CN203166983U - Crystal oscillator frequency modulation system of DMR communication - Google Patents
Crystal oscillator frequency modulation system of DMR communication Download PDFInfo
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- CN203166983U CN203166983U CN 201320096719 CN201320096719U CN203166983U CN 203166983 U CN203166983 U CN 203166983U CN 201320096719 CN201320096719 CN 201320096719 CN 201320096719 U CN201320096719 U CN 201320096719U CN 203166983 U CN203166983 U CN 203166983U
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- dmr
- frequency
- crystal oscillator
- baseband processor
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Abstract
The utility model provides a crystal oscillator frequency modulation system of DMR communication, comprising a transmitter module and a reception module. The transmitter module comprises a MCU controller, a transmitter modulator, an amplifier, a converter and an antenna connected in sequence. The reception module comprises a DMR baseband processor, a frequency detector, a mixer, a converter and an antenna connected in sequence with the MCU controller, wherein a local oscillator modulator is connected between the mixer and the MCU controller. The DMR baseband processor is respectively connected with the transmitter modulator and the local oscillator modulator through a crystal oscillator modulator. A 13 MHz VC-TCXO oscillator is used in the crystal oscillator modulator. The system uses a dual-chip structure as a device for transmitting and outputting local oscillator signal frequency, and combining with the DMR baseband processor and the VC-TCXO oscillator, software is preferably used to modulate frequency offset to be consistent according to different radio frequency, thereby having effect of providing stable frequency signals and satisfying requirements of different expansibility.
Description
Technical field
The utility model relates to the wireless communication technique field, and what especially relate to is a kind of crystal oscillator frequency modulation system of DMR communication.
Background technology
At present, field of wireless communication in China, for example intercom market remains with analog technology mostly as leading, but it exists part not enough, at first signal processing mode is too simple, and consumed power is bigger, can not preferably eliminate and disturb and The noise, the utilance of its secondary frequencies is not high, channel capacity is low, and confidentiality is poor, is easily eavesdropped.At these deficiencies, the digital radio mechanics of communication appears on the market, it has strong interference immunity, speech quality is good, frequency efficiency is high, but has certain defective, and is more single in Frequency Band Selection, and there is debug difficulties in circuit design, and the cost height aspect frequency modulation, can not be adjusted flexibly, design flexibility is lower, and then can not satisfy the demand of different autgmentabilities.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of crystal oscillator frequency modulation system that adopts the DMR communication of twin-core sheet binding crystal single-point modulation is provided.
For achieving the above object, technical solution of the present utility model is: a kind of crystal oscillator frequency modulation system of DMR communication, comprise transmitter module and receiver module, described transmitter module comprises the MCU controller, transmit modulator, amplifier, transducer is connected successively with antenna, receiver module comprises the DMR baseband processor that is connected successively with the MCU controller, frequency discriminator, frequency mixer, transducer and antenna, wherein also be connected with the local oscillator modulator between frequency mixer and the MCU controller, described DMR baseband processor links to each other with transmit modulator and local oscillator modulator respectively by the crystal oscillator frequency modulator, and the output modulation signal of described DMR baseband processor is through the adjustment end of capacitor-coupled to the crystal oscillator frequency modulator.
Preferably, described crystal oscillator frequency modulator adopts the VC-TCXO oscillator of 13MHz.
Preferably, described DMR baseband processor adopts the HR-C5000 chip.
Preferably, described transmit modulator and local oscillator modulator all adopt the RDA1846S chip.
Preferably, described capacitor is the ceramic condenser of 10uF.
By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: adopt double-chip structure as the output device of emission and local oscillation signal frequency, and be coupled to the frequency of oscillation adjustment end of VC-TCXO oscillator through 10 μ F ceramic condensers in conjunction with the modulation signal of DMR baseband processor output, because of being changed to ± 12PPm of the voltage-controlled oscillating frequency of VC-TCXO oscillator, the control voltage range is 0.5～2.5V.And the intercom transmit frequency range is 400～470MHz, the frequency modulation of signal changes along with the variation of output rf frequency, the signal output amplitude of can well application software adjusting the DMR baseband processor according to different rf frequencies makes it the frequency modulation unanimity in transmit frequency range, play the effect of the frequency signal that provides stable, this stable frequency signal comprises be used to the frequency that transmits and receives local oscillator, the total system circuit design flexibility is strong, debugging is convenient, can satisfy the demand of different autgmentabilities.
Description of drawings
Fig. 1 is system block diagram of the present utility model.
