CN2535988Y

CN2535988Y - All-channel direction-selecting television antenna amplifier

Info

Publication number: CN2535988Y
Application number: CN02233017U
Authority: CN
Inventors: 马洪亮
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-19
Filing date: 2002-04-19
Publication date: 2003-02-12
Anticipated expiration: 2012-04-19

Abstract

The utility model relates to an antenna amplifier for an all-channel direction-chose TV, which comprises an input circuit for a set of all-channel receiving signal and a prime amplifying circuit which is relatively and electrically connected with the input circuit and amplifies the input signal. Various frequency band signal exported by the prime amplifying circuit is received by a sharing amplifying circuit and is amplified in the chosen direction under the control of the direction-chose conversion circuit, and the chose frequency band signal is amplified by the sharing amplifying circuit and exported into the video input end of the TV. The utility model imports the input signal with different frequency band in different path which is amplified by the relative amplifying circuit chose by the controller, thereby effectively abating the mutual interference among frequency bands, and improving the visualization effect of gain and TV pictures. Simultaneously, the utility model has simple structure and low breakdown rate.

Description

The all-channel choosing is to TV antenna booster

Technical field

The utility model relates to a kind of all-channel choosing to TV antenna booster.

Background technology

The antenna amplifier antennafire that uses mostly is to adopt the amplification mode of mixing at present, and promptly the signal to the frequency-selecting input carries out comprehensive amplification by amplifier.Though this kind amplifier has certain amplification to signal, can not effectively face upward the interference of system homogenous frequency signal, particularly, cause overflow in the more intense area of signal, have a strong impact on the quality of accepting of TV.Simultaneously watch the program of a certain TV station, also need to adjust the correspondence position of television antenna for better quality.Promptly inconvenient, antenna phase inversion device easily breaks down again.

Summary of the invention

The purpose of this utility model is to provide a kind of and prevents that effectively homogenous frequency signal from disturbing, the all-channel of high-fidelity signal selects to TV antenna booster.

The purpose of this utility model is achieved in that it comprises the all-channel input circuit of a group of received by television antenna conveying signal, the all-channel input circuit carries out frequency-selecting to the signal of the different frequency range of acceptance, and transport to the input of the preamplifying circuit of correspondence, electrical connection with it, preamplifying circuit amplifies the signal of different frequency range respectively.It comprises that also shared amplifying circuit and choosing are to change-over circuit, choosing connects the control input end of preamplifying circuit respectively to control signal to the choosing of change-over circuit output, the input that exports shared amplifying circuit under the control of change-over circuit to is being selected in the output of preamplifying circuit, and the output of shared amplifying circuit connects the video inputs of television set.

The technological progress that the utility model is obtained is: this amplifier adopts the input signal to different frequency range to carry out shunt frequency-selecting input, and selects corresponding amplifying circuit that it is amplified by controller.Thereby effectively face upward the phase mutual interference of having made between frequency range, improved the imaging results of gain and TV image.The utility model is simple in structure simultaneously, failure rate is low.

Description of drawings

Fig. 1 is a block diagram of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

Embodiment

Be that embodiment further specifies the utility model below with the accompanying drawing: this TV antenna booster comprises the input circuit of one group of all-channel received signal and corresponding with it, that be electrically connected and that input signal is amplified preamplifying circuit as shown in Figure 1, 2, at choosing preamplifying circuit under the control of change-over circuit each frequency band signals of importing is selected to amplification, amplify again by the signal of shared amplifying circuit, and the signal of selected channel is exported to the video inputs of television set by shared amplifying circuit selected channel.Said all-channel input circuit is made up of the frequency-selecting input circuit of VHF, U1, U2 and U3 section.The composition of each circuit and operation principle division are as follows:

The function of VHF frequency-selecting input circuit mainly is to select the signal of VHF section from the all-channel signal of antenna output, this input circuit is by inductance L 1-L10, capacitor C 1-C6 and resistance R constitute, inductance L 1, inductance L 2 is connected with capacitor C 1, inductance L 3 be connected to signal input part after capacitor C 2 is connected, its signal input part divides two-way to insert again, one road and the capacitor C 7 of connecting mutually, inductance L 7, capacitor C 9, inductance L 9 links to each other, inductance L 8 and capacitor C 8 are connected to the node place of 7 of capacitor C 9 and inductance L, another road and the capacitor C 3 of connecting mutually, inductance L 4, inductance L 6, capacitor C 5, resistance R links to each other, inductance L 5 and capacitor C 4 are connected to the node place of 4 of inductance L 6 and inductance L, resistance R is joined with capacitor C 6 that is connected in series and inductance L 10 with the node of 9 of inductance L, and the other end of inductance L 10 is the output of input circuit.

