CN214480567U - Ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device - Google Patents
Ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device Download PDFInfo
- Publication number
- CN214480567U CN214480567U CN202120698365.1U CN202120698365U CN214480567U CN 214480567 U CN214480567 U CN 214480567U CN 202120698365 U CN202120698365 U CN 202120698365U CN 214480567 U CN214480567 U CN 214480567U
- Authority
- CN
- China
- Prior art keywords
- module
- frequency
- signals
- signal
- amplification module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides an integrative experimental apparatus that receives of ultrashort wave frequency modulation amplitude modulation, include: the device comprises a receiving antenna module, a seven-order band-pass filter module, a high-frequency amplification module, a mixer module, a medium-frequency amplification module, a middle-period module, an envelope detection module, an audio power amplification module and a loudspeaker. The receiving antenna module, the seven-order band-pass filter module, the high-frequency amplification module, the mixer module, the intermediate-frequency amplification module, the middle-period module, the envelope detection module and the audio power amplification module are sequentially connected in a wired mode. If the frequency modulation signal is received, the middle-period module plays a role of slope frequency discrimination; the mid-cycle module functions as a filter if an amplitude modulated wave is received. The utility model discloses but the device frequency modulation ripples also can receive amplitude modulation ripples.
Description
Technical Field
The utility model belongs to the technical field of the radio wave, especially, relate to an integrative receiving experiment device of ultrashort wave frequency modulation amplitude modulation.
Background
As the broadcasting industry has developed, there are many different frequencies of radio waves in the sky. If all of these waves are received, signals of many frequencies are mixed together, and the desired signal cannot be received accurately. In order to try to select the desired signal, a selection circuit is provided after the receiving antenna, which is used to select out the desired signal and filter out the unwanted signals in order to avoid interference. The output of the selective circuit is a high-frequency amplitude-modulated signal of a selected radio station, but the high-frequency antenna electric signal obtained from a receiving antenna is generally very weak, a high-frequency amplifier is required to be inserted between the selective circuit and a detector to amplify the high-frequency signal, then the required signal is separated out through detection, and finally the required signal is restored into the original audio signal, the restoring circuit is called demodulation, and the demodulated audio signal is sent to an earphone to receive the broadcast.
SUMMERY OF THE UTILITY MODEL
The utility model provides an integrative experimental apparatus that receives of ultrashort wave frequency modulation amplitude modulation can receive the frequency modulation ripples and also can receive amplitude modulation ripples. The traditional device can not process frequency modulation waves and amplitude modulation waves simultaneously, and the ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device can well solve the problems.
The utility model adopts the technical scheme as follows:
an ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device comprises the following modules: the device comprises a receiving antenna module, a seven-order band-pass filter module, a high-frequency amplification module, a mixer module, a medium-frequency amplification module, a middle-period module, an envelope detection module, an audio power amplification module and a loudspeaker;
the receiving antenna module, the seven-order band-pass filter module, the high-frequency amplification module, the mixer module, the intermediate-frequency amplification module, the middle-period module, the envelope detection module and the audio power amplification module are sequentially connected in a wired mode;
the receiving antenna module is used for receiving and receiving radio wave signals and transmitting the radio wave signals to the seven-order band-pass filter module;
the seven-order band-pass filter module is used for carrying out seven-order band-pass filtering on the radio wave signals to obtain filtered signals and transmitting the filtered signals to the high-frequency amplification module;
the high-frequency amplification module amplifies the filtered signal to obtain an amplified signal and transmits the amplified signal to the mixer module;
the mixer module is used for carrying out mixing processing on the amplified signals to obtain mixed signals, and transmitting the mixed signals to the intermediate frequency amplification module;
the intermediate frequency amplification module filters noise signals in the mixed signals, performs intermediate frequency amplification to obtain intermediate frequency amplified signals, and transmits the intermediate frequency amplified signals to the middle period module;
the middle-period module performs frequency selection on the intermediate-frequency amplified signal to obtain a frequency-modulated amplitude-modulated wave signal, and transmits the frequency-modulated amplitude-modulated wave signal to the envelope detection module;
the envelope detection module carries out processing detection on the frequency modulation amplitude modulation wave signal to obtain a distortion-free modulation audio signal, and transmits the distortion-free modulation audio signal to the audio power amplification module;
the audio power amplification module performs audio amplification on the distortion-free modulated audio signal to obtain an amplified audio signal, and transmits the amplified audio signal to the loudspeaker;
the speaker outputs the amplified audio signal as an audio signal.
