Cov kav hlau txais xov lub sijhawm muaj nyob rau hauv chav kawm ntawm cov khoom siv taw qhia. Cov qauv, raws li txoj cai, ua haujlwm ntawm luv nthwv dej. Cov khoom siv feem ntau yog nruab nrog cov khoom siv hluav taws xob zoo heev. Qee qhov kev hloov kho yog ua nrog lub vaj huam sib luag vibrator. Lawv muaj ib los yog ntau tshaj amplifiers. Nws tseem yuav tsum tau muab sau tseg tias muaj cov khoom siv nrog channel transmitters.
Dab tsi yog qhov tseem ceeb ntawm cov kav hlau txais xov log-periodic? Ua ntej tshaj plaws, nws yog ib qho tseem ceeb uas yuav tau xav txog qhov zaus ntawm cov khoom siv. Tsis tas li, cov kws tshaj lij xav txog kev coj ncaj ncees thiab kev nce qib. Lub input impedance kuj cuam tshuam rau qhov tsis muaj ntawm tus kav hlau txais xov.
xam tus qauv
Tus kav hlau txais xov yog xam raws qhov ntev ntawm lub khib. Yog tias peb xav txog cov qauv nrog ib lub vibrator, ces lub reflector yog hom dipole. Nrog rau qhov ntev ntawm 20 cm, qhov dav ntawm lub vaj huam sib luag yuav tsum yog 30 cm. Thaum nce qhov loj ntawm lub khib, lub vaj huam sib luag yog xaiv nrog qhov tsim nyog qhov ntev.
DIY khoom
Ua-nws-koj tus kheej lub cav-lub sijhawm kav hlau txais xov yog folded nrog lub teeb pom kev yooj yim, thiab nws tsim nyog siv lub vibrator nrog ib qho txuas txuas ntxiv. Ua ntej tshaj plaws, lub mast yog muab tso ncaj qha. Racks yog tsau nrog lub tshuab vuam. Cov kws tshaj lij qhia kom nruab lub amplifier tam sim ntawd.
Tshuaj yuav tsum tsuas yog siv nrog av. Ntau hom expanders yog siv los txo qhov zaus. Feem ntau cov qauv ua haujlwm los ntawm kev sib cuag adapters. Upper racks yuav tsum tau siv nrog ib tug me me txoj kab uas hla. Nws kuj tseem yuav tsum tau them sai sai rau qhov qis dua adapter los ntawm cov xaim tawm. Nyob ntawm qhov kev suav ntawm tus qauv, qhov ntev ntawm lub cav-lub sijhawm kav hlau txais xov yog nyob ntawm.
qauv rau ib qho yooj yim txais
Logo-ib lub sijhawm kav hlau txais xov rau cov neeg txais tau yooj yim yog tsim nrog cov masts me. Cov kev hloov kho feem ntau yog suav tias yog peb lub racks. Yog hais tias peb xav txog ib tug kav hlau txais xov nrog ib tug adapter, ces lub reflector yog siv nrog ib tug capacitor. Nws tseem yuav tsum tau muab sau tseg tias lub mast yog tsau rau ntawm lub khib. Lub horn nyob rau hauv cov ntaub ntawv no yog heev tsawg. Adapters ntawm lub kav hlau txais xov yog txuas los ntawm cov tuav. Cov kws tshaj lij hais tias cov qauv nrog dipole adapters yog suav tias yog nrov tshaj plaws. Lawv tuaj yeem ua haujlwm ntawm shortwave.
Single Stand Unit
Ib tus ncej kav hlau txais xov tsis muaj hluav taws xob ntau. Muaj cov khoom siv nrog rov qab vibrators ntawm kev ua lag luam. Lawv muaj lub hauv paus dav dav. Nyob rau hauv cov ntaub ntawv no, cov tuav yog ntsia nrog ib tug me me dav. Yog hais tias peb xav txog tus qauv log-periodic kav hlau txais xov, nws muaj ib tug reflector. Racks yog tsim los ntawm kev kho kev txhawb nqa. Kav hlau txais xov feem ntau muag yam tsis muajcov tuav. Lawv muaj ib tug sawv nrog lub hauv paus dav. Qhov zoo tshaj plaws yog suav hais tias yog cov khoom siv nrog cov khoom siv txuas ntxiv. Vibrators tuaj yeem ntsia tau yam tsis muaj lub adapter. Cov khib nyiab hauv qhov no yog qhov ntev me me.
