Me Me UHF Tracker Transmitter: 5 Kauj Ruam (nrog Duab)

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:29

Nov yog lub voj voog me me uas tuaj yeem siv los taug qab cov khoom mus txog 400m.

Nws yog qhov tseem ceeb SAW ruaj khov OOK hloov kho RF transmitter. Qhov kev hloov pauv tau ua tiav nrog ob qhov qis zaus ultra -low power oscillators uas qhib lub tshuab xa hluav taws xob txhua ob vib nas this rau lub sijhawm luv.

Nrog cov teeb pom ntawm no kuv tau nce mus txog 400m ntau. Kev siv tam sim no yog kwv yees li 180uA qhov nruab nrab yog li nws yuav ua haujlwm ob peb hnub nrog khawm me me ntawm tes. Zaus 915MHz.

Kauj ruam 1: Circuit Court

Thawj tus oscillator mus rau sab laug ua haujlwm thib ob rau nws sab xis txhua 2 vib nas this lossis li ntawd. Qhov thib ob oscillates ntawm 800 txog 900Hz. Nws cov teeb liab tso tawm modulates RF transmitter uas yog qhov tseem ceeb tsuas yog SAW raws li oscillator nrog qee qhov RF zog ua ke rau tus kav hlau txais xov nplawm.

Kev hloov kho ntawm RF oscillator tuaj yeem nyuaj tab sis ua haujlwm tau zoo nrog cov khoom siv pom ntawm no. Lub jumper resistor hla SAW lub ntsiab tso cai rau hloov kho qhov nyob ze ntawm SAW qhov yooj yim zaus, tom qab ntawd lub jumper raug tshem tawm thiab cov Circuit Court yuav oscillate ntawm SAW zaus.

Qhov qis dua koj mus hauv qhov yooj yim qhov kev hloov pauv no yuav yog, yog li koj tuaj yeem mus rau 433MHz piv txwv ib yam nkaus. Cov khoom siv uas yuav hloov pauv yuav yog tus inductor ces (txog 22nH).

Siv NPO lub kaus mom rau thaj chaw RF. Hom ntawm tus inductor tsis yog qhov tseem ceeb, Kuv siv cov nplais.

Lub Circuit Court yuav tau txais txiaj ntsig zoo los ntawm theem tsis sib xws lossis cov khoom sib txuas ntawm cov kav hlau txais xov, tab sis qhov tseeb kuv tsis poob zoo li nqis peev ntau lub sijhawm hauv nws.:-) Yog tias koj xav sim, kuv ntxiv daim duab nrog lub voj voog sib piv rau 433MHz uas ua haujlwm tau zoo, Tus inductor rau oscillator hloov mus txog 22nH hauv qhov xwm txheej ntawd.

(Yog tias koj nyem rau ntawm daim duab ob zaug thiab tom qab ntawd "thawj daim ntawv DIY" hauv qab daim duab qis nws yuav qhib hauv hi-res.)

Kauj ruam 2: Tsim

Lub tsev nws yuav tsum muaj cov ntawv kub thiab cov tshuaj txhuam los sis cov hlau txuas nrog cov lus qhia zoo thiab khov kho tes.

Ua koj tus kheej PCB txheej txheem lossis rub kuv li ntawm no: Google txuas txuas Cov no yog cov ntaub ntawv EAGLE, Schematic thiab BOM kuj suav nrog.

Tshaj tawm.brd cov ntaub ntawv rau koj nyiam PCB chaw tsim khoom pheej yig, kuv siv Oshpark.com, yuav siv sijhawm li ob rau peb lub lis piam thiab tom qab ntawd:

1. Muab cov tshuaj txhuam txhuam tso rau ntawm txhua lub ncoo ib feem uas yuav muab tso rau

2. Muab tag nrho cov khoom siv

3. Ua kom sov tag nrho lub rooj tsavxwm ntawm lub laujkaub kub thiab tos kom txog thaum cov tshuaj txhuam cov kua ua kua

4. Tshem lub rooj tsavxwm daim ntawv phaj kub, cia kom txias

5. Tig lub rooj tsavxwm ib puag ncig thiab muab lub roj teeb tuav rau nws

6. Siv lub kav hlau txais xov xaim rau hauv lub qhov

7. Tseem ceeb: Muab qee cov txheej txheem zoo lossis silicon thiab lwm yam ntawm sab tivthaiv. Qhov no yuav tiv thaiv lub Circuit Court los ntawm kev sib kis thiab av noo. LF oscillators siv cov txiaj ntsig zoo tiv taus, uas txhais tau tias lawv yooj yim raug tshem tawm yog tias piv txwv li koj muab koj tus ntiv tes rau nws.

Kauj Ruam 3: Ntau Yam thiab Kev Ruaj Ntseg

RF zaus yog SAW ruaj khov yog li yuav tsum tsis txhob txav mus. Kuv tsis tau sim qhov Circuit hauv qhov xwm txheej phem, tab sis nws ua haujlwm tau zoo los ntawm chav sov mus rau rho tawm 15C.

Qhov ntau yog kwv yees li 400m kab-ntawm-pom (qhov ntawd puas nkag siab qhov xwm txheej no?:-))

Koj tuaj yeem ua si ib puag ncig nrog lub kav hlau txais xov ntev thiab tseem sim ua kom thaj av ntxiv qee cov khoom siv coj mus rau GND tus pin ntawm lub roj teeb tuav piv txwv. Cov hlau ntsuab luv luv tau nce ntau yam hauv kuv rooj plaub.

Kauj ruam 4: Txais

Tus txais tau suav nrog YAGI tus kav hlau txais xov, tus kho kom haum thiab tus txais RTL-SDR.

RTL-SDR dongle txuas nrog lub xov tooj ntawm tes uas ua haujlwm them nyiaj hu ua RF analyzer. Nws tsis kim.

Yog tias koj nce lub kav hlau txais xov ntawm lub tsheb piv txwv tias dongle tuaj yeem txuas nrog lub Windows PC tab sis, thiab muaj software dawb muaj rau Windows.

YAGI tus kav hlau txais xov tsim los ntawm no:

Muaj ntau ntau qhov kev tsim qauv hauv net thiab koj tseem tuaj yeem yuav lub kav hlau txais xov.

RTL-SDR dongle los ntawm no:

Nws yog qhov muaj txiaj ntsig zoo tshaj plaws thiab muaj txiaj ntsig zoo rau lub sijhawm RF Hobbyist, thiab nws tus nqi tsis txaus ntseeg.

Tus attenuator yog ua los ntawm lub thawv thaiv nrog peb lub DPDT hloov thiab txo qis 10dB rau txhua theem. Siv cov tshuaj tiv thaiv me me thiab kev sib txuas luv. Nws qhov kev ua tau zoo ntawm cov zaus no kuv tsis xav tias zoo li kev ntsuas tab sis nws ua rau tus lej zoo thiab qhov ntawd yog txhua qhov suav. Kuv tsis tau siv lub vev xaib tshwj xeeb rau ntu no yog li koj yuav tsum saib qhov no rau koj tus kheej. Tshawb nrhiav Yuav Ua Li Cas-Tos ntawm RF attenuators nrog resistors.

Kauj Ruam 5: Pom Nws Hauv Kev Ua

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