The utility model discloses beneficial effect does:
the frequency modulation signal can be received; and 3, unnecessary signals are filtered, and the noise is low.
Drawings
FIG. 1: is a system composition block diagram.
FIG. 2: is a circuit diagram of system implementation.
Detailed Description
To facilitate the understanding and operation of the invention by those skilled in the art, the following detailed description of the invention is provided in connection with the accompanying drawings and the embodiments, it is to be understood that the embodiments described herein are only for the purpose of illustration and explanation, and are not intended to limit the invention.
Fig. 1 is the utility model discloses a system component block diagram of integrative receiving experimental apparatus of ultrashort wave frequency modulation amplitude modulation, include:
the device comprises a receiving antenna module, a seven-order band-pass filter module, a high-frequency amplification module, a mixer module, a medium-frequency amplification module, a middle-period module, an envelope detection module, an audio power amplification module and a loudspeaker;
the receiving antenna module, the seven-order band-pass filter module, the high-frequency amplification module, the mixer module, the intermediate-frequency amplification module, the middle-period module, the envelope detection module and the audio power amplification module are sequentially connected in a wired mode;
the receiving antenna module is used for receiving and receiving radio wave signals and transmitting the radio wave signals to the seven-order band-pass filter module;
the seven-order band-pass filter module is used for carrying out seven-order band-pass filtering on the radio wave signals to obtain filtered signals and transmitting the filtered signals to the high-frequency amplification module;
the high-frequency amplification module amplifies the filtered signal to obtain an amplified signal and transmits the amplified signal to the mixer module;
the mixer module is used for carrying out mixing processing on the amplified signals to obtain mixed signals, and transmitting the mixed signals to the intermediate frequency amplification module;
the intermediate frequency amplification module filters noise signals in the mixed signals, performs intermediate frequency amplification to obtain intermediate frequency amplified signals, and transmits the intermediate frequency amplified signals to the middle period module;
the middle-period module performs frequency selection on the intermediate-frequency amplified signal to obtain a frequency-modulated amplitude-modulated wave signal, and transmits the frequency-modulated amplitude-modulated wave signal to the envelope detection module;
the envelope detection module carries out processing detection on the frequency modulation amplitude modulation wave signal to obtain a distortion-free modulation audio signal, and transmits the distortion-free modulation audio signal to the audio power amplification module;
the audio power amplification module performs audio amplification on the distortion-free modulated audio signal to obtain an amplified audio signal, and transmits the amplified audio signal to the loudspeaker;
the speaker outputs the amplified audio signal as an audio signal.
The receiving antenna module is composed of a receiving antenna ANT.
The seven-order band-pass filter module comprises capacitors C1-C7 and inductors L1-L5. The seven-order band-pass filter performs band-pass filtering on the signals received by the receiving antenna, and ensures that the signals of 118MHz-136MHz can enter the triode.
The seven-order band-pass filter module comprises a non-polar capacitor C1, a non-polar capacitor C2, a non-polar capacitor C3, a non-polar capacitor C4, a non-polar capacitor C5, a non-polar capacitor C6, a non-polar capacitor C7, an inductor L1, an inductor L2, an inductor L3, an inductor L4 and an inductor L5. One end of the non-polar capacitor C6 is connected to the antenna, the other end of the non-polar capacitor C6 is connected to non-polar capacitors C1 and C2, a capacitor C1 is connected to an inductor L1 in parallel, one end of the capacitor C6 is connected to the capacitor C6, the other end of the capacitor C2 is connected to the inductor L2, the other end of the capacitor L2 is connected to capacitors C3 and C4, a capacitor C3 is connected to the inductor L3 in parallel, one end of the capacitor C2 is connected to the inductor L2, the other end of the capacitor C4 is connected to the capacitor C3, the other end of the capacitor C4 is connected to the inductor L4, the other end of the capacitor L4 is connected to capacitors C4 and C4, the capacitor C4 is connected to the inductor L4 in parallel, one end of the capacitor C4 is connected to the inductor L4, the other end of the capacitor C4 is connected to the ground, and the other end of the resistor R4 in the high-frequency amplification module is connected to the high-frequency amplification module.