The major function of U1, U2 and U3 frequency-selecting input circuit is to select the signal of U1, U2 and U3 frequency range from the full frequency band signal of antenna output.Each input circuit is made of with the identical mode filter of capacitor C 19-C20 built-up circuit with capacitor C 13-C14, inductance L 21-L23 with capacitor C 30-C31, inductance L 14-L16 inductance L 27-L29 respectively.

Preamplifying circuit is accepted VHF, U1, U2 and the U3 full frequency band signal of frequency-selecting input circuit output respectively, and its signal is carried out the preposition amplification of shunt.This preamplifying circuit is made of 1 to 3 group of amplifying circuit that circuit structure is identical, and present embodiment is selected three groups for use, and wherein VHF and U1 section are shared one group, also can distinguish one group of independent use.It should be made up of resistance R 1-R2, capacitor C 10-C12, inductance L 11, L13 and triode Q1 by the group amplifying circuit, node between resistance R 1, R2 connects the base stage of triode Q1, resistance R 1 links to each other with the collector electrode of triode Q1 with the node of 10 of capacitor C, capacitor C 11,12, be connected in series with inductance L 13, the collector electrode of another termination triode Q1 of capacitor C 11, contact between one termination capacitor C11, the C12 of inductance L 11, the other end of inductance L 13 is the output of this amplifying circuit.As the shared amplifying circuit of this section, the video inputs of television set is directly imported in its output to this amplifying circuit through capacitor C 32 again in addition.The U2 amplifying circuit is made up of resistance R 5-R7,

capacitor C

15,16, inductance L 18 and triode Q2.The U3 amplifying circuit is made up of resistance R 11,12, capacitor C 21, inductance L 24 and triode Q3.The input that exports shared amplifying circuit to of the two.The annexation of U2 and U3 two amplifying circuits and operation principle as VHF and U1 section amplifying circuit, no longer repeat substantially.

The function of shared amplifying circuit is that the signal that U2, U3 section are imported is amplified the video inputs that exports television set to again.This circuit is made up of resistance R 8, R9, capacitor C 17, C18, C32, inductance L 20 and triode Q4, node between resistance R 8, R9 connects the base stage of triode Q4, the collector electrode of another termination triode Q4 of resistance R 8, the collector electrode of triode Q4 exports the video inputs of television set to through capacitor C 17, inductance L 20 and capacitor C 18, C32.

Choosing is by the output state of control preamplifying circuit to the function of change-over circuit, selects different watched channels.It is by resistance R 3, R7, R13-R19, capacitor C 22-C29, inductance L 7, L12, L25, L26, diode D1-D3 and triode Q5-Q8, key switch K and controller IC are formed, key switch K is connected to the base stage of triode Q8, the emitter of triode Q8 is through the inductance L 26 of serial connection, diode D2, resistance R 18, capacitor C 22 connects the CLK end of controller IC, resistance R 19 and capacitor C 23 are connected to the node place of 18 of diode D2 and resistance R, three tunnel outputs of controller IC connect the base stage of triode Q5-Q7 respectively, the emitter of triode Q5-Q7 is respectively through resistance R 3 and inductance L 12, resistance R 7 and inductance L 17, resistance R 13 and inductance L 25 export the collector electrode of triode Q1-Q3 in the preamplifying circuit to, and the collector electrode of triode Q5-Q7 is connected with power supply.During use, by multiple key switch K, pulse signal of emitter output of triode Q8, this signal is successively through inductance L 30, diode D2, resistance R 8, the CLK input of capacitor C 22 access controller IC, high potential control signal of controller IC output inserts the base stage of triode Q7, triode Q7 conducting, high level of its emitter output inserts the collector electrode of triode Q3, triode Q3 amplifies the vision signal of the U3 section of input, and export the input of shared amplifying circuit to by its collector electrode, promptly insert the base stage of triode Q4, through the amplification of triode Q4, its vision signal that is exaggerated exports the video inputs of television set to through capacitor C 32 again.Successively by multiple key switch K, i.e. control selects the vision signal of U2, U1 and VHF section to transport to the video inputs of television set when again.Its course of work as above no longer repeats.

