CN1845587A - Vehicle-mounted video antenna - Google Patents
Vehicle-mounted video antenna Download PDFInfo
- Publication number
- CN1845587A CN1845587A CNA200610039247XA CN200610039247A CN1845587A CN 1845587 A CN1845587 A CN 1845587A CN A200610039247X A CNA200610039247X A CN A200610039247XA CN 200610039247 A CN200610039247 A CN 200610039247A CN 1845587 A CN1845587 A CN 1845587A
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Abstract
The disclosed vehicle-carried video antenna comprises an antenna and an antenna amplifier with a shell and an electronic circuit board. Wherein, on the board, it arranges an amplifier with an antenna frequency selection circuit and an amplification circuit and an auto gain control circuit, an antenna joint reed and output interface connected to the vehicle video player; the antenna connects with the amplifier through bridge line, the reed and amplifier. This invention provides sharp view.
Description
Technical field
The present invention relates to a kind of vehicle-mounted video antenna.
Background technology
The automobile video antenna does not have the automatic gain function at present, and each channel gain is close, and when the city signal was strong, it is overlapped that signal amplifies the back image, even negative image occurs, influenced view reception effect.
Summary of the invention
The invention provides a kind of vehicle-mounted video antenna, the multiplication factor of conditioning signal makes the level equalization that offers video machines automatically, the rating clear picture.
Technical scheme of the present invention is as follows: a kind of vehicle-mounted video antenna, it comprises antenna and antenna amplifier antennafire part, antenna amplifier antennafire partly comprises amplifier housing, amplifier electron wiring board, device has amplifier, antenna to connect reed and output interface on the electronic circuit board, antenna connects reed by intercoil connection, antenna and is connected with the amplifier contact, output interface links to each other with the automobile video player, and described amplifier comprises antenna selecting frequency circuit, antenna amplifying circuit and automatic gain control circuit;
Described antenna selecting frequency circuit comprises capacitor C 1, C2, C4, C5, resistance R 1, inductance L 1;
Described antenna amplifying circuit comprises triode V2, resistance R 7, R8, R9, R10, R11, capacitor C 11, C12, C13, C14;
Automatic gain control circuit comprises double diode V3, V4, operational amplifier IC3, triode V1 and electronic attenuator IC1.
Among the present invention, described antenna links to each other with capacitor C 1 in the antenna selecting frequency circuit, capacitor C 1 links to each other with capacitor C 2, capacitor C 4 and inductance L 1 back in parallel are connected in series with capacitor C 5, the output of capacitor C 5 links to each other with the input of electronic attenuator IC1, the output of electronic attenuator IC1 links to each other with triode V2 base stage in the antenna amplifying circuit through capacitor C 8, and the collector electrode of triode V2 links to each other with output interface through capacitor C 23; The positive pole of double diode V4 in the described automatic gain control circuit links to each other with power supply by resistance R 19, the negative pole of double diode V4 links to each other with the positive pole of double diode V3, two negative poles of double diode V3 link to each other with two inputs of operational amplifier IC3 by resistance R 13, R15 respectively, the output of operational amplifier IC3 links to each other with the base biasing resistor R5 of triode V1, the collector electrode of triode V1 links to each other with two control ends of electronic attenuator by resistance R 3, R4 respectively, and electronic attenuator (IC1) is serially connected between antenna selecting frequency circuit and the antenna amplifying circuit.Be connected with the biasing voltage stabilizing circuit between the base stage of triode V2 in the antenna amplifying circuit and the power line, the biasing voltage stabilizing circuit comprises resistance R 7, pressurizer IC2, capacitor C 11.Antenna has the 2-6 root, every antenna all with one independently amplifier link to each other.
