CN2315736Y

CN2315736Y - Amplifier for full channel TV antenna

Info

Publication number: CN2315736Y
Application number: CN 97250385
Authority: CN
Inventors: 周锡明
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-08
Filing date: 1997-12-08
Publication date: 1999-04-21
Anticipated expiration: 2007-12-08

Abstract

The utility model relates to an amplifier of a full-channel TV antenna, mainly composed of an LC filter and amplifying circuits. Through thereof filters, TV signals of the frequency band UHF, TV signals of the frequency band VH and TV signals of the frequency band VL are connected to a mixing, and then, an UHF-signal output and an VHF-signal output are respectively generated through amplification of 1 to 3 stages, wherein, after output through a UHF amplifying circuit, the UHF-signals are combined with the VHF signals into one-path output. As a result, the utility model has the advantages of simple and reliable structure, convenient production and adjustment, high gain, less index of noise, low manufacture cost, etc.

Description

Full-channel tv antenna amplifier

The utility model is a kind of signal amplifying apparatus of full channel tv receiving antenna, belongs to the television receiving antenna field.

At present, comprise on the market that the indoor and outdoors television receiving antenna is of a great variety, the amplifier that matches with it also has various, but with regard to amplifier, its structure is formed two kinds nothing more than: a kind of is to adopt integrated circuit or transistor and integrated circuit series connection, each frequency band signals input and be connected into one the road after mix and amplify output, the amplifier of this structure easily produces self-excitation, noise factor is big, and result of use is poor.Another kind of amplifier architecture is to adopt a plurality of transistors to make amplifier, each channel all amplifies the back separately and mixes output, though its result of use is also desirable, but because of using a plurality of transistors, what have reaches 9 more than, and makes its manufacturing cost height, and volume is big, the production debug difficulties is not suitable for mass production and marketing and uses.

The purpose of this utility model is in order to overcome the deficiency of above-mentioned existence, and provides a kind of simple in structure, and cost is low, and the better full-channel tv antenna amplifier of result of use.

The utility model is mainly joined by LC filter and amplifying circuit and forms, the signal of UHF, VH and three frequency ranges of VL is behind the filter that is connected to separately and be connected into one the tunnel, be connected to amplifying circuit of 1-3 level then, divide again and pick out UHF and the output of VHF two road signals, wherein the output of UHF signal is connected to 1-3 level secondary amplifying circuit again, exports and be connected into one tunnel output with the VHF signal through amplifying output.

The utility model can all be chosen as the one-level amplifying circuit with amplifying circuit and secondary amplifying circuit.

The utility model also can be chosen as the one-level amplifying circuit with an amplifying circuit, and the secondary amplifying circuit is a second amplifying circuit.

The utility model also can be chosen as second amplifying circuit with an amplifying circuit, and the secondary amplifying circuit is the one-level amplifying circuit.

The utility model also is in series with an adjustable potentiometer behind the signal input part of UHF, VH and three frequency ranges of VL or frequency band filter separately, to regulate the power of its input signal, output gain after the amplification is reached be fit to various places because the different result of use of acceptance point field intensity.

Description of drawings is as follows:

Fig. 1 is the frame principle figure of the utility model three pipe amplifiers.

Fig. 2 is the circuit theory diagrams of the utility model three pipe amplifiers.

Fig. 3 is the frame principle figure of the another kind of three pipe amplifiers of the utility model.

Fig. 4 is the frame principle figure of the utility model two pipe amplifiers.

The utility model is further introduced below in conjunction with accompanying drawing: Fig. 1, the utility model divides UHF, three frequency ranges of VH and VL are received television signal respectively, the uhf band signal is connected to first order mixed once amplifying circuit 4 after by filter 1, and VH and VL frequency band signals are also respectively by being connected to respectively behind the filter 2 and 3 separately on the first order mixed once amplifying circuit 4, behind filter 5, be connected to second level mixed once amplifying circuit 6 again, wherein the uhf band signal behind second level mixed once amplifying circuit 6 is connected to first utmost point secondary amplifying circuit 8 behind UHF filter 7, and then exports after filter 9 filtering; And the VHF signal tap behind the amplifying circuit 6 in the second level come out after filter 10 filtering with through filter 9 filtered UHF signals and be connected into one tunnel output.

