CN2328103Y

CN2328103Y - Antenna circuit board

Info

Publication number: CN2328103Y
Application number: CN 97217216
Authority: CN
Inventors: 项青松
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-05
Filing date: 1997-05-05
Publication date: 1999-07-07
Anticipated expiration: 2007-05-05

Abstract

The utility model relates to an amplifying circuit board in an antenna amplifier. The utility model is composed of a three-way mixing circuit and an amplify circuit. The utility model is characterized in that a V section (1-12 channels) is magnified by a microwave integrated package IC, and a U section (13-56 channels) is amplified in advance by a microwave triode and amplified by two poles of the microwave integrated package IC. The utility model is suitable for outdoor antennae.

Description

The antenna traces plate

The utility model relates to the television receiving antenna amplifier, particularly the category of all-channel amplifying circuit board.

At present popular all-channel amplifies the printed line road, most typical is to amplify with the microwave integrated package, the Chinese patent 88214562.2 active multi-direction full channel tv receiving antennas by name that I was applied in 1989 just belong to this type, in the past few years the antenna amplifying circuit has developed into multistage amplification, amplify one-level with microwave triode, amplify with the microwave integrated package again, above-mentioned amplifying circuit is reasonable to have solved the problem of the television reception in the more weak place of city suburbs and rural tv signal, but along with developing by leaps and bounds of China's tv undertakings, for an acceptance point, can receive tens and even tens TV programme, its TV signal have have by force a little less than, above-mentioned amplifying circuit often is easy to generate self-excitation phenomena, makes television image a slice fuzzy, lower in U section (more than 13 channels) gain, influenced the normal reception of TV.

The purpose of this utility model provides a kind of new-type circuit device, and it has anti-strong platform and promotes the function of U section TV signal.

The utility model adopts following circuit and achieves the goal VI section (1-5 channel), VII section (6-12 channel).Mix laggardly to go into the microwave integrated package and amplify by different filter circuit, being introduced into microwave triode after U section (13-68 channel) filtering amplifies, amplified signal is mixed with V section (1-12 channel) signal, enter microwave integrated circuit again and amplify, the gain of U section is low to be received in the problem that produces self-excitation under the strong platform with the V section thereby solved.

Below in conjunction with accompanying drawing the utility model is made more detailed description: Fig. 1 is an electrical schematic diagram of the present utility model; Fig. 2 is a front view of the present utility model; Fig. 3 is the new rearview of this practicality.

The utility model is by threeway mixing input circuit, two utmost point amplifying circuits, and the filter rectifier of power supply and output circuit are formed, and it is characterized in that:

CZ1 is VI section (1-5 channel) aerial signal input adapter, by capacitor C 1, C2, inductance L 2, the L3 series connection is at C1, meet L1 on company's point of C2, the other end ground connection of L1 is in capacitor C 2, connect capacitor C 3 on the contact of inductance L 2, the other end ground connection of capacitor C 3, inductance L 2, connect capacitor C 4 on the contact of L3, the other end ground connection of capacitor C 4, constitute the filter circuit of V1 (1-5 channel), CZ2 is the aerial signal input adapter of VIII section (6-12 channel), by capacitor C 6, and inductance L 4, capacitor C 7, C8, the C5 series connection connects inductance L 3 on the contact of capacitor C 7 and C8, the other end ground connection of inductance L 3, in capacitor C 8, connect inductance L 6 on the contact of C5, inductance L 6 other end ground connection are formed VIII section filter circuit, VI and VIII section TV signal are mixed after inductance L 10, and capacitor C 9 is to the input of microwave ic chip.CZ3 is U section (13-56 channel) TV signal input adapter, by capacitor C 10, the C11 series connection, on the contact of CZ3 and capacitor C 1, connect inductance L 7, the other end ground connection of inductance L 7 in capacitor C 10, connects inductance L 8 on the contact of C11, the other end ground connection of inductance L 8 and form the filter circuit of U section, the base stage of input microwave triode BG1.CZ4 is the signal output interface of amplifier, also be the input interface of power supply simultaneously, microwave integrated circuit IC output signal is through capacitor C 15, C16, the T shape filter circuit that inductance L 11 is formed is exported from CZ4, AC power is also imported from CZ4, through inductance L 12 to rectifier diode D1 rectification again through capacitor C 17, after the C18 filtering, through current-limiting resistance R3, filter capacitor C12, the amplifying circuit power supply that provides BG1 to form, resistance R 4 provides microwave integrated circuit IC power supply, and C19 is the high frequency short circuit electric capacity of rectifying tube D1, and R1 is a microwave triode BG1 biasing resistor; R2 is a microwave triode BG1 load resistance, C13, and C14 and inductance L 9 are formed T shape filtering output circuit, and BG1 is outputed signal to the microwave ic chip.R3, LED form this wiring board indicating circuit.