Line selection characteristic in sky of the present invention is 47MHZ-870MHZ, and the electric capacity in the frequency selection circuit, resistance, inductance are formed the band pass filter of 47MHZ-870MHZ, and the filtering in parallel of capacitor C 4 and inductance is eliminated interfering frequency, noise reduction.The signal that receives when antenna hour, the electronic attenuator in the automatic gain control circuit is not decayed to the multiplication factor of antenna amplifying circuit, vision signal is delivered to video output interface through capacitor C 23 after being amplified by the triode V2 in the antenna amplifying circuit.After signal that antenna receives reaches certain intensity, the voltage that is transported to operational amplifier IC3 negative pole end through double diode V3 raises, the output impedance of operational amplifier IC3 reduces, PNP triode V1 conducting, and V1 collector plate voltage passes through, R3 is added to RC1-2, R4 is added to IC1-4, and the internal resistance that electronic attenuator IC1 is connected in series with the antenna amplifying circuit increases, and reduces the gain of antenna amplifying circuit automatically, prevent signal overloading, guarantee that clear picture is stable.Be connected with the biasing voltage stabilizing circuit between the base stage of triode V2 and the power line.BCR400W is the V2 voltage stabilizing circuit, size of current by V2 is regulated bias voltage, when the V2 base voltage higher, the collector plate electric current of V2 increases, and electric current flows through through R01 and R11, and the pressure drop of R01 increases, the emitter voltage of Q1 reduces, the base voltage of V2 is reduced, and the collector plate electric current of V2 reduces, up to burning voltage.The present invention is provided with many antennas and links to each other with the signal input interface of television set by amplifier, and the receiving angle difference of many antennas by selecting different antennas, can guarantee that the image that television set receives is the most clear.
Fig. 1 is the circuit theory diagrams of amplifier among the present invention
According to shown in Figure 1, a kind of vehicle-mounted video antenna, it comprises antenna and antenna amplifier antennafire part, antenna amplifier antennafire partly comprises amplifier housing, amplifier electron wiring board, device has amplifier, antenna to connect reed and output interface on the electronic circuit board, antenna connects reed by intercoil connection, antenna and is connected with the amplifier contact, and output interface links to each other with the automobile video player.Described amplifier comprises antenna selecting frequency circuit, antenna amplifying circuit and automatic gain control circuit.
Described antenna selecting frequency circuit comprises capacitor C 1, C2, C4, C5, and resistance R 1, inductance L 1, capacitor C 1 are connected reed and link to each other with antenna, and capacitor C 1, C2 are in series, and is in series with capacitor C 5 after capacitor C 4 and inductance L 1 are in parallel.
Described antenna amplifying circuit comprises triode V2, resistance R 7, R8, R9, R10, R11, capacitor C 11, C12, C13, C14.Be serially connected with the voltage stabilizing biasing circuit between the base stage of triode V2 and the power line, be provided with pressurizer IC2 in the voltage stabilizing biasing circuit, it can adjust the biasing resistor of triode V2 by the size of adjusting output current.The collector electrode of triode V2 links to each other with output interface through capacitor C 23.Triode V2 can select BFG951 for use, and pressurizer IC2 can select BCR400W for use.
Automatic gain control circuit comprises double diode V3, V4, operational amplifier IC3, triode V1 and electronic attenuator IC1.The positive terminal of double diode V4 links to each other with power supply by resistance R 19, and its negative pole end links to each other with the positive terminal of double diode V3, and two negative pole ends of double diode link to each other by two inputs of resistance R 15, R13 and operational amplifier IC3 respectively.The output of operational amplifier IC3 links to each other with the base biasing resistor R5 of triode V1, and the collector electrode of triode V1 links to each other with two control ends of electronic attenuator IC1 by resistance R 3, R4 respectively.The output of electronic attenuator IC1 links to each other with triode V2 by capacitor C 8, and the input of electronic attenuator IC1 links to each other with capacitor C 5.Be serially connected with the low-and high-frequency filter circuit between the electrode input end of the collector electrode of triode V2 and double diode V3, resistance R 16 is composed in series high-frequency filter circuit with capacitor C 17, and resistance R 17 is formed low-frequency filter circuit with capacitor C 18.Two two utmost point V3, V4 can select BAS125-70W for use, and triode V1 is the PNP pipe, selects BC860B for use, and operational amplifier IC3 selects TS321iLT for use, and electronic attenuator IC1 selects BAR61 for use.When the signal that receives when antenna is strong, signal is after triode V2 amplifies, the electrode input end voltage that double diode V3 is serially connected with the height filter circuit raises, the voltage of corresponding cathode output end raises, cause operational amplifier IC3 negative pole end voltage to raise, then operational amplifier IC3 output impedance reduces, and makes PNP triode V1 conducting, electronic attenuator IC1 works, and the signal after frequency-selecting is decayed.