The power circuit of this amplifier is made up of transformer T1, diode D2--D4, capacitor C 24, C25, C27, C33, inductance L 30, triode Q8 and resistance R 20.This power circuit can be amplifier DC power supply is provided.

Claims

1, a kind of all-channel choosing is to TV antenna booster, it comprises one group of all-channel input circuit and preamplifying circuit corresponding with it, that be electrically connected, it is characterized in that it comprises that also shared amplifying circuit and choosing are to change-over circuit, described choosing connects the control input end of amplifying circuit respectively to control signal to the choosing of change-over circuit output, the output of amplifying circuit is electrically connected with the input of shared amplifying circuit, and the output of shared amplifying circuit connects the video inputs of television set.

2, follow according to the described amplifier of claim 1, it is characterized in that said all-channel input circuit is made up of the frequency-selecting input circuit of VHF, U1, U2 and U3 section.

3, follow according to the described amplifier of claim 2, the frequency-selecting input circuit that it is characterized in that said VHF section is by inductance L 1-L10, capacitor C 1-C6 and resistance R constitute, inductance L 1, inductance L 2 is connected with capacitor C 1, inductance L 3 be connected to signal input part after capacitor C 2 is connected, its signal input part divides two-way to insert again, one road and the capacitor C 7 of connecting mutually, inductance L 7, capacitor C 9, inductance L 9 links to each other, inductance L 8 links to each other with the node of capacitor C 8 with 9 of inductance L 7 and capacitor C, another road and the capacitor C 3 of connecting mutually, inductance L 4, inductance L 6, capacitor C 5, resistance R links to each other, inductance L 5 and capacitor C 4 are connected to the node place of 4 of inductance L 6 and inductance L, resistance R is joined with capacitor C 6 that is connected in series and inductance L 10 with the node of 9 of inductance L, and the other end of inductance L 10 is the output of input circuit.

4, follow according to the described amplifier of claim 2, it is characterized in that the frequency-selecting input circuit of said U1, U2 and U3 section is made of with the identical mode filter of capacitor C 19-C20 built-up circuit with capacitor C 13-C14, inductance L 21-L23 with capacitor C 30-C31, L14-L16 inductance L 27-L29 respectively.

5, follow according to the described amplifier of claim 2, it is characterized in that said preamplifying circuit is made of 1 to 3 group of amplifying circuit that circuit structure is identical, its each group amplifying circuit is by resistance R 1-R2, capacitor C 10-C12, inductance L 11, L13 and triode Q1 form, resistance R 1, node between R2 connects the base stage of triode Q1, resistance R 1 links to each other with the collector electrode of triode Q1 with the node of 10 of capacitor C, capacitor C 11, C12 is connected in series the collector electrode of a termination triode Q1 of back capacitor C 11 with inductance L 3, inductance L 11 connects and capacitor C 11, node between C12, the other end of inductance L 3 are the output of preamplifying circuit.

6, follow according to the described amplifier of claim 1, it is characterized in that said shared amplifying circuit is made up of resistance R 8, R9, capacitor C 17, C18, C32, inductance L 20 and triode Q4, node between resistance R 8, R9 connects the base stage of triode Q4, the collector electrode of another termination triode Q4 of resistance R 8, the collector electrode of triode Q4 exports tv signal input to through capacitor C 17, inductance L 20 and capacitor C 18, C32.

7, amplifier according to claim 1, it is characterized in that said choosing to change-over circuit by resistance R 3, R7, R13-R19, capacitor C 22-C29, inductance L 17, L12, L25, L26, L30, diode D1-D3 and triode Q5-Q8, key switch K and controller IC are formed, key switch K is connected to the base stage of triode Q8, the emitting stage of triode Q8 is through the inductance L 30 of serial connection, L26, diode D2, resistance R 18, capacitor C 22 connects the CLK end of controller IC, resistance R 19 and capacitor C 23 are connected to the node place of 18 of diode D2 and resistance R, the output of controller IC connects the base stage of triode Q5-Q7 respectively, the emitter of triode Q5-Q7 is respectively through resistance R 3 and inductance L 12, resistance R 7 and inductance L 7, resistance R 13 and inductance L 25 export the collector electrode of triode Q1-Q3 in the preamplifying circuit to, and the collector electrode of triode Q5-Q8 is connected with power supply.