Ob tus ncej qauv
Lub cav-lub sijhawm UHF kav hlau txais xov nrog ob lub racks yog tsim nrog lub ntsej muag rau peb txoj kab. Cov kws tshaj lij hais tias cov qauv muaj qhov sib txawv conductivity. Thaum xaiv ib qho kev hloov kho, ib tug yuav tsum tau xyuam xim rau kev txhawb nqa ntawm qhov kev hloov kho. Cov tuav tuaj yeem ntsia tau L-shaped. Feem ntau, cov kav hlau txais xov ntawm hom no tau nruab rau ntawm lub ru tsev.
Cov khoom siv tau zoo rau kev txais TV channel. Txawm li cas los xij, lawv tsis muaj peev xwm ua haujlwm ntawm txhua zaus. Nyob rau hauv cov ntaub ntawv no, ntau nyob ntawm seb cov duab ntawm lub reflector. Cov kev hloov kho niaj hnub ntawm cov kav hlau txais xov log-periodic yog siv nrog cov khoom siv tawm suab. Tsuas yog qhib adapters raug ntsia hauv qab lawv. Nyob rau hauv rooj plaub no, cov vibrators yog mounted nyob rau hauv nruab nrab ib feem ntawm lub khib. Masts sib txawv ntawm qhov ntev. Ntau ntau nyob ntawm qhov dav ntawm racks. Lub conductivity ntawm kev hloov kho yog nyob ntawm tus reflector. Cov xaim los ntawm tus kav hlau txais xov yuav tsum tawm ntawm lub expander.
kab rov tav kav hlau txais xov
Kab rov tav log-periodic hom TV kav hlau txais xov sawv tawm nrog qhov dav dav. Ntau tus qauv siv lub mast ntev, thiab cov kev txhawb nqa tsuas yog ua los ntawm aluminium alloy. Yog xav tau, xws li lub kav hlau txais xov ntawm lub log-periodic hom tuaj yeem ua rau nws tus kheej. Nws yog zoo suited rau ib tug receiver ntawm tsawg zog. Cov kws tshaj lij hais tias thawjtus tuav yog queued. Tsuas yog tom qab ntawd tuaj yeem txhim kho mast. Cov kauj ruam tom ntej yog lub reflector. Yog tias peb xav txog kev hloov kho hauv khw, lawv muaj ob lub vibrators.
Cov qauv feem ntau yog ua tsis tau nres. Racks yog nyob rau hauv txoj hauj lwm kab rov tav. Txhawm rau nruab lub kav hlau txais xov log-periodic, dav hlau fasteners yog siv. Nws kuj tseem yuav tsum tau muab sau tseg tias muaj kev hloov kho ntau zaus uas lub amplifier tau teeb tsa. Expanders rau cov cuab yeej raug xaiv tsuas yog rau siab conductivity. Feem ntau ntawm kev ua lag luam muaj cov khoom siv nrog qhov tsis zoo polarity. Ua ntej tshaj plaws, cov kws tshaj lij nco ntsoov tias lawv tsis muaj teeb meem nrog cov nthwv dej luv luv, thiab kev nce siab heev. Qhov ntev ntawm cov kav hlau txais xov log-periodic ncaj qha nyob ntawm tus qauv xam.
Vertical modifications
Vertical log-periodic kav hlau txais xov feem ntau pom hauv khw. Kev suav ntawm tus qauv yog ua raws li qhov ntev ntawm cov khib nyiab. Log-periodic ntsug kav hlau txais xov yog tsim nrog reflectors ntawm txawv conductivity. Cov qauv feem ntau yog ua los ntawm kev sib cuag adapters.
Tsis tas li hauv khw muag khoom koj tuaj yeem nrhiav cov khoom siv yam tsis muaj lub suab nrov. Raws li txoj cai, lawv siv luv luv reflectors, thiab cov vibrators raug ntsia ntawm lub luv-yoj hom. Qhov tsawg kawg nkaus tso cai kav hlau txais xov zaus nyob ntawm ntau yam. Nyob rau hauv cov ntaub ntawv no, tus neeg siv yuav tsum coj mus rau hauv tus account lub tsis kam ntawm lub reflector. Tsis tas li ntawd, koj yuav tsum paub hom expander. Cov qauv feem ntau yog muag nrog cov tswj tsis tu ncua.
