For what it's worth, I have the 3 element SteppIR at 70 feet and the
factory default gives very low SWR on all bands.
The antenna is 3 years old and the only swr change I see is when the
tower is lowered; probably due to coupling with near-by objects /
ground. Have you tried homing the elements or calibrating the antenna?
----- Original Message -----
From: "Larry Comden" <email@example.com>
To: "TowerTalk" <firstname.lastname@example.org>
Sent: Sunday, February 10, 2008 9:19 AM
Subject: [TowerTalk] SteppIR Defaults
> I have a 2 ele SteppIP up 50'. The default element lengths require
> very little adjustment on 17, 15, 12 and 10M. But on 20 and 6M they
> seem to be way off indicated by unacceptable SWR of over 3 to 1.
> Example: the driven element for had to lengthened about 12 inches from
> the default or more than 10% to get acceptable SWR in the recent ARRL
> VHF test. The director was then set 5% shorter than the new DE length.
> On 20 I've always had to use a tuner to get acceptable SWR
> Do not have any gain or F/B values to report.
> Has anyone else seen this? Suggestions welcome.
> Larry K3VX
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