The utility model compared with prior art, the TV signal after three frequency ranges are amplified is relatively more balanced, it is too high and even produce self-excitation phenomena can not produce VI (1-5 frequently) gain, U section (13-56 channel) gain is on the low side, makes picture unclear.

The utility model uses identical with common antenna amplifier antennafire, circuit is installed in the antenna amplifier antennafire, antenna amplifier antennafire is installed on the montant of exterior aerial, connect amplifier and power pack with 75 Ω coaxial cables, in the TV signal out-put supply box after 75 Ω coaxial cables will amplify, be provided with the signal output socket in the power pack, be connected with television set with radio frequency cable.The low pressure alternating current source of the 10V 50Hz that the coaxial cable of 75 Ω also provides power pack simultaneously is passed in the antenna amplifier antennafire, for line work.

Claims

1, a kind of television antenna wiring board is by the threeway hybrid circuit, amplifying circuit, output circuit, current rectifying and wave filtering circuit is formed, it is characterized in that CZ1 is VI section (1-5 channel) aerial signal input adapter, by capacitor C 1, C2, inductance L 2, the L3 series connection, at C1, meet L1 on company's point of C2, the other end ground connection of L1, in capacitor C 2, connect capacitor C 3 on the contact of inductance L 2, the other end ground connection of capacitor C 3, inductance L 2, connect capacitor C 4 on the contact of L3, the other end ground connection of capacitor C 4, constitute the filter circuit of V1 frequency range (1-5 channel), CZ2 is the aerial signal input adapter of VIII section (6-12 channel), by capacitor C 6, inductance L 4, capacitor C 7, C8, the C5 series connection, on the contact of capacitor C 7 and C8, connect inductance L 3, the other end ground connection of inductance L 3 in capacitor C 8, connects inductance L 6 on the contact of C5, inductance L 6 other end ground connection are formed VIII section filter circuit, VI and VIII section TV signal are mixed after inductance L 10, and capacitor C 9 is to the input of microwave ic chip, and CZ3 is U section (13-56 channel) TV signal input adapter, by capacitor C 10, the C11 series connection connects inductance L 7, the other end ground connection of inductance L 7 on the contact of CZ3 and capacitor C 1, in capacitor C 10, connect inductance L 8 on the contact of C11, the other end ground connection of inductance L 8 and form the filter circuit of U section, the base stage of input microwave triode BG1, CZ4 is the signal output interface of amplifier, also be the input interface of power supply simultaneously, microwave integrated circuit IC output signal is through capacitor C 15, C16, the T shape filter circuit that inductance L 11 is formed is exported from CZ4, AC power is also from CZ4 input, through inductance L 12 to rectifier diode D1 rectification again through capacitor C 17, after the C18 filtering, through current-limiting resistance R3, filter capacitor C12, the amplifying circuit power supply that provides BG1 to form, resistance R 4 provides microwave integrated circuit IC power supply, C19 is the high frequency short circuit electric capacity of rectifying tube D1, and RI is a microwave triode BG1 biasing resistor; R2 is a microwave triode BG1 load resistance, C13, and C14 and inductance L 9 are formed T shape filtering output circuit, and BG1 is outputed signal to the microwave ic chip, and R3, LED form this wiring board 001 indicating circuit.