Re: Advice on Loop

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From: Pastor-KC1DI (elbc@pivot.net)
Date: Wed Dec 06 2000 - 05:39:54 CST


----- Original Message -----
From: "pschweitzer" <pschweitzer@netzero.net>
To: "Low Power Amateur Radio Discussion" <qrp-l@Lehigh.EDU>
Sent: Tuesday, December 05, 2000 11:05 PM
Subject: Re: Advice on Loop

> well Sir
>
> as far as what I find effective
>
> 1st,,, I strictly run monoband dipoles with a 1:1 balun. no tuners ect.
> you may be able to stack dipoles on 1 feed line but insure that you tune
the
> array with a antenna analyzer.
>
> STAY AWAY FROM 450 Ohm line,,,, unless you want to run matched line ( a
> pain) or deal with tvi (another pain(SNIP)

Rob, 450 ohm Balanced line when properly used and balanced causes no more
TVI than Coax.. And for an All Band Antenna it is the feed line of Choice
for it's loss chacteristics.--Dave kc1di

> rob
> KA0PGQ
>
> ----- Original Message -----
> From: Steve Muncy <listsubs@sintezo.com>
> To: Low Power Amateur Radio Discussion <qrp-l@Lehigh.EDU>
> Sent: Tuesday, December 05, 2000 6:34 PM
> Subject: Advice on Loop
>
>
> > I'm not an expert on antennas - far from it - but I've always preferred
> > simple wire antennas. I realized just recently that the placement of
trees
> > around my lot will allow me to put up a loop antenna, although not
higher
> > than 25-35 feet and with a total loop length of around 330 feet. I don't
> > know much about loops, but I suspect such an antenna will be superior to
> my
> > G5RV at 20 feet.
> >
> > The antenna will be used on 80 thru 10 meters. I need the advice of the
> > esteemed and experienced operators on QRP-L.
> >
> > 1) should I go for maximum length of about 330 ft, or cut it back to the
> 272
> > feet that would be a resonant loop on 80 meters?
> >
> > 2) my inclination is to feed it with 450 ohm window line, but I see some
> > recommendations to feed it with small coax. Since I'm usually running
less
> > than 3 watts, line loss of RG-58 might be a consideration since the run
> will
> > be about 50 feet. Any thoughts?
> >
> > 3) or should I just dump the idea of a loop and go with 100' of wire
> antenna
> > fed as a dipole with 450 ohm ladder line?
> >
> > Suggestions direct to me, or to the list are appreciated.
> >
> >
> > __________________________________________________________
> > Steve Muncy, NI5V <mailto:smuncy@sintezo.com>
> > Dallas, TX <http://www.sintezo.com/smuncy/hamradio/>
> > QRP-ARCI #10330 QRP-L #2191 FISTS # 7412
> >
> >
>
>
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