On 05/23/2011 04:10 PM, pehaire wrote:
> What about an end fed Zepp? Fed with open wire. I have read that it thinks
> there is an immaginary 1/4 wave section where the feeder is terminate at a
> dead or insulator point. I know this is a high impedance point on a zepp.
> A half wave vertical would need no radials on that resonant frequency.
You may not strictly need radials, but the point of
maximum current is still only 1/4 wavelength above
ground.
This means that:
1) the ground loss due to not having radials is not as
ridiculously high as that of a 1/4 wave vertical
without radials, but
2) chances are that you will still notice an improvement
in signal by adding radials
Personally, I put up a double L antenna for 160m last
december, and plan to add radials over the summer, now
that the weather is nicer.
Without any radials at all, the double L is about 6 dB
below the performance of a 1/4 wave vertical over
perfect ground.
Adding some radials is likely to give me a dB or two.
Adding a near-perfect ground is not an option, or I
would have built a quarter wave vertical to begin with :)
--
All rights reversed.
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