[TowerTalk] book Tribander comparison test

Mike noddy1211 at sbcglobal.net
Thu Feb 24 17:52:41 PST 2011


You are dead right it is a "tunable "monobander" and in a classification of
its own really, so nothing to compare with.  Even on 20 meters a three
element Steppir has hardly has anything to compare with as most people
putting up a monobander for that band would choose a 4 t 6 element antenna.
But it does work better than a 3 element tribander on 20 meters because it
tunes the whole band without traps, most short tri-banders are a compromise
on 20 meters anyway.

Mike

-----Original Message-----

 > It would be, if they had motors to vary the distance between the
 > elements

Nonsense!  Some 30+ years ago W2PV showed that a monobander was a
monobander no matter what the element spacing as long as the elements
are properly tuned for their place in the array.  Gain is a product
of boom length as long as there are "enough" elements for the length.

Tapered spacing only effects the bandwidth and feed impedance of the
antenna and with a SteppIR bandwidth has no meaning since the antenna
is constantly retuned for the operating frequency.

SteppIR is a tunable "monobander" with a fixed length boom - other
than the optional fixed length elements for six meters, a SteppIR
has no traps or parasitic elements whose sole purpose is to allow
operation on more than one frequency at a time.

73,

    ... Joe, W4TV


On 2/24/2011 6:57 PM, Dick NY1E wrote:
>   " As far as the SteppIR, it's a monobander for all  practical purposes."
>
> It would be, if they had motors to vary the distance between the
elements... otherwise its a tribander (ok 5 bander) with a good swr!
>
> Dick NY1E
> www.ny1e.com
>
>
>
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