The driven elements in the TH-7 are not in phase. There is
a phase reversal (cross-over) in the middle of the tubes
(feedline) that connects the driven elements. The dual
driven element system on the TH-7 is much the same as the
dual driven configuration of the KT-34/KT34-A/KT-46/etc.
Given test data by respected investigators, I would trust
that the TH-7 is behaving as expected of a 4/4/5 element
trapped antenna on a 24 foot boom and that the TH-6 behaves
as expected of 3/3/4 element trapped antenna on a 24 foot
boom (with the appropriate adjustments for a shorter
effective boom length on 15 and 10 meters in both cases).
73,
... Joe, W4TV
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Bob AD5VJ
> Sent: Tuesday, March 30, 2010 2:58 PM
> To: 'Tower and HF antenna construction topics.'
> Subject: Re: [TowerTalk] TH-7DXX vs. TH-6DX
>
>
> I think they are including the second driven element but
> those elements are run in phase so I am not sure if they
> actually act as two elements or one.
>
> Bob AD5VJ
>
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com [mailto:towertalk-
> > bounces@contesting.com] On Behalf Of Michael Ryan
> > Sent: Tuesday, March 30, 2010 1:45 PM
> > To: 'David Thompson'; 'Tower and HF antenna construction topics.'
> > Subject: Re: [TowerTalk] TH-7DXX vs. TH-6DX
> >
> > The TH7 manual indicates that the "7" has FIVE elements on
> 10 mtrs. -
> > Mike
> >
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com
> > [mailto:towertalk-bounces@contesting.com] On Behalf Of
> David Thompson
> > Sent: Tuesday, March 30, 2010 2:01 PM
> > To: Tower and HF antenna construction topics.
> > Subject: Re: [TowerTalk] TH-7DXX vs. TH-6DX
> >
> > What type of Hornet? I had a Swan-Hornet TB-4H (TB-1000-4)
> and on the
> > bands
> >
> > it was the equal of the Th6. The TH7 does give you better
> bandwidth
> > and the
> >
> > log sell (2 driven elements) gives you a slight gain
> boost.. I would
> > go with the TH7.
> > 73 Dave K4JRB
> >
> > ----- Original Message -----
> > From: "Bob AD5VJ" <ad5vj@ad5vj.com>
> > To: <towertalk@contesting.com>
> > Sent: Tuesday, March 30, 2010 11:