(identify among the figure: 1, MCU control module; 2, DMR baseband processor; 3, transmit modulator; 4, crystal oscillator frequency modulator; 5, local oscillator modulator; 6, amplifier; 7, antenna; 8, transducer; 9, frequency mixer; 10, frequency discriminator; 21, capacitor.）
Embodiment
Further specify the utility model below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the crystal oscillator frequency modulation system of a kind of DMR communication of the present utility model, comprise transmitter module and receiver module, described transmitter module comprises MCU controller 1, transmit modulator 3, amplifier 6, transducer 8 is connected successively with antenna 7, receiver module comprises the DMR baseband processor 2 that is connected successively with MCU controller 1, frequency discriminator 10, frequency mixer 9, transducer 8 and antenna 7, wherein also be connected with local oscillator modulator 5 between frequency mixer 9 and the MCU controller 1, described DMR baseband processor 2 adopts the HR-C5000 chip, described transmit modulator 3 and local oscillator modulator 5 all adopt the RDA1846S chip, transmit modulator 3 is used as signal modulation and radio-frequency transmissions, after connecting, amplifier forms transmission channel with transducer 8 and antenna 7, coordinate DMR baseband processor 2 by MCU controller 1, thereby control signal emission, and local oscillator modulator 5 adopts the RDA1846S that is set to radiation pattern output local oscillation signal, after receiving signal from antenna 7, enter frequency mixer 9 through transducer 8, the local oscillation signal that input signal and local oscillator modulator 5 are sent mixes and generates intermediate-freuqncy signal, through behind the frequency discriminator 10 by DMR baseband processor 2 and MCU controller 1 analyzing and processing after, obtain voice signal, aspect frequency modulation(FM), described DMR baseband processor 2 links to each other with transmit modulator 3 and local oscillator modulator 5 respectively by crystal oscillator frequency modulator 4, and the output modulation signal of described DMR baseband processor 2 is coupled to the adjustment end of crystal oscillator frequency modulator 4 through capacitor 21.Described capacitor 21 is the ceramic condenser of 10uF, described crystal oscillator frequency modulator 4 adopts the VC-TCXO oscillator of 13MHz, in the various high-end devices of being widely applied to of quartz crystal oscillator, also more and more higher to its requirement, VCXO (VCXO), the demand of compensation crystal oscillator (TCXO) and constant-temperature crystal oscillator (OCXO) progressively rises.VCXO can utilize change in voltage to adjust output frequency.VT-TCXO comprises a temperature sense circuit, changing in temperature is to adjust output frequency, the temperature variant deviation of frequency that is output has reduced, thereby makes it keep higher frequency stability in certain temperature range, and general precision requirement making within 0-3PPM is this.Has lower phase noise, precision is higher, it is to keep the stable of crystal temperature effect by the thermostat of inside, be coupled to the frequency of oscillation adjustment end of VC-TCXO oscillator through 10 μ F ceramic condensers by the modulation signal in conjunction with 2 outputs of DMR baseband processor, because of being changed to ± 12PPm of the voltage-controlled oscillating frequency of VC-TCXO oscillator, the control voltage range is 0.5～2.5V.And the intercom transmit frequency range is 400～470MHz, the frequency modulation of signal changes along with the variation of output rf frequency, the signal output amplitude of can well application software adjusting the DMR baseband processor according to different rf frequencies makes it the frequency modulation unanimity in transmit frequency range, plays the effect of the frequency signal that provides stable.
Above-described, only be preferred embodiment of the present utility model, can not limit the scope that this practicality is implemented, every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.
Claims (5)
1. the crystal oscillator frequency modulation system of a DMR communication, comprise transmitter module and receiver module, described transmitter module comprises MCU controller (1), transmit modulator (3), amplifier (6), transducer (8) is connected successively with antenna (7), receiver module comprises the DMR baseband processor (2) that is connected successively with MCU controller (1), frequency discriminator (10), frequency mixer (9), transducer (8) and antenna (7), wherein also be connected with local oscillator modulator (5) between frequency mixer (9) and the MCU controller (1), it is characterized in that: described DMR baseband processor (2) links to each other with transmit modulator (3) and local oscillator modulator (5) respectively by crystal oscillator frequency modulator (4), and the output modulation signal of described DMR baseband processor (2) is coupled to the adjustment end of crystal oscillator frequency modulator (4) through capacitor (21).
2. the crystal oscillator frequency modulation system of a kind of DMR communication according to claim 1 is characterized in that: the VC-TCXO oscillator of described crystal oscillator frequency modulator (4) employing 13MHz.
3. the crystal oscillator frequency modulation system of a kind of DMR communication according to claim 1 is characterized in that: described DMR baseband processor (2) employing HR-C5000 chip.
4. the crystal oscillator frequency modulation system of a kind of DMR communication according to claim 1, it is characterized in that: described transmit modulator (3) and local oscillator modulator (5) all adopt the RDA1846S chip.
5. the crystal oscillator frequency modulation system of a kind of DMR communication according to claim 1, it is characterized in that: described capacitor (21) is the ceramic condenser of 10uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320096719 CN203166983U (en) | 2013-03-04 | 2013-03-04 | Crystal oscillator frequency modulation system of DMR communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320096719 CN203166983U (en) | 2013-03-04 | 2013-03-04 | Crystal oscillator frequency modulation system of DMR communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166983U true CN203166983U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320096719 Expired - Fee Related CN203166983U (en) | 2013-03-04 | 2013-03-04 | Crystal oscillator frequency modulation system of DMR communication |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710093A (en) * | 2018-04-16 | 2018-10-26 | 福建新大陆通信科技股份有限公司 | Improve the calibrating installation and method of frequency converter local frequency consistency |
-
2013
- 2013-03-04 CN CN 201320096719 patent/CN203166983U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710093A (en) * | 2018-04-16 | 2018-10-26 | 福建新大陆通信科技股份有限公司 | Improve the calibrating installation and method of frequency converter local frequency consistency |
| CN108710093B (en) * | 2018-04-16 | 2020-11-13 | 福建新大陆通信科技股份有限公司 | Calibration device and method for improving consistency of local oscillation frequency of frequency converter |
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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: 20130828 Termination date: 20190304 |