TV antenna Sibutsetelo

Okwamanje, zonke ekhaya has eyodwa noma ngaphezulu namathelevishini. Ngoba inhlangano amasignali ithelevishini yezokusakaza kudingeka-antenna. Kunezinhlobo eziningi amadivayisi kokuthola. Bahlukene ngokwenjongo, uhlobo izimpawu wathola, ukuma, ubukhulu nokunye. Ekhulunywe yethu namuhla, ayokhonza njengamakhosi kokuthola antenna ithelevishini.

Ngamunye wethu ezimpilweni zethu e ngandlela-thile ebhekene nalezi amadivaysi. I-antenna TV isakhiwo sensimbi, ngokuvamile ezenziwe aluminium, ngoba ethola isignali yomsakazo. Kuye uhlobo wathola ithelevishini ububanzi, bahlukene phakathi imitha futhi decimetre kudivayisi. Isabelo sabo isayithi ukufakwa ku egumbini nokusetshenziswa ongaphandle. Ngokwamukela indlela ithelevishini isignali antenna kungenzeka nemphambosi yekwentiwa.

Cabangela izinhlobo ezinkulu abamukelayo:

1. dipole noma isidlidlizi zahlukana. Ziyakwazi ikota-wave, nengxenye-wave futhi igagasi. Lesi sakamuva oluhambisana ubude isidlidlizi wavelength of isignali ukuthi sitholakala; lapho kugamanxa-wave - kwesigamu isignali; futhi, ngokulandelana, at ikota - ikota. Y dipole isici impedance kuyinto ohms 300, ukuze engavumelana ikhebuli TV antenna kanye umamukeli ezimweni amateur ngokuvamile zisebenzisa nengxenye-wave ofanayo iluphu. Ukuze zonke aerials ikhebula ithelevishini ukwehla kuyinto isici impedance 75 ohms. Dipole, eqinisweni, kuyinto igumbi analog lukamakhalekhukhwini.

2.-TV antenna uhlobo "igagasi isiteshi" kungaba: ezimbili ucezu, ezintathu-piece, quintuple, semielementnoy, odinnadtsatielementnoy futhi shestnadtsatielementnoy. Eligoqiwe dipole wedwa alisetshenziswa, liyisici asebenzayo yalolu hlobo antenna. Antenna "igagasi isiteshi" siqukethe isici asebenzayo (isidlidlizi iluphu kakhulu), futhi izakhi yokwenziwa, kugqame futhi abaqondisi igibele ingalo abavamile. Umqondisi - a dipole yokwenziwa, elise phambi isici enophephela. Kugqame - a isidlidlizi esemva asebenzayo. Kulesi hlobo antenna, kukhona omunye kusimo ne ukwengeza izakhi yokwenziwa ukuze isidlidlizi wave incipha impedance uvo we-antenna. Bamukela Ngokwazisa yalolu hlobo zivamile enkolweni radar nokuxhumana umsakazo amadivaysi.

3. log-gqwa-antenna ithelevishini yidivayisi broadband, ukuhlinzeka amasignali reception ibanga lokuvama (amagagasi UHF futhi imitha). Ububanzi zokusebenza ze-lelihambisana kahle le-antenna kanye Element, lapho inzuzo uhlala njalo.

4. Framework ithelevishini antenna eklanyelwe amasignali ezimweni lapho antenna "Yagi" ayikwazi ukukunikeza eyanelisayo isignali izinga. Ingabe double noma kathathu isikwele. Amadivayisi yalolu hlobo ehlanganisa inzuzo okusezingeni eliphezulu nokuba lula design, asidingi ukulungiswa.

5. e-esigabeni nehele kuyinto isimiso ohlangothini ehlanganisa antenna omnidirectional ahlukaniswa emkhathini, basuke ahlelwe ukuze isigaba we amasignali konke alinganayo. Ngokuvamile, laba ababuthelwa kusukela antenna ezifanayo achithayo ngonyaka sebuningini lemigqa ixhunywe unit electronic. Common-mode abamukelayo kukhona TV antenna ne amplifier.

Ekuphetheni, sithi ukuba ukukhethwa antenna kufanele wasondela ngamunye, kuye ngokuthi izimo ezindawo wendawo kusayithi ukufakwa futhi elamukelekile.