piclist 2008\07\17\112229a >
Thread: Connecting a TV aerial
www.piclist.com/techref/index.htm?key=connecting+aerial
face picon face BY : Sean Breheny email (remove spam text)



I deleted the message so I don't remember who said it but someone
commented that TV antennas have an impedance of 300 ohms because it is
close to the free-space impedance. I don't think this is quite true.
They are 300 ohms because the driven elements are usually some kind of
folded dipoles. I suspect that this is to make them an easy match to
balanced transmission line, which is cheaper than coax and can be less
lossy.

Of course there is a relationship between antenna feedpoint impedance
and free space impedance. However, it is not the case that an antenna
will work "better" if its feedpoint impedance is closer to the free
space characteristic impedance.

Sean


On Thu, Jul 17, 2008 at 11:00 AM, Don Kovalchik - W8DPK <KILLspamw8dpk.....spamKILLspamarrl.net> wrote:
{Quote hidden}

> -
<e726f69f0807170822m32ba7b7exe0228980af2035fd@mail.gmail.com> 7bit

In reply to: <487F5E95.7030004@arrl.net>
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Subject (change) Connecting a TV aerial

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