>From: "Laryn Lohman" <[EMAIL PROTECTED]>
>Reply-To: Repeater-Builder@yahoogroups.com
>To: Repeater-Builder@yahoogroups.com
>Subject: [Repeater-Builder] Re: Antennas that work both in commercial and
>amateur
>Date: Fri, 16 Feb 2007 17:33:49 -0000
>
>--- In Repeater-Builder@yahoogroups.com, "Barry C'" <[EMAIL PROTECTED]> wrote:
>
> > >
> > I presume its some sort of stacked arrangment , in chich case it
>will make
> > that gain at resonance ,
> >
>
>Yes, the ASPB602 is four stacked dipoles, just like the DB224. My
>point again is that resonance is NOT a requirement for an effective
>and efficient antenna. The wider frequency coverage for this antenna
>is likely because the dipoles are fabricated from 3/4 in. OD tubing
>instead of 3/8 in. tubing.
or as in many cases of commercial sticks its almost a dummy load in
reactance ( think about it)
I must admit brandishing model number does no good as I am not familiar ,
its been a long time since I was at broadcast school so I am unlikly to
change methodology now :)
For example, most AM broadcast antennas
>(towers) are not resonant at their operating frequency. In fact, more
>and more AM broadcasters are diplexing, and even occasionally
>triplexing. So stations on 820 kc. and 1290 kc. might use the same
>antenna. Is the antenna resonant? No.
it's also not a "stacked" so bear little relevence to the matter
There is little or no
>automatic penalty for using a non-resonant antenna.
just some efficiency
>
>Ask anyone on this list how well the DB420 works down into the 70cm
>ham gand.
>
> > claims are like water (sic)
>
>Very true. The <claims> I make here (6dbd gain and 144-162 mc. at
>less than 1.5:1 VSWR) are quoted from reputable commercial two-way
>antenna manufacturer's data sheets and catalogs, not some ham-grade
>antenna gain claim.
interesting comparison and I doubt you meant to insult hams as a group
>
>Laryn K8TVZ
>
>
>
>
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