Cov txheej txheem:
- Kauj ruam 1: Txoj kev xav
- Kauj ruam 2: Schematic Daim duab
- Kauj Ruam 3: Luam Circuit Board
- Kauj Ruam 4: Tus Oscillator Hauv Zos
- Kauj ruam 5: Sib dhos
- Kauj Ruam 6: Kev Ua Tau Zoo
Video: All-Band Direct Conversion Receiver: 6 Kauj Ruam
2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:27
Cov Lus Qhia no piav qhia qhov kev sim "Kev Hloov Pauv Hloov Tshiab" txhua tus qhab-nees txais rau kev txais tos ntawm ib sab-qhab, lej lej, thiab xov tooj cua xov tooj cua qhia txog 80MHz. Kev hloov kho cov kab hluav taws xob tsis xav tau!
Qhov haujlwm siab no tsim los ntawm kuv thawj Kev Qhia
Lub tswv yim rau tus neeg txais khoom no tau tshaj tawm thawj zaug xyoo 2001: "Cov khoom ntsuas thiab cov txheej txheem rau", Patent US6230000 B1, Tsib Hlis 8, 2001, Daniel Richard Tayloe,
Kauj ruam 1: Txoj kev xav
Cov kab hluav taws xob saum toj no qhia pom qhov hloov pauv, tus tiv thaiv, thiab lub tshuab hluav taws xob txuas nrog hauv kab.
AC (hloov pauv tam sim no) kev pom
Yog tias peb kaw qhov hloov pauv thiab siv AC teeb liab rau cov lus tawm, AC qhov hluav taws xob yuav tshwm sim thoob plaws lub tshuab hluav taws xob, qhov dav uas yuav txo qis nrog nce ntau zaus vim qhov faib hluav taws xob ua haujlwm.
Qhov tshwj xeeb txaus siab rau peb yog qhov zaus uas AC voltage hla lub capacitor poob mus rau 70% ntawm cov tswv yim. Qhov zaus no, hu ua "kev txiav tawm zaus", tshwm sim thaum lub reactance Xc ntawm lub capacitor sib npaug rau qhov tsis kam R. Cov zaus ntau dua qhov txiav tawm zaus raug txo qis ntawm tus nqi 6dB/octave.
Qhov kev txiav tawm zaus rau kuv lub Circuit Court tau teeb tsa rau 3000Hz uas txhais tau tias tsis muaj AC tso tawm rau tshaj tawm zaus thiab saum toj no.
DC (ncaj qha tam sim no) kev pom
Yog tias peb kaw qhov hloov pauv thiab siv DC qhov hluav taws xob rau qhov nkag, lub capacitor yuav pib them rau tus nqi ntawd. Peb puas yuav tsum qhib qhov hloov pauv ua ntej lub capacitor tau them tag ces qhov hluav taws xob hla C yuav nyob ruaj khov mus txog thaum qhov hloov pauv tau kaw dua.
Tau txais lub teeb liab ntau zaus
Tam sim no cia peb dhau lub teeb liab ntau dhau los ntawm qhov hloov pauv uas tau qhib thiab kaw xws li qhov ib feem ntawm cov teeb liab nkag tau nthuav tawm rau RC network tau piav qhia saum toj no. Txawm hais tias lub teeb liab nkag los tau zoo dua qhov txiav tawm ntawm 3000Hz, lub tshuab hluav taws xob ib txwm tau nthuav tawm nrog tib lub tshuab hluav taws xob DC tsis sib xws thiab yuav them tus nqi nruab nrab ntawm qhov kev hloov pauv ntawd.
Yuav tsum lub teeb liab tuaj txawv me ntsis los ntawm qhov hloov pauv zaus lub capacitor yuav pib them thiab tso tawm thaum nws ntsib qhov sib txawv ntawm cov teeb liab nkag. Yog tias qhov sib txawv ntawm qhov sib txawv yog, hais, 1000Hz ces peb yuav hnov lub suab ntawm 1000Hz hla lub capacitor. Qhov dav ntawm lub suab no yuav tawm sai sai thaum qhov sib txawv ntau tshaj qhov txiav tawm zaus (3000Hz) ntawm RC network.
Ntsiab lus
- Qhov hloov pauv hloov txiav txim siab qhov tau txais.
- Kev sib xyaw ua ke RC txiav txim siab lub suab nrov tshaj plaws uas tuaj yeem hnov.
- Yuav tsum tau ua kom nrov nrov vim tias cov lus qhia tawm yog tsis muaj zog heev (microvolts)
Kauj ruam 2: Schematic Daim duab
Cov Circuit Court saum toj no muaj ob qhov hloov pauv RC (resistor - capacitor) tes hauj lwm. Yog vim li cas rau ob lub network yog tias txhua qhov kev hloov pauv tau muaj qhov zoo-voltage wavehape thiab qhov tsis zoo-voltage wavehape.
Thawj lub network suav nrog R5, hloov 2B2, thiab C8 … lub network thib ob suav nrog R5, hloov 2B3, thiab C9.
Qhov sib txawv amplifier IC5 suav qhov ua tau zoo thiab tsis zoo los ntawm ob lub network thiab dhau lub teeb liab los ntawm C15 mus rau "lub suab tso tawm" davhlau ya nyob twg ntawm J2.
Tsim cov zauv rau R5, C8 thiab R5, C9:
XC8 = 2R5 qhov twg XC8 yog qhov muaj peev xwm ua tau zoo 1/(2*pi*cutoff-freq*C8)
Qhov tseem ceeb ntawm 50 ohms thiab 0.47uF tsim qhov txiav tawm ntawm 3000Hz
Qhov laj thawj rau 2*tus lej sib npaug yog tias lub teeb liab nkag tau tsuas yog nthuav tawm rau txhua lub network rau ib nrab ntawm lub sijhawm uas ua tau zoo ob npaug rau lub sijhawm tas li.
