Richards wrote:
> okay, that makes sense to me. But, then why do they use
> a 4:1 balun for open feeder line?
>
Because open-wire feeder is often used in applications where it is
unmatched - for example a doublet. Although the characteristic impedance
of the feeder might be 450 Ohms, in these applications the impedance
presented at the ATU is likely to be something completely different.
Steve G3TXQ
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