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Cum pot afla parametrii unei antene ?

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Scula e un telefon cordless, cred ca undeva pe la 400 MHz, vreau sa maresc putin randamentul antenei, e dotat cu un arculet, i-am masurat nr de spire, lungimea, diametrul spirei, distanta intre spire, pot sa-i determin impedanta, sau macar frecventa de rezonanta...? nu cunosc multa teorie, nu stiu nici daca lungimea electrica e data de cea a arcului sau a sirmei desfasurate.

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