[Antennas] Simple Dipole Question

[j. keith carter]

Hi Kelley; I ran your antenna through eznec and the ARRL program TLW to
see where you stood. First with EZNEC 3 your antenna would indicate a
resonate point of  ~ 14.4 MHz. At 14.2 the complex impedance would be
Z=3D66.43 -j17.23 at the antenna. With your 100 feet of 450 ohm ladder
line the input to the line would be Z=3D119.26 -j348.06 ohms. With your
20 ft of RG8X the input would be 5.97 -j60.91 ohms or converting that to
50 ohm input a whopping SWR of 16.86:1. So yes, what you saw is what
you got. Had you fed it with 50 ohm coax from the start your VSWR would
have been 1.5:1. Keith, VE3JKC.

Kelley Shaddrick wrote:

> Today, with nothing better to do, I stuck up a dipole cut for 20m (14.2=
 MHz)
> using 468/frequency. It's strung between two trees at about 50 feet in =
the
> air. I fed it with ladder line (450 ohm) to the house (about 100 feet) =
to a
> 1:1 balun and some RG-8X (about 20 feet) into the 2nd floor shack. The
> initial swr reading is infinite across the band, no dip anywhere, not e=
ven a
> little. I suppose since I'm using ladder line, or window line, I need t=
o cut
> things different. Any thoughts?
>
> Thanks,
>
> Kelley -- W=D8RK
>