CN205017312U - Seven tubs of superheterodyne AM receivers - Google Patents
Seven tubs of superheterodyne AM receivers Download PDFInfo
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- CN205017312U CN205017312U CN201520665254.5U CN201520665254U CN205017312U CN 205017312 U CN205017312 U CN 205017312U CN 201520665254 U CN201520665254 U CN 201520665254U CN 205017312 U CN205017312 U CN 205017312U
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Abstract
The utility model discloses a seven tubs of superheterodyne AM receivers, including input tuning circuit, band -pass filter, IF amplifier circuit, local oscillation circuit, automatic gain control circuit, detection circuit, low frequency amplifier circuit, demodulator and audio output circuit, band -pass filter and input tuning circuit electric connection, IF amplifier circuit and band -pass filter electric connection, local oscillation circuit and band -pass filter electric connection, automatic gain control circuit respectively with IF amplifier circuit and detection circuit electric connection, demodulator and low frequency amplifier circuit electric connection, audio output circuit and demodulator electric connection. The utility model discloses in the use, improve debugging efficiency, reinforcing teaching effects, easy operation, the beginner masters very easily, as long as strictly go on according to the operating procedure, just can accurate completion debugging work, listen to.
Description
Technical field
The utility model belongs to receiver technics field, is specifically related to seven pipe superhet amplitude-modulation receiver.
Background technology
Radio communication is particularly important in present life, the mobile phone that we commonly use, and radio telephone also has the remote controller etc. of various electrical equipment, all be unable to do without transmitting and receiving apparatus.Frequency and amplitude modulation is two kinds of most widely used at present transmission and reception modes, along with social development mode of frequency regulation more and more becomes the necessary working method of modern comfort.
So-called superhet, refers to after being mixed up in tuning circuit in the radio station that will receive, through the effect of oversampling circuit itself, just becomes the frequency that another one pre-determines, and then carry out amplifying and detection.This fixing frequency is produced by the effect of difference frequency.In the design process of superhet FM receiver, should be divided into High frequency amplification, mixing, local oscillator, in put, frequency discrimination, low frequency amplify six parts.
But there are the following problems for existing superhet amplitude-modulation receiver: low frequency signal output line and high-frequency signal output line are obscured.The high-frequency signal output of high frequency signal generator exports employing two with low frequency signal and overlaps output port, in practice process, because of different to the familiarity of equipment, low frequency signal output line and high-frequency signal output line is often caused to obscure, thus signal injection accurately can not be used in debug process, cause debugging error; The poor accuracy of frequency adjustment, high frequency signal generator adopts manual type regulation output frequency, adopt the rough method for expressing of different frequency range, different graduation indication,---as accurately do not obtained the frequency of 1605KHz, and can only use 1600KHz to replace---has a strong impact on the accuracy of debugging usually can not accurately to obtain required frequency when adjusting concrete frequency.In sum, traditional superhet medium wave band amplitude-modulation receiver adjusting instrument equipment not only volume is large, and cost is high, and debug process needs repeatedly to adjust signal frequency, not easily accurately realize, and has a strong impact on audibility.
Utility model content
The purpose of this utility model is to provide seven pipe superhet amplitude-modulation receiver, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme: seven pipe superhet amplitude-modulation receiver, comprise input tuning circuit, bandpass filters, intermediate frequency amplifier circuit, local-oscillator circuit, automatic gain control circuit, detecting circuit, low-frequency amplifier circuit, demodulator and audio output circuit, described bandpass filters and input tuning circuit are electrically connected, described intermediate frequency amplifier circuit and bandpass filters are electrically connected, described local-oscillator circuit and bandpass filters are electrically connected, described automatic gain control circuit is electrically connected with intermediate frequency amplifier circuit and detecting circuit respectively, described low-frequency amplifier circuit and detecting circuit are electrically connected, described demodulator and low-frequency amplifier circuit are electrically connected, described audio output circuit and demodulator are electrically connected.
Preferably, described intermediate frequency amplifier circuit comprises first order intermediate frequency amplifier circuit and second level intermediate frequency amplifier circuit, and first order intermediate frequency amplifier circuit and second level intermediate frequency amplifier circuit are electrically connected.
Preferably, described input tuning circuit is made up of the primary coil of CA and T1 of doubly-linked variable capacitor, the wireless connections of T1 and RF input circuit.
