I didn't measure the gain, only observed S-meter when receiving from each
located at same station.
Keith NM5G
-----Original Message-----
From: k2qmf@juno.com [mailto:k2qmf@juno.com]
Sent: Thursday, March 17, 2005 9:00 AM
To: keith@dutson.net
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] steppIR Gain--test method
How can there be no difference between a
3 element SteppIR and a "2" element C3????
Seems to me that the 3 element will win every time over a 2 element
antenna......
73, Ted K2QMF
On Wed, 16 Mar 2005 18:32:32 -0600 "Keith Dutson"
<kjdutson@earthlink.net> writes:
> This thread about SteppIR gain has been enlightening for gain figures
> published by antenna manufacturers. I especially enjoyed reading the
> enlightening posts from Tom Rauch.
>
> I considered buying SteppIR over the past year, but decided to go with
> a stack of 4 tribanders and the SteppIR price tag was just too high.
> Also I
> had the opportunity to compare a Force 12 C-3 against the 3 element
> SteppIR.
> There appears to be little to no gain difference on 20-15-10, but the
> advantage of having WARC bands and to be able to "rotate" in seconds
> is quite appealing.
>
> Keith NM5G
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Gary Schafer
> Sent: Wednesday, March 16, 2005 5:09 PM
> To: richard@karlquist.com
> Cc: W7TMT; towertalk@contesting.com
> Subject: Re: [TowerTalk] steppIR Gain--test method
>
> I was looking at the picture and drawing of the test setup on the web
> site.
> They do not show any type attenuator in the drawing.
>
> Even making a differential measurement, trying to read to 1db on a log
> scale with 10db per division is not realistic. You just can't
> "eyeball"
> it that close. Especially if you can't switch back and forth between
> the two signals. Let alone giving tenth of a db gain specs out of
> those measurements.
>
> Using the vernier db attenuator on the 141, if it has not been
> calibrated the linearity can be off without too much trouble for
> making those kind of accuracy measurements. That adds to the error.
>
> It is also easy for the log scale on those to have errors if they are
> not properly calibrated. Not saying that theirs was not but who knows.
>
> The biggest error on the analyzer would come from trying to eyeball
> the same screen position on the 10 db scale.
>
> I assumed that they used the log scale and not the linear scale, which
> would be easier to eyeball for the same spot. But since no attenuator
> was shown the log scale would have to have been used.
>
> By the way if you look at the picture of the test site closely on the
> right side it looks like a set of large guy wires for a large tower or
> power line?
> Not good for a test range.
>
> My whole point is that giving gain specs to a tenth of a db with a
> super test setup would even be iffy let alone all the obvious errors
> at first glance here.
>
> 73
> Gary K4FMX
> [snip]
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
> _______________________________________________
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>
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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