Cov txheej txheem:
- Thaum twg tus kav hlau txais xov tig tau tsim?
- kav hlau txais xov turnstile ua dab tsi?
- antenna canted yog dab tsi?
- Dab tsi yog turnstile array?
Video: Leej twg invented turnstile kav hlau txais xov?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Tus kav hlau txais xov turnstile tau tsim los ntawm engineer George Brown ntawm RCA hauv xyoo 1935. Qhov piv txwv no muaj 6 qhov sib tw "bays" ntawm 70 ko taw mast. Txhua "bay" muaj ob qhov hla 3.6 meter dipole uas tau tsav cov ntsiab lus, pub rau hauv quadrature (nrog rau 90 ° theem sib txawv).
Thaum twg tus kav hlau txais xov tig tau tsim?
In 1936 nws tau tsim lub "turnstile" kav hlau txais xov, uas tau los ua tus qauv rau TV thiab zaus-modulated (FM) xov tooj cua tshaj tawm.
kav hlau txais xov turnstile ua dab tsi?
Turnstile kav hlau txais xov muaj cov qauv hluav taws xob omnidirectional nrog kab rov tav polarization. Lawv feem ntau ua haujlwm ntawm VHF thiab UHF zaus ntawm 30 MHz txog 3 GHz. Lawv feem ntau siv rau FM & TV tshaj tawm, kev siv tub rog thiab kev sib txuas lus satellite dav dav
antenna canted yog dab tsi?
Tus kav hlau txais xov turnstile muaj plaub lub kav hlau txais xov monopole ua ke hauv ib lub phasing network thiaj li tsim tau ib lub kav hlau txais xov polarized. Tus qauv kav hlau txais xov yog yuav luag omnidirectional thiab tsis muaj qhov muag tsis pom kev uas tuaj yeem ua rau fading nrog tumbling satellites.
Dab tsi yog turnstile array?
Kev Tsim Kho & Kev Ua Haujlwm ntawm Turnstile Kav hlau txais xov
Ob tus tib ib nrab-yoj dipoles tau muab tso rau ntawm lub kaum sab xis rau ib leeg thiab tau noj inphase. Cov dipoles zoo siab 90 ° tawm ntawm theem nrog ib leeg. Turnstile array kuj tuaj yeem raug hu ua crossed dipoles array …
Pom zoo:
Koj puas tuaj yeem pleev xim tus kav hlau txais xov yagi?
Peb puas tuaj yeem pleev xim lossis camouflage sab hauv lossis sab nraud lub koob yees duab lub koob yees duab? … Luckily, lo lus teb rau lo lus nug no yog, " yog" - tsuav yog cov xim tsis muaj hlau lossis hlau flakes. Peb tuaj yeem mob lub kav hlau txais xov kom haum rau sab nrauv ntawm lub tsev lossis phab ntsa sab hauv .
Vim li cas cov tsheb thauj khoom muaj cov kav hlau txais xov?
Pickups muaj tus kav hlau txais xov, tsis yog tus qauv iav tsim kav hlau txais xov rau ob peb lub laj thawj. Namely yog rau kev tsim, lub zog ntawm lub teeb liab, thiab kho yooj yim! Kev siv lub kav hlau txais xov hauv tsheb yog dab tsi?
Puas yog hom polarization yog muab los ntawm helical kav hlau txais xov?
Helical kav hlau txais xov nyob rau hauv hom axial ntawm hluav taws xob yog ib qho circularly polarized travelling-wave wideband kav hlau txais xov . Yuav ua li cas ntawm polarization yog muab los ntawm helical kav hlau txais xov Mcq?
Leej twg qhov siab ntawm vhf xov tooj cua kav hlau txais xov tseem ceeb?
Qhov siab ntawm VHF xov tooj cua kav hlau txais xov tseem ceeb vim VHF suav tias yog "kab-ntawm-pom" kev sib txuas lus thev naus laus zis Qhov tseem ceeb, koj tuaj yeem sib txuas lus ntawm ob lub kav hlau txais xov uas nyob hauv. pom ib leeg.
Cov kav hlau txais xov twg tsim cov qauv hluav taws xob ntsug?
Kev piav qhia: Cov nyhuv tib yam li dipole kav hlau txais xov tuaj yeem ua tiav nrog ib lub quarter wavelength kav hlau txais xov lossis Marconi kav hlau txais xov. Ib ntsug dipole nrog lub khob noom cookie-zoo li tus qauv hluav taws xob, uas ib nrab ntawm cov qauv nyob hauv qab ntawm lub ntiaj teb.