Technique effect of the present utility model and advantage: this seven pipes superhet amplitude-modulation receiver, input tuning circuit is made up of the primary coil of CA and T1 of doubly-linked variable capacitor, it is an antiresonant circuit, T1 is magnetic antenna coil, the high-frequency signal of coming in is received from antenna, selected the radio signals of needs by the resonance of input tuning circuit, as change CA, just can receive the radio signals of different frequency; Frequency changer circuit, local oscillation and mixing collectively frequency changer circuit, frequency changer circuit is centered by VT1, its effect is the medium frequency electric signal different frequency radio signals received by input tuning circuit being transformed into fixing 465KHz, and it is the constant amplitude high-frequency oscillation signal of generation one than frequency input signal height 465kHz; Intermediate frequency amplifier circuit, primarily of the two-stage intermediate frequency amplifier of VT2 and VT3 composition; Detection and agc circuit: intermediate-freuqncy signal is coupled to detection tube VT3 by T4 after one-level intermediate frequency amplifier fully amplifies, VT3 both played amplification, was again detection tube, the triode detection circuit that VT3 is formed, detection efficiency is high, has stronger automatic growth control (AGC) effect.The main task of detector stage is that intermediate frequency amplitude-modulated signal is reduced into audio signal, and C4, C5 play the intermediate frequency component of elimination remnants; The superhet medium wave band amplitude-modulation receiver debugging instrument that the utility model designs and produces can obtain output frequency and output voltage accurately, can avoid occurring mistake completely; The utility model in use, improves debugging efficiency, strengthens teaching efficiency, simple to operate, and beginner is easy to grasp, as long as strictly carry out according to operating procedure, just accurately can complete debugging efforts, listen to.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides seven pipe superhet amplitude-modulation receiver as shown in Figure 1, comprise input tuning circuit, bandpass filters, intermediate frequency amplifier circuit, local-oscillator circuit, automatic gain control circuit, detecting circuit, low-frequency amplifier circuit, demodulator and audio output circuit, described bandpass filters and input tuning circuit are electrically connected, described intermediate frequency amplifier circuit and bandpass filters are electrically connected, described local-oscillator circuit and bandpass filters are electrically connected, described automatic gain control circuit is electrically connected with intermediate frequency amplifier circuit and detecting circuit respectively, described low-frequency amplifier circuit and detecting circuit are electrically connected, described demodulator and low-frequency amplifier circuit are electrically connected, described audio output circuit and demodulator are electrically connected.
Operation principle: broadcasting station broadcast items first sound is converted to audio electrical signal by microphone, modulated by high-frequency signal (carrier wave) after amplifying, at this moment a certain parameter of high-frequency carrier signal is along with the corresponding change of audio signal do, the audio signal that will transmit is made to be included within high-frequency carrier signal, high-frequency signal is again through amplifying, then when high-frequency current flows through antenna, form radio wave outwards to launch, velocity of radio wave is 3 × 108m/s, this radio wave is received by radio antenna, then through amplifying, demodulation, be reduced to audio electrical signal, send in speaker voice coil, cone is caused to vibrate accordingly, just original sound can be gone back, namely be the process of acoustic-electric conversion transmission-electroacoustic conversion, the high-frequency signal that antenna receives is sent in frequency-converter tube by input tuning circuit and is mixed together with wireless local-oscillator circuit---frequency conversion, a new frequency is produced namely by intermediate frequency that difference frequency produces at the load circuit (frequency-selecting) of converter stage, intermediate frequency only changes and carries wave frequency, originally audio pack winding thread does not change, intermediate-freuqncy signal can be amplified better, and intermediate-freuqncy signal through detection and filtering high-frequency signal, then is put through low, after power amplification, promote loud speaker and sound.
Last it is noted that the foregoing is only preferred embodiment of the present utility model; be not limited to the utility model; although be described in detail the utility model with reference to previous embodiment; for a person skilled in the art; it still can be modified to the technical scheme described in foregoing embodiments; or equivalent replacement is carried out to wherein portion of techniques feature; all within spirit of the present utility model and principle; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (3)
1. seven pipe superhet amplitude-modulation receiver, comprise input tuning circuit, bandpass filters, intermediate frequency amplifier circuit, local-oscillator circuit, automatic gain control circuit, detecting circuit, low-frequency amplifier circuit, demodulator and audio output circuit, it is characterized in that: described bandpass filters and input tuning circuit are electrically connected, described intermediate frequency amplifier circuit and bandpass filters are electrically connected, described local-oscillator circuit and bandpass filters are electrically connected, described automatic gain control circuit is electrically connected with intermediate frequency amplifier circuit and detecting circuit respectively, described low-frequency amplifier circuit and detecting circuit are electrically connected, described demodulator and low-frequency amplifier circuit are electrically connected, described audio output circuit and demodulator are electrically connected.
2. seven pipe superhet amplitude-modulation receiver according to claim 1, it is characterized in that: described intermediate frequency amplifier circuit comprises first order intermediate frequency amplifier circuit and second level intermediate frequency amplifier circuit, first order intermediate frequency amplifier circuit and second level intermediate frequency amplifier circuit are electrically connected.
3. seven pipe superhet amplitude-modulation receiver according to claim 1, it is characterized in that: described input tuning circuit is made up of the primary coil of CA and T1 of doubly-linked variable capacitor, T1 is connected with RF input circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520665254.5U CN205017312U (en) | 2015-08-28 | 2015-08-28 | Seven tubs of superheterodyne AM receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520665254.5U CN205017312U (en) | 2015-08-28 | 2015-08-28 | Seven tubs of superheterodyne AM receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205017312U true CN205017312U (en) | 2016-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520665254.5U Expired - Fee Related CN205017312U (en) | 2015-08-28 | 2015-08-28 | Seven tubs of superheterodyne AM receivers |
Country Status (1)
| Country | Link |
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| CN (1) | CN205017312U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656363A (en) * | 2016-12-02 | 2017-05-10 | 昆明理工大学 | Parameter extraction circuit for broadcast supervision receiver and parameter extraction method thereof |
-
2015
- 2015-08-28 CN CN201520665254.5U patent/CN205017312U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656363A (en) * | 2016-12-02 | 2017-05-10 | 昆明理工大学 | Parameter extraction circuit for broadcast supervision receiver and parameter extraction method thereof |
| CN106656363B (en) * | 2016-12-02 | 2020-07-31 | 昆明理工大学 | Parameter extraction circuit of broadcast monitoring receiver and parameter extraction method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160203 Termination date: 20180828 |