Fig. 2, the UHF TV signal inputs on the filter of being made up of C1, C2, C2, C4, L1, L2, L3, L4 1 after its antenna oscillator is accepted, and elimination 470MHZ is following and stop the signal of 960MHZ to pass through.The VH TV signal inputs on the filter of being made up of L5, L5, L7, C5, C6 2 after its antenna oscillator receives, and 2 in this filter allows the signal of 160MHZ--230MHZ to pass through.And the VL TV signal inputs on the filter of being made up of L9, L10, L11, C7, C8 3 after its antenna oscillator receives, and it only allows the signal of 45MHZ--95MHZ to pass through.C9, C10, L12, L13 make the following signal ground of 45MHZ, and L13 stops the UHF signal to pass through simultaneously.R1, R2, R3, C11, L14, VT1 have formed amplifying circuit 4 of the first order, and the composite video signal of mixed 470--960MHZ, 160--230MHz, 45--95MHz is amplified.C12, C13, L15 have formed high pass filter 5, and the above TV signal of 45MHz after the amplification is coupled on the base stage of VT2.R4, R5, R6, C14, L16, VT2 have formed second level mixed once amplifying circuit 6, once more composite video signal are amplified.Behind second level mixed once amplifying circuit 6, divide and pick out UHF and VHF two paths of signals, the UHF TV signal will be coupled on the base stage of VT3 through the UHF TV signal after two-stage is once amplified via the UHF filter 7 that L17, L18, L19, C15, C16, C17 form.R8, R9, R10, C25, L23, VT3 have formed first order secondary amplifying circuit 8, and the UHF TV signal is amplified once more.After this first order secondary amplifying circuit 8, also be connected to the filter of forming by C26, C27, C28, L24, L25, L26 9, output behind this filter 9.And be connected to the VHF traffic filter of forming by C20, C21, C22, L20, L21, L22 10 through the VHF signal that second level mixed once amplifying circuit 6 is drawn, VH that at last will be after two-stage is amplified and VL frequency band signals are merged into one tunnel output with uhf band television signal after three grades of amplifications, again through C31 or C32 to the television signal input jack.L28, L29 are the high-frequency isolation inductance, play logical low-frequency voltage, resistance high-frequency TV signal.Operating voltage of the present utility model is by power transformer B the 220V civil power to be transformed into low-voltage, obtains after isolating inductance L 28, L29, rectifier diode VD1 and filter capacitor C23, C18 isolation respectively, rectification, worry ripple.The supply power voltage at VT1, VT2 the two poles of the earth is supplied with after R7 step-down, DW voltage stabilizing, and when using line voltage to change in a big way, the amplifier working point is unaffected.LED1, LED2 are respectively the power supply indications of amplifier and power supply.The course of work summary of entire circuit is mixed into one the tunnel respectively for UHF, VH, three frequency ranges of VL behind filter filtering separately, after mixing amplification, secondary is separated into UHF and VHF two-way again, again the uhf band signal is carried out one-level and amplifies separately, through after the filtering with mix VHF signal after amplifying and be merged into one the tunnel and export the television set input to.In the present embodiment, select that gain amplifier height, noise factor are little, low in energy consumption, the microwave triode of cut-off frequency more than 1000MHZ made amplifier tube.

Fig. 3, shown in the figure another kind of embodiment, present embodiment also divides UHF, VH, three frequency ranges of VL are come received television signal respectively, UHF, VH, three frequency band signals of VL are connected to filtering pipe 1 separately respectively, 2,3, then and be connected into one the tunnel and be connected to one-level and mix amplifying circuit 4, divide then and pick out UHF and VHF two-way, the UHF signal is connected to UHF one-level secondary amplifying circuit 6 after being connected to UHF filter 5, uhf band signal after amplifying is connected to filter 7 again, filtered uhf band signal is connected to UHF secondary secondary amplifying circuit 8 again, and the back of coming out is inserted filter 9 and exported then.And after the VHF frequency band signals branch behind the one-level mixed once amplifying circuit 4 picks out, be connected to VHF filter 10 then with UHF signal behind UHF filter 9 and be connected into one tunnel output.Because the filter in the said structure is identical with Fig. 2 corresponding construction with the formation of amplifying circuit, so its circuit theory is not described in detail.

Fig. 4 present embodiment is the structure of another kind of two pipe amplifiers, it also divides UHF, VH, three frequency ranges of VL received television signal respectively, these three frequency band signals are connected to filter 1,2,3 separately respectively, then and be connected into one the tunnel and be connected to amplifying circuit 4 of one-level, after one-level is mixed amplification, divide and pick out UHF and VHF two paths of signals, wherein the UHF signal is connected to UHF one-level secondary amplifying circuit 6 after being connected to UHF filter 5 again, and then is connected to filter 7 back outputs.And the VHF signal is connected to VHF filter 10 backs and UHF signal and connects back output.Filter in the present embodiment and amplifying circuit are also basic identical in the structure content shown in Fig. 2, so its circuit theory also is not described in detail.

The utility model also can be as required, in above-mentioned several embodiment, behind the signal input part of UHF, VH and three frequency ranges of VL or frequency band filter separately, be in series with an adjustable potentiometer, to regulate the power of its input signal, output gain after the amplification is reached be fit to various places because the different result of use of acceptance point field intensity.

The utility model compared with prior art, have simple in structure, reliable, to make debugging convenient, gain is high, Noise coefficient is little, low cost of manufacture, and adapted is being pressed on the channel signals reception antenna of three sections any styles, all energy Reach the characteristics such as result of use is superior.

Claims

1, a kind of full-channel tv antenna amplifier, it is made up of LC filter and amplifying circuit, the signal that it is characterized in that UHF, VH, three frequency ranges of VL is imported respectively on the filter (1,2,3) that is connected to separately, then and be connected to after being connected into one the tunnel on the 1--3 level mixed once amplifying circuit, after mixing amplification, divide and pick out UHF and the output of VHF two paths of signals, wherein be connected to 1--3 level secondary amplifying circuit again after the output of UHF signal, one tunnel output is exported and be connected into to the UHF signal after this secondary amplifies with the VHF signal that mixes after amplifying.

2, full-channel tv antenna amplifier as claimed in claim 1 is characterized in that a described amplifying circuit and secondary amplifying circuit are the one-level amplifying circuit.

3, full-channel tv antenna amplifier as claimed in claim 1 is characterized in that a described amplifying circuit is that one-level is mixed amplifying circuit, and the secondary amplifying circuit is a secondary UHF amplifying circuit.

4, full-channel tv antenna amplifier as claimed in claim 1 is characterized in that a described amplifying circuit is a secondary mixing amplifying circuit, and the secondary amplifying circuit is an one-level UHF amplifying circuit.

5,, it is characterized in that being in series with an adjustable potentiometer behind the signal input part of described UHF, VH, three frequency ranges of VL or the frequency band filter separately as claim 2 or 3 or 4 described full-channel tv antenna amplifiers.