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The usual conception of a 4:1 balun rests on the source-end impedance: normally 50 ohm. The target load-end impedance under a 4:1 impedance transformation is 200 ohm

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Toroid & balun Links

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Balun un-un
Il diametro di ogni singolo conduttore rosso o nero e' di 2 mm plastica compresa, e di 0.75 mm senza isolante plastico

Balun
For some so-called baluns, no throttling action or effect against common-mode currents will be measurable. This means that sheath waves occur and the coaxial cable outer screen acts as an antenna. Domestic interference fields penetrate unhindered over the alleged balun in the receiver

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Enter the frequency of operation and the balanced and unbalanced Z0.Values for L and C will be calculated

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Balun 4:1 in aria
Varie fasi della costruzione di un balun in aria 1:4 per alimentare una antenna long wire tipo canna da pesca o simili

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