038248A (en) * | 2014-06-20 | 2014-09-10 | 泉州市琪祥电子科技有限公司 | Improved vehicle-mounted interphone |
| CN106027107A (en) * | 2016-07-26 | 2016-10-12 | 泉州易沃得电子科技有限公司 | DMR digital/analog dual-mode frequency point interphone |
| CN107294554A (en) * | 2017-07-28 | 2017-10-24 | 泉州市琪祥电子科技有限公司 | A kind of single-frequency Vehicular intercom |
-
2014
- 2014-06-20 CN CN201420332628.7U patent/CN203984419U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038248A (en) * | 2014-06-20 | 2014-09-10 | 泉州市琪祥电子科技有限公司 | Improved vehicle-mounted interphone |
| CN106027107A (en) * | 2016-07-26 | 2016-10-12 | 泉州易沃得电子科技有限公司 | DMR digital/analog dual-mode frequency point interphone |
| CN106027107B (en) * | 2016-07-26 | 2018-11-02 | 泉州易沃得电子科技有限公司 | A kind of DMR is digital, simulates double-standard frequency point intercom |
| CN107294554A (en) * | 2017-07-28 | 2017-10-24 | 泉州市琪祥电子科技有限公司 | A kind of single-frequency Vehicular intercom |
| CN107294554B (en) * | 2017-07-28 | 2023-09-12 | 泉州市琪祥电子科技有限公司 | Single-frequency vehicle-mounted interphone |
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