My inverted-L has the same dimensions as the one you describe. It's
installed on a pole so that the base is about 9 feet above ground.
Four above-ground radials serve as the counterpoise.
I feed with coax but it's matched to the antenna with a simple
transmission line UNUN. The antenna feed impedance is about 22 Ohms
with less than 10 Ohms reactive, so feeding with coax would give you a
little over 2:1 VSWR. You should easily be able to match this with a
tuner in your shack.
The UNUN yields a VSWR of about 1.2:1 at 1820, so most of the time I
don't use a tuner. VSWR is under 1.7:1 from the bottom of the band to
If you don't have a tuner, you might check Jerry Sevick's books. He
gives a design example of a 2.25:1 UNUN in one of his later volumes.
Hope this is helpful. Good luck!
On 6/15/09, firstname.lastname@example.org <email@example.com> wrote:
> Would like to hear of people's experiences, if any, with feeding an inverted
> L directly with coax.
Topband mailing list