The TH-7 is a very under appreciated antenna. Read some of the reviews
on eham.net Particularly one from W3JK. Are they state-of-the-art? Of
course not.
But they still work great multiple decades after their release.
I've seen them for sale, used, for as little as $150.
73,
Larry K4AB
On Thu, Sep 12, 2019 at 4:26 PM K9MA <k9ma@sdellington.us> wrote:
> Yes, all three bands.
>
> My point is that, forward gain aside, the TH7 had a very "nice" looking
> pattern. That was obvious just from using it, too.
>
> 73,
>
> Scott K9MA
>
>
>
> On 9/12/2019 16:01, David Gilbert wrote:
> >
> > On all bands?
> >
> > And yes, better F/B doesn't necessarily mean better forward gain.
> >
> > 73,
> > Dave AB7E
> >
> >
> > On 9/12/2019 1:44 PM, K9MA wrote:
> >> I actually measured the pattern of my TH7 and its replacement, a JK
> >> Mid-Tri, under exactly the same conditions. The TH7 pattern actually
> >> looked a bit better, with better f/b. I can't compare forward gain,
> >> of course.
> >>
> >> 73,
> >> Scott K9MA
> >
> >>
> >> On 9/12/2019 15:41, David Gilbert wrote:
> >>>
> >>> You know that power loss doesn't equate to lost pattern gain, right?
> >>>
> >>> Trapped tribanders have shorter elements, which has an effect on
> >>> pattern, and they have non-optimal element spacing for any
> >>> particular band, which again affects pattern gain.
> >>>
> >>> I'm not saying that trapped tribanders don't have utility, but
> >>> compared to a modern non-trapped design they suffer from more than
> >>> just the heat they generate.
> >>>
> >>> Dave AB7E
> >>>
> >>>
> >>> On 9/12/2019 12:55 PM, Glenn Pritchard wrote:
> >>>> Trapped yagis don't suck up gain, another myth easily dis-proven. I
> >>>> have
> >>>> used trapped yagis and mono banders over the course of 30+ years
> >>>> and at one
> >>>> time had the big Wilson 40M3 I believe it was called, 3 full sized
> >>>> 40 meter
> >>>> elements on a 40' boom..
> >>>> It is shown that maybe a trapped yagi has at worst a 0.6 dB loss
> >>>> over a
> >>>> full sized yagi of the same band. It's no surprise that I like trapped
> >>>> yagis because of space restrictions right now and having the
> >>>> ability to add
> >>>> 40 meters to one is skookum.
> >>>>
> >>>> I would like to have mono banders only for 40 and 20 again, perhaps
> >>>> one day.
> >>>>
> >>>> Glenn, VA7UO
> >>>>
> >>>
> >>> _______________________________________________
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> TowerTalk mailing list
> >>> TowerTalk@contesting.com
> >>> http://lists.contesting.com/mailman/listinfo/towertalk
> >>
> >>
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> --
> Scott K9MA
>
> k9ma@sdellington.us
>
> _______________________________________________
>
>
>
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