Q kumphathi wesekethe kunye nerediyo anikwe

Kuyo nayiphi na radio zisekelwe kumgaqo uyakhetha uphawu ukuzala modulated yi yefrikhwensi carrier ethile, nto leyo ixhomekeke livakale kumphathi wesekethe jinga, leyo yeyona nto iphambili kwisekethe receiver. Vula ukulungisa le kwamaza, kuxhomekeke umgangatho umqondiso ezifunyenweyo ziya kukhethwa.

Selectivity, okanye receiver selectivity ixhomekeke indlela maza kokuphazamisa ukwamkelwa oluzinzileyo ziya okuncitshiswe, ngoxa luncedo - emininzi ilandelwa. Q kumphathi wesekethe - le mali ngokungakhethe cala kwindlela zisephezulu, impumelelo yalo msebenzi.

Le rhoqo resonant kumphathi wesekethe umiselwa ifomula Thompson:

f = 1 / (2π√LC), apho

L - ke inductance;

C - ixabiso capacitance.

Ukuze siqonde indlela oscillations zenzeka kwisekethe, kufuneka baqonde ukuba isebenza njani.

Kwaye capacitive, kunye imithwalo ezenza kuthintela kukuvela umsinga wombane, kodwa ukwenze oko ephambana. Ngaloo ndlela, ukudala iimeko ngokuba ukuvela inkqubo oscillation, malunga efanayo njengoko wenza ujingi xa emkhenkceni ezimbini becinga ukuba kumacala ahlukeneyo yanjalo. Enyanisweni, ukutshintsha ixabiso capacitor okanye coil, umntu ukuphumeza ukuba amaza resonant ye yomtya ungqamane rhoqo othwala yerediyo yokusasaza. Ukuba bakubekela yahlukile, incinci iya kuba umgangatho umqondiso. Ukuziqhelisa, umdlali lumiselwe ngokuguqula capacitance le capacitor.

Umbuzo yonke, indlela ezibukhali uya konyukele kwi igrafu impendulo frequency yomfumani. Kanye ukuze abangaboniyo ukuqonda njani uboniso luncedo njengoko uphazamiseko zicinezelwa ziya kuqiniswa. Kwaye Q kumphathi wesekethe i parameter leyo imisela selectivity reception.

Kuchazwa yi ifomula:

Q = 2πFW / P, apho

F - amaza resonant yaloo mmandla;

W - eneji kwisekethe resonant;

P - amandla ukusasaza.

Q kumphathi wesekethe enxulumene ngokunxuseneyo kunye inductance le capacitor umiselwa ifomula kulandelayo:

Q = R√ (C / L)

Ukususela imilinganiselo inductance kunye capacitance ecacileyo, yaye ngenxa R, kuba ukhumbula ukuba ngaphandle reactance coil kunye icandelo resistive. Ngoko ke, lo wesekethe badla ebonisa isekethe kuquka kulo ezintathu elements: i capacitance C, inductance L kunye nokumelana R.

Q kumphathi wesekethe lixabiso bomzimba ngokomlinganiselo izinga ukubola oscillation kuyo. I elikhulu oko, icotha ukunyenyiswa nkqubo.

Ukuziqhelisa, eyona nto ebalulekileyo echaphazela Q yaloo mmandla na umgangatho Ikhoyili, leyo kuxhomekeke ke permeability kumbindi yayo, inani amathuba, ngesidanga wire wedwa kunye nokumelana wayo, kwaye kananjalo ilahleko ngexesha sicatshulwa imisinga ophezulu rhoqo. Ngoko ke, ukuba ukunyenyisa amaza nolawulo ngokuqhelekileyo kusetyenziswa capacitors variable, ezo iiseti ezimbini ezisicaba zibe nangaphandle sithumelelane iisms ebudeni ujikelezo. Loo inkqubo ekuso phantse kubo bonke oonomathotholo non-digital.

Noko ke, kule ne wasele yedijithali une iimviwo kwiisekethe zawo resonant, nje utshintsho zabo rhoqo resonant eyahlukileyo.