144 MHz ntaus ntawv
Logo-periodic kav hlau txais xov ntawm hom no yog tsim los nrog ntev racks, thiab vibrators yog siv nrog kev txhawb nqa. Tus qauv qauv muaj xws li ib tug connector. Amplifiers rau cov kav hlau txais xov log-periodic tau nruab nrog lub zog sib txawv. Tsis tas li ntawd, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias kev hloov pauv txawv ntawm kev coj ua. Qee cov khoom siv tau ua nrog ib lub khib nyiab. Lawv muaj tsawg input impedance. Raws li txoj cai, lawv yog tsim los nrog cov zis vibrator. Cov tuav yog ntsia ntawm qhov siab qis. Yog xav tau, xws li lub kav hlau txais xov ntawm lub log-periodic hom tuaj yeem ua los ntawm leej twg. Nyob rau hauv rooj plaub no, nws yog ib qho tseem ceeb los xam qhov siab ntawm lub khib.
Hloov kho rau 145 MHz
Kav hlau txais xov rau TV ntawm hom no tsuas yog tsim nrog lub dipole reflector. Hauv qhov no, vibrators yog siv nrog nruab nrab conductivity. Cov kws tshaj lij hais tias kev hloov kho nrog wired adapters muaj ntau heev ntawm kev ua lag luam. Lawv cov reflectors yog mounted rau racks. Kev txhawb nqa sab tuaj yeem loj heev. Kuj tseem ceeb yog qhov kev tiv thaiv siab ntawm cov kav hlau txais xov log-periodic.
Yog xav tau, tus qauv tuaj yeem sib sau ua ke hauv tsev. Rau qhov no, cov kws kho mob tshwj xeeb siv hlau racks uas muaj kev sib cuam tshuam nrog kev siv vuam inverter. Lub vibrator yog siv nrog ib qho zis. Cov xaim los ntawm tus kav hlau txais xov yog tsau rau ntawm lub expander. Raws li txoj cai, nws yog mounted rau hauv qab ntawm lub mast.
qauv nrog tooj liab mast
Logo-periodic kav hlau txais xov rau T2 nrog tooj liabmast ua haujlwm zoo ntawm ntau zaus. Tus qauv qauv muaj xws li ib tug hu rau adapter uas snaps rau hauv qhov chaw nyob rau hauv qab ntawm lub stand. Vibrators rau cov qauv tsuas yog siv nrog lub expander. Nws tseem yuav tsum tau muab sau tseg tias muaj cov kav hlau txais xov nrog dav reflectors hauv khw. Feem ntau ntawm lawv tuaj yeem ua haujlwm ntawm qhov tsawg zaus. Cov kws tshaj lij hais tias muaj cov khoom siv rov qab polarization. Rau lawv, expanders yog siv nrog kev sib cuag reflectors. Qee cov qauv tau nruab nrog amplifiers uas txuas rau subs.
Cov khoom siv nrog steel mast
Logo-periodic kav hlau txais xov nrog lub mast steel tuaj yeem ua los ntawm koj tus kheej. Rau qhov no, cov kws tshaj lij pom zoo kom npaj kev txhawb nqa dav. Cov qauv feem ntau yog cov conductive heev thiab zoo haum rau kev txais lub teeb liab. Vibrators rau cov qauv siv nrog sib txawv rhiab heev. Hauv qhov no, amplifiers feem ntau yog ntsia rau hauv qab ntawm masts. Cov kws tshaj lij hais tias lub adapter yuav tsum tau kho tsuas yog los ntawm transistor thiab fais fab mov.
Ntxiv thiab, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias thaum sib sau ua qauv, cov teeb meem yuav tshwm sim nrog cov racks. Yog tias peb xav txog cov kav hlau txais xov hauv khw, ces lawv muaj qhov dav dav. Hauv qhov no, cov kev txhawb nqa pem hauv ntej tau ruaj khov ncaj qha rau lub mast ntawm lub cuab yeej.
