(Araucaria) Fwd: ARLA/CLUSTER: 150 países feitos c/ uma antena dentro de casa.

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---------- Forwarded message ----------
From: João Gonçalves Costa <joao.a.costa em ctt.pt>
Date: 2010/1/5
Subject: ARLA/CLUSTER: 150 países feitos c/ uma antena dentro de casa.
To: Resumo Noticioso Electrónico ARLA <cluster em radio-amador.net>


 Indoor antenna for 7
Mhz<http://www.iw5edi.com/ham-radio/37/indoor-antenna-for-7-mhz>


I’m looking to setup a hidden / indoor antenna, and i’ve found a couple of
interesting articles on hidden / stealth
antennas<http://www.dxzone.com/catalog/Antennas/Stealth/>


This small antenna can allow hams which lack space to install an antenna for
40 meters. This project has been originally produced by F6CYV. I’m going to
test this antenna in the coming weeks. I will try to setup this inside my
balcony.

According to his experience, using it form inside the apartament, european
singals are all very readable, he has worked over 150 countries.

The antenna is made of 2mm wire.

The 2 coils are constituted by 18 turns of 2 mm wire, distance of tunrs is
also 2 mm.

The diametre of the coils is of 7,8 centimeters.

The Feed of the dipole is done with a 75 ohms tv coaxial cable.

A 1/1 balun would be recommand for a correct feed of the coaxial cable to
the dipole.

It is not necessary  to use a coupler, it is enough to set the length of
both extremities of the dipole in order to have at 7.050 mhz a low SWR, and
especially to pay attention what the lenght of the 2 sides of the dipole to
be identical.

Fonte: Sitio na Internet de Simone, IW5EDI (
http://www.iw5edi.com/ham-radio/37/indoor-antenna-for-7-mhz )



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