6' spacing for a 14 MHz 2-ele Yagi-Uda is short and I think the forward gain
is 4 dBd. I can run a NEC simulation if you'd like. The TH3 should be about
1 dB better on this band. I don't think there is enough difference to worry
about and I would go with the tribander for reliability and price.
Dave WX7G
On Tue, Sep 22, 2009 at 1:31 PM, <RLVZ@aol.com> wrote:
> Hi Guys,
>
> I had great results with a SteppIR 3-element up 60' when the antenna
> worked as designed. Unfortunately, the Controller was bad upon arrival,
> and
> then an 80mph windstorm blew two fibreglass elements off the antenna which
> then allowed water into a Stepper motor and it went bad!
>
> Perhaps I'm a glutton for punishment but I'm seriously considering a
> 2-element SteppIR at a temporary QTH in the Midwest as the 3-element
> SteppIR
> turning radius may not clear the trees. Question: isn't the short 6' boom
> on
> the 2-element SteppIR too short for good results on 20-meters? I am not
> familiar with using modeling programs and don't have the time to learn so
> I'd
> appreciate your thoughts on this.
>
> A 3-element tribander will work at this temporary site as it has about the
> same turning radius as a 2-element SteppIR... and a Tribander like the
> Hy-Gains TH3 might perform as well or even better better on 20-m. (on the
> portion of the band that it is tuned for) as it has a little longer
> spacing
> between driven element and the reflector. Of course the Tribander would
> be
> alot cheaper too.
>
> What's your thoughts on the efficiency of a 6' boom length for a 2-element
> 20-m. yagi?
>
> Thanks for your thoughts!
>
> 73,
> Dick- K9OM
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