[Antennas] Loop vs Dipole

Fri, 3 Oct 2003 15:05:24 +0200

If it's a deltaloop and you want to work DX and have vertical
polarization, feed the loop 1/4 wave down from apex and use
a 75 ohm coax as a quarter wave transformer, don't forget that
most coax cables have a 66 percent velocity factor. This kind
of loop works well on the band it's designed for, I have had one
up for 80 meters and had very good results, however I have been
told that the ground below a deltaloop does affect, mine worked
very good here where I live on a hill with sand. Others with good
ground below the antenna report ''not working well''. Regarding
the feeding, please read ON4UN's book ''Low band DX'ing'',
it's available from ARRL bookshop.
Good luck and 73/DX de Osten SM5DQC [email protected]
----- Ursprungligt meddelande -----=20
Fr=E5n: "Bill Aycock" <[email protected]>
Till: "Gene Mason" <[email protected]>; <[email protected]>
Skickat: den 3 oktober 2003 14:47
=C4mne: Re: [Antennas] Loop vs Dipole
>=20
> Gene-
> what band are you working, and what are the dimensions of your loop?
> I have a problem with the downhill phenomenon- I live on a point =
(toward=20
> the South), and, depending on the wind, I cover either the Virgin =
Islands=20
> or Yucatan.
> Thanks- Bill
>=20
> At 12:14 PM 10/3/2003 +0000, you wrote:
>=20
> >Geo
> > I feed my loop at the apex, at the high current point. When I was =
in=20
> > grad school, that was the point that radiated, I sugest it still is. =
Also=20
> > some suggest the feed at the top results in vertical polarization, =
at the=20
> > bottom center, horizontal polarization. Is it possible that =
insufficient=20
> > height above ground is working against you? I hope you are using a =
balun=20
> > with proper ratio. and not using open wire feeders.
> > My configuration works well on all bands, It worked so well for me =
that=20
> > I have 3 loops phased. My performance this week, included a 15 =
minute=20
> > chat with Taiwan, a QSO with a station in Viet Nam, several S-9+ =
reports=20
> > from Japanese stations on SSB, reports from Europe and Eurasia that =
I was=20
> > the loudest station on the band. And all this from my 100 w old =
Kenwood.
> > On second thought, I am on a ridge looking north, that slopes =
about a=20
> > thousand feet downhill to the North. My array is fixxed at magnetic=20
> > North. my modeling software suggests that the electrons roll =
downhill and=20
> > pick up inertia. Also, there is the pine needle and oak leaf =
factors, as=20
> > I am in the immediate vicinity of several.
> >Regards,
> >KZ5V aka Gene Mason
>=20
> Bill Aycock - W4BSG
> Woodville, Alabama=20
>=20
>=20
> - - -=20
>=20
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