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KG6BAJ > ANTENA 24.06.08 05:58l 43 Lines 1408 Bytes #999 (0) @ NWSGRP
BID : 1031_GVCITY
Read: GUEST
Subj: Re: feeding an 80 meter loop question
Path: ON0AR<N9ZZK<I0TVL<CX2SA<KD4KVG<KG4IVD<W4RAL<KD4GCA<KG6BAJ<KG6BAJ
Sent: 080623/0258Z @:KG6BAJ.#nca.ca.usa.noam #:1031 [Grass Valley] InterGate $:
** NEWSGROUP: rec.radio.amateur.antenna
** FROM : Wimpie <wimabctel@tetech.nl>
On 23 jun, 08:28, VK3XL <VK3XL.2a50...@radiobanter.com> wrote:
> Hello all, I am planning to erect an 80 meter full wave loop antenna in
> the back yard. The articals I have read so far all seem to feed the
> antenna at a corner with either 450 ohm open wire line or feed direct
> with 50 ohm coax. Due to the layout of my yard it would be preferable
> that I feed the antenna at the mid point of one side of the antenna
> with 450 ohm open wire line to a tuner (4:1 balun included in the line
> and coax to the tuner). Is there any disadvantage in feeding the loop
> mid way along one leg rather than at a corner?
>
> any assistance greatly appreciated
> Mike
> VK3XL
>
> --
> VK3XL
Hello Mike,
Nothing to worry about. Feeding at a corner or feeding in the middle
of the edge/leg has insignificant influence on radiation pattern (it
will be very good for NVIS operation).
The input impedance remains low (<<450 Ohm). Feeding with coax is
possible. Add a common mode choke to reduce influence of cable on
radiation pattern and local noise pick up. I assume that your loop is
almost square (so occupies large area).
Best regards,
Wim
PA3DJS
www.tetech.nl
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