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Re: LF: BIG/SMALL ANTENNAS

To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: BIG/SMALL ANTENNAS
From: "M.J.Powell" <mike@pickmere.demon.co.uk>
Date: Mon, 1 Jan 2001 15:25:32 +0000
In-reply-to: <000e01c073ea$e1eb2740$3a47883e@default>
References: <000e01c073ea$e1eb2740$3a47883e@default>
Reply-to: rsgb_lf_group@blacksheep.org
Sender: <majordom@post.thorcom.com>
In message <000e01c073ea$e1eb2740$3a47883e@default>, MAL HAMILTON
<MAL@g3kev.freeserve.co.uk> writes
Your are all forgetting an important factor. The larger the antenna for the
frequency of interest the greater the Radiation Resistance and  consequently
less losses in other compontents. A small antenna's Radiation Resistance is
surpassed by other losses in loading coils etc ie Rr 0.4 ohms, other losses
possibly 50 plus ohms, heating up the ground beneath the antenna. A case
where theory cannot be implemented in practice.
The big antenna is propogating the signal, the small antenna is burning the
grass underneath it and acting like a leaky dummy load.
What if there is say, 100w, into each Rr?

Mike
--
M.J.Powell


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