Topband: Fwd: Re: Impedance of inv l?

[F Z_Bruce]

-------- Original Message --------
Subject: Re: Topband: Impedance of inv l?
Date: Sun, 18 Nov 2018 10:55:47 -0500
From: F Z_Bruce <k1fz at myfairpoint.net>
To: ww3s at zoominternet.net, Topband <topband at contesting.com>



That sounds about right. As you put a good ground system under it, that value will come down, and the efficiency will come up.

Many add extra antenna wire that pushes the current up the wire, this also raises  the impedance, hopefully to near 50 ohms with the right length.
A capacitor (variable, then fixed) in series at the feed point can cancel the added inductive reactance.
73
Bruce-k1fz
https://www.qsl.net/k1fz/beverage_antenna.html

 
On Sun, 18 Nov 2018 10:41:36 -0500, WW3S wrote:

What should the Z be for a 1/4 wave inv l, with the radials attached to a radial plate? Mine seems to be 60 ohms or so....

Sent from my iPad
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