Tsim cov zauv rau R7, C13
XC13 = R7 qhov twg XC13 yog qhov muaj peev xwm ua tau zoo 1/(2*pi*cutoff-freq*C13). Lub hom phiaj ntawm lub network no yog txhawm rau txo qis cov teeb liab thiab suab nrov.
Lub Suab Amplifier:
Lub suab nce ntawm op-amp IC5 tau teeb tsa los ntawm qhov sib piv ntawm R7/R5 uas sib npaug rau qhov nce hluav taws xob ntawm 10000/50 = 200 (46dB). Txhawm rau kom tau txais qhov txiaj ntsig R5 tau txuas nrog qhov tsis muaj qhov cuam tshuam tsawg ntawm RF (xov tooj cua zaus) lub tshuab hluav taws xob IC1.
RF Amplifier: Cov
Qhov nce qhov hluav taws xob ntawm IC1 tau teeb tsa los ntawm qhov sib piv ntawm R4/R3 uas sib npaug rau 1000/50 = 20 (26dB) muab tag nrho cov txiaj ntsig nce mus txog 72dB uas haum rau mloog lub taub hau xov tooj.
Cov Logic Circuits:
IC4 ua raws li qhov tsis-amplifier nruab nrab ntawm 3 volt ncov-rau-ncov teeb liab los ntawm cov synthesis thiab 5 volt logic rau IC2. Qhov tsis ua kom lub suab nrov tau nce ntawm 2 uas tau teeb tsa los ntawm qhov sib piv ntawm resistors R6/R8.
IC2B yog xaim raws li kev faib ua ob. Qhov no ua kom ntseeg tau tias cov capacitors C8 thiab C9 txuas nrog R5 rau qhov sib npaug ntawm lub sijhawm.
Kauj Ruam 3: Luam Circuit Board
Sab saum toj thiab hauv qab pom ntawm lub rooj tsav xwm hauv ntej thiab tom qab nws tau sib sau ua ke.
Ib txheej tag nrho ntawm cov ntaub ntawv Gerber suav nrog hauv cov ntawv zip txuas. Txhawm rau tsim koj tus kheej PCB yooj yim xa cov ntawv no mus rau cov chaw tsim khoom lag luam hauv Circuit Court … tau txais nqe tsub thawj vim tus nqi sib txawv.
Kauj Ruam 4: Tus Oscillator Hauv Zos
Tus neeg txais khoom no siv cov khoom siv hluavtaws piav qhia hauv
Cov ntawv txuas nrog "ncaj qha hloov pauv-tus txais txais. Txt" muaj tus lej *.ino rau tus neeg txais no.
Txoj cai no yuav luag zoo ib yam rau tus lej rau qhov sib xyaw ua ke saum toj no tshwj tsis yog tias qhov tso zis ntau zaus yog ob zaug ntawm cov zaub tso tawm kom tso cai rau faib-los-ob Circuit Court ntawm lub rooj txais.
2018-04-30
Thawj txoj cai hauv.ino hom ntawv txuas nrog.
Kauj ruam 5: Sib dhos
Lub yees duab tseem ceeb qhia yuav ua li cas txhua yam cuam tshuam nrog.
SMD's (cov khoom siv saum npoo av) tau xaiv raws li koj tsis xav tau ntev ua thaum hloov pauv ntawm 80MHz. 0805 SMD cov khoom tau raug xaiv los ua tes yooj yim dua.
Thaum nyob ntawm qhov teeb meem ntawm kev xuas tes ua nws yog ib qho tseem ceeb kom yuav cov hlau tswj qhov kub thiab txias vim tias cov cua sov ntau dhau yuav ua rau cov kab hluav taws xob PCB nce. Kuv siv 30W ntsuas kub tswj cov kav hlau. Qhov zais cia yog siv ntau cov kua dej ntws tawm. Ua kom sov qhov kub kom txog thaum tus laug tsuas yog yaj. Tam sim no siv cov laug rau ib lub ncoo, thiab nrog cov hlau txuas tseem nyob ntawm lub ncoo, xaub tus 0805 tiv thaiv cov hlau txuas uas siv ob tus tweezers. Thaum cov khoom siv raug tso rau qhov raug tshem tawm cov hlau txuas. Tam sim no txuas qhov seem ntxiv tom qab ntawd ntxuav koj txoj haujlwm nrog Isopropyl alchohol uas muaj los ntawm koj tus kws tshuaj hauv nroog.
Kauj Ruam 6: Kev Ua Tau Zoo
Kuv tuaj yeem hais dab tsi … nws ua haujlwm !!
Kev ua tau zoo tshaj plaws yog tau txais kev siv lub suab-impedance resonant antenna rau cov qhab nyiam.
Hloov chaw ntawm lub mloog pob ntseg Kuv tau ntxiv 12 volt audio amplifier thiab hais lus. Lub suab ua ntej lub tshuab hluav taws xob muaj nws tus kheej inbuilt tus tswj hwm lub zog txhawm rau txo txoj hauv kev ntawm ib hom kev tawm tswv yim voj los ntawm 12 volt roj teeb.
Cov vis dis aus txuas nrog tau txais kev siv lub voj nyob sab hauv tsev ntawm cov xov hlau kwv yees li 2 meters txoj kab uas hla. Qhov nruab nrab ntawm lub voj tau dhau los ntawm ib lub qhov ntawm ob lub qhov ferrite tub ntxhais nrog 10 tig thib ob txuas nrog ntawm hauv av thiab cov neeg txais cov tswv yim.
Nyem qhov no mus saib kuv lwm cov ntawv qhia.
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