The present invention is provided with many antennas and links to each other with the signal input interface of television set by amplifier, and every antenna is equipped with an amplifier.The receiving angle difference of many antennas by selecting different antennas, can guarantee that the image that television set receives is the most clear.Antenna can use the glass silvering antenna.
Claims (6)
1, a kind of vehicle-mounted video antenna, it comprises antenna and antenna amplifier antennafire part, antenna amplifier antennafire partly comprises amplifier housing, amplifier electron wiring board, device has amplifier, antenna to connect reed and output interface on the electronic circuit board, antenna connects reed by intercoil connection, antenna and is connected with the amplifier contact, output interface links to each other with the automobile video player, it is characterized in that described amplifier comprises antenna selecting frequency circuit, antenna amplifying circuit and automatic gain control circuit;
Described antenna selecting frequency circuit comprises electric capacity (C1, C2, C4, C5), resistance (R1), inductance (L1); Described antenna amplifying circuit comprises triode V2, resistance (R7, R8, R9, R10, R11), electric capacity (C11, C12, C13, C14);
Automatic gain control circuit comprises double diode (V3, V4), operational amplifier (IC3), triode (V1) and electronic attenuator (IC1).
2, vehicle-mounted video antenna according to claim 1, it is characterized in that described antenna links to each other with electric capacity (C1) in the antenna selecting frequency circuit, electric capacity (C1) and electric capacity (C2) are in series, electric capacity (C4) and inductance (L1) back in parallel is connected in series with electric capacity (C5), the output of electric capacity (C5) links to each other with the input of electronic attenuator (IC1), the output of electronic attenuator (IC1) links to each other with triode (V2) base stage in the antenna amplifying circuit through electric capacity (C8), and the collector electrode of triode (V2) links to each other with output interface through electric capacity (C23).
3, vehicle-mounted video antenna according to claim 1, the positive pole that it is characterized in that the double diode (V4) in the described automatic gain control circuit links to each other with power supply by resistance (R19), the negative pole of double diode (V4) links to each other with the positive pole of double diode (V3), two negative poles of double diode (V3) are respectively by resistance (R13, R15) two inputs with operational amplifier (IC3) link to each other, the output of operational amplifier (IC3) links to each other with the base biasing resistor (R5) of triode (V1), the collector electrode of triode (V1) is respectively by resistance (R3, R4) link to each other with two control ends of electronic attenuator, electronic attenuator (IC1) is serially connected between antenna selecting frequency circuit and the antenna amplifying circuit.
4, vehicle-mounted video antenna according to claim 1 is characterized in that being connected with the biasing voltage stabilizing circuit between the base stage of the triode V2 in the antenna amplifying circuit and the power line, and the biasing voltage stabilizing circuit comprises resistance (R7), pressurizer (IC2), electric capacity (C11).
5, vehicle-mounted video antenna according to claim 1 is characterized in that described antenna is the glass silvering antenna.
6, vehicle-mounted video antenna according to claim 1 is characterized in that antenna has the 2-6 root, every antenna all with one independently amplifier link to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610039247XA CN1845587A (en) | 2006-04-03 | 2006-04-03 | Vehicle-mounted video antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610039247XA CN1845587A (en) | 2006-04-03 | 2006-04-03 | Vehicle-mounted video antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1845587A true CN1845587A (en) | 2006-10-11 |
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ID=37064497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200610039247XA Pending CN1845587A (en) | 2006-04-03 | 2006-04-03 | Vehicle-mounted video antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1845587A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101604959B (en) * | 2009-07-09 | 2012-02-08 | 合肥邦立电子股份有限公司 | Automatic gain vehicle active antenna amplifier |
-
2006
- 2006-04-03 CN CNA200610039247XA patent/CN1845587A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101604959B (en) * | 2009-07-09 | 2012-02-08 | 合肥邦立电子股份有限公司 | Automatic gain vehicle active antenna amplifier |
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