The high-frequency amplification module comprises a chip 2SC3355 and a peripheral circuit. And attenuating other useless signals to the maximum extent, and amplifying the filtered signals.
The high-frequency amplification module comprises a resistor R1, a resistor R2, a triode Q1, a capacitor C8 and a +8V power supply. One end of the resistor R1 is connected with a +8V power supply, the other end of the resistor R1 is connected with a pin 2 of the triode Q1 and a resistor R2, a pin 1 of the triode Q1 is connected with the other end of the resistor R2, a pin 3 is grounded, one end of the capacitor C8 is connected with a pin 2 of the triode Q1, and the other end of the capacitor C8 is connected with a pin 1 of a chip NE602 in the mixer module.
The mixing module includes chip NE602 and peripheral circuitry. The NE602 is internally provided with a voltage-controlled oscillator, the frequency of the voltage-controlled oscillator is changed due to the change of the junction capacitance of the varactor diode, the frequency can cover about 120MHz-150MHz, and the signals of 118MHz-136MHz can be ensured to be completely covered due to the suppression of a band-pass filter. The signals mixed by the NE602 are applied to a 10.7MHz ceramic filter to remove unwanted signals resulting from the mixing.
The mixer module comprises a resistor R3, a resistor R4, a resistor R5, a variable resistor R6, a resistor R7, a resistor R8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a polar capacitor C14, a capacitor C16, an inductor L6, a varactor D2 and a chip NE 602. One end of the resistor R5 is connected with a pin 1 of the chip NE602, the other end of the resistor R5 is connected with a pin 2 of the chip NE602, one end of the capacitor C11 is connected with the pin 2 of the chip NE602, the other end of the capacitor C11 is grounded, one end of the resistor R4 is connected with a +8V power supply, the other end of the resistor R6 is connected with a pin 1 of the variable resistor R6, one end of the resistor R7 is connected with a pin 2 of the variable resistor R6, the other end of the resistor R6 is grounded, a pin 3 of the polar capacitor C14 is connected with the anode of the polar capacitor C14, one end of the capacitor C16 is connected with a pin 3 of the variable resistor R6, the other end of the capacitor R8 is grounded, one end of the resistor R6 is connected with a pin 3 of the variable diode D2, the other end of the variable diode D2 is grounded, one end of the capacitor C12 is connected with a non-grounded, the non-grounded end of the variable diode D2, the other end of the variable diode L6, the other end of the inductor L6 is grounded, one end of the capacitor C13 is connected with a non-grounded, one end of the inductor L6, and the other end of the inductor L-D13 is connected with a pin 6 of the ground, the resistor R3 and the capacitor C9 are connected in parallel, one end of the resistor R3 is grounded, the other end of the resistor R9 is connected with the pin 7 of the chip NR602, one end of the capacitor C10 is connected with the pin 6 of the chip NE602, the other end of the capacitor C10 is connected with the pin 7 of the chip NE602, and the pin 8 of the chip NE602 is connected with a +8V power supply.
The intermediate frequency amplification module comprises chips of crystal oscillators Y1 and MC1350 and peripheral circuits. The signal is further amplified at intermediate frequency.
The intermediate frequency amplification module comprises a chip MC1350, a resistor R9, a resistor R10, a resistor R12, a capacitor C18, a capacitor C19, a capacitor C17, a triode Q2 and a crystal oscillator Y1. Pin 3 and pin 7 of the chip MC1350 are grounded, one end of a capacitor C18 is connected with pin 6 of the chip MC1350, the other end of the capacitor C19 is grounded, one end of the capacitor C19 is connected with pin 5 of the chip MC1350, the other end of the capacitor C12 is grounded, one end of a resistor R12 is connected with pin 1 of the chip MC1350, the other end of the resistor R12 is connected with pin 8 of the chip MC1350, pin 2 of the chip MC1350 is connected with a +8V power supply, pin 1 of a crystal oscillator Y1 is connected with pin 1 of a triode Q2, the other end of the resistor R4935 is connected with pin 4 of a chip NE602 in the frequency mixing module, one end of the resistor R9 is connected with pin 1 of a triode Q2, the other end of the resistor R10 is connected with pin 2 of a triode Q2, the other end of the resistor R17 is connected with pin 2 of the chip MC1350 in the middle module, one end of the capacitor C17 is connected with pin 2 of the triode Q2, and pin 3 of the triode Q2 is grounded.
The middle-cycle module is composed of a middle-cycle transformer T1 and peripheral elements. If the received frequency-modulated signal is a frequency-modulated signal, the middle period (the center frequency is 10.7MHz) plays a role of slope frequency discrimination; the middle period (center frequency 10.7MHz) acts as a filter if amplitude modulated waves are received. Thus, the device can be used for frequency modulation wave and amplitude modulation wave.
The middle-cycle module includes a middle-cycle transformer T1. Pin 1 of the middle transformer T1 is connected with pin 1 of a chip MC1350 in the intermediate frequency amplification module, pin 2 of T1 is connected with a +8V power supply, pin 3 is grounded, and pin 4 is connected with the anode of a diode D1 of the envelope detection module.
The envelope detection module is composed of a diode D1 and detects a modulation signal without distortion from the amplitude modulation wave.
The envelope detection module comprises a diode D1, a resistor R11 and a capacitor C15. The anode of the diode D1 is connected with the pin 4 of the middle transformer T1 in the middle module, the cathode is connected with one end of a resistor R11, the other end of the resistor R11 is grounded, one end of a capacitor C15 is grounded, and the other end of the capacitor C15 is connected with the non-grounded end of the resistor R11.
The audio power amplification module consists of a chip RC4558D and surrounding elements, and the RC4558D operational amplifier has two groups of audio signal amplification, one group is input by a pin 2 and 3 and output by a pin 1. The other set is 5, 6 pin input, 7 pin output. The 4-pin and 8-pin power supplies are positive and negative power supplies. The audio signal is amplified and then sent to a speaker for output.
The audio power amplification module comprises a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C20 and a chip RC 4558D. Pin 3 of the chip RC4558D is connected with a non-grounding end of a capacitor C15 in the envelope detection module, pin 2 is connected with a resistor R16, the other end of the resistor R16 is grounded, pin 4 of the chip RC4558D is grounded, pin 8 is connected with a +8V power supply, pin 1 is connected with one end of a resistor R15, the other end of the resistor R15 is grounded, one end of the resistor R14 is connected with the non-grounding end of the resistor R16, the other end of the resistor R15 is connected with the non-grounding end of the resistor R15, one end of the resistor R13 is connected with pin 1 of the chip RC4558D, the other end of the resistor R13 is connected with one end of the capacitor C20, and the other end of the capacitor C20 is grounded.
It should be understood that the above-mentioned embodiments are only used for describing the present invention, and are not intended to limit the scope of the present invention, and those skilled in the art can substitute or modify the above-mentioned embodiments without departing from the scope of the present invention.
Claims (2)
1. The utility model provides an integrative experimental apparatus that receives of ultrashort wave frequency modulation amplitude modulation which characterized in that: the device comprises a receiving antenna module, a seven-order band-pass filter module, a high-frequency amplification module, a mixer module, a medium-frequency amplification module, a middle-period module, an envelope detection module, an audio power amplification module and a loudspeaker;
the receiving antenna module, the seven-order band-pass filter module, the high-frequency amplification module, the mixer module, the intermediate-frequency amplification module, the middle-period module, the envelope detection module and the audio power amplification module are sequentially connected in a wired mode.
2. The ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device as claimed in claim 1, wherein the receiving antenna module is used for receiving and receiving radio wave signals and transmitting the radio wave signals to the seven-order band-pass filter module;
the seven-order band-pass filter module is used for carrying out seven-order band-pass filtering on the radio wave signals to obtain filtered signals and transmitting the filtered signals to the high-frequency amplification module;
the high-frequency amplification module amplifies the filtered signal to obtain an amplified signal and transmits the amplified signal to the mixer module;
the mixer module is used for carrying out mixing processing on the amplified signals to obtain mixed signals, and transmitting the mixed signals to the intermediate frequency amplification module;
the intermediate frequency amplification module filters noise signals in the mixed signals, performs intermediate frequency amplification to obtain intermediate frequency amplified signals, and transmits the intermediate frequency amplified signals to the middle period module;
the middle-period module performs frequency selection on the intermediate-frequency amplified signal to obtain a frequency-modulated amplitude-modulated wave signal, and transmits the frequency-modulated amplitude-modulated wave signal to the envelope detection module;
the envelope detection module carries out processing detection on the frequency modulation amplitude modulation wave signal to obtain a distortion-free modulation audio signal, and transmits the distortion-free modulation audio signal to the audio power amplification module;
the audio power amplification module performs audio amplification on the distortion-free modulated audio signal to obtain an amplified audio signal, and transmits the amplified audio signal to the loudspeaker;
the speaker outputs the amplified audio signal as an audio signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120698365.1U CN214480567U (en) | 2021-04-07 | 2021-04-07 | Ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120698365.1U CN214480567U (en) | 2021-04-07 | 2021-04-07 | Ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214480567U true CN214480567U (en) | 2021-10-22 |
Family
ID=78178109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120698365.1U Expired - Fee Related CN214480567U (en) | 2021-04-07 | 2021-04-07 | Ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214480567U (en) |
-
2021
- 2021-04-07 CN CN202120698365.1U patent/CN214480567U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110350932B (en) | High-frequency broadband receiver and signal processing method | |
| CN204044354U (en) | High receiving sensitivity broadband receiver | |
| CN210225363U (en) | Band-pass filter, receiver and communication device | |
| US20010024450A1 (en) | Method for forming an intermediate frequency signal in a mixer, and a mixer | |
| CN103354468A (en) | L-band upconverter and upconversion method in bandwidth of 1.2GHz | |
| CN214480567U (en) | Ultrashort wave frequency modulation and amplitude modulation integrated receiving experimental device | |
| CN102545785A (en) | Noise suppression circuit and method for frequency modulator | |
| CN113114113A (en) | Frequency signal generating circuit and method based on double-frequency wireless power supply | |
| US3671884A (en) | Improved amplifying circuit | |
| CN107786226A (en) | A kind of double frequency Vehicular intercom | |
| CN206559337U (en) | A kind of very high frequency(VHF) FM receiver | |
| JP4166692B2 (en) | Noise reduction device and carrier reproduction device | |
| CN206472125U (en) | A kind of low-cost wireless receiver | |
| CN210867600U (en) | Low-noise amplifier for ground signal transmission | |
| CN212278219U (en) | Debugging-free discrete component wireless microphone wireless audio transmitting circuit | |
| CN210867603U (en) | Low noise amplifier for frequency selection of full frequency band | |
| CN1110855A (en) | Satellite receiving tuner | |
| CN107959509A (en) | A kind of receiver for gis mobile terminals | |
| CN210780728U (en) | Frequency spectrum joint tuning local oscillator circuit | |
| CN212275960U (en) | Signal disturbance extraction circuit and radio frequency receiver | |
| CN213152011U (en) | Vehicle-mounted radio signal amplifying circuit based on automatic AGC gain control | |
| CN211406018U (en) | Radio frequency processing circuit for functional mobile phone | |
| CN111224683B (en) | Low-noise large dynamic radio frequency receiving channel | |
| CN202634684U (en) | Frequency modulator having noise suppression circuit | |
| CN210807238U (en) | FM demodulation system capable of automatically tracking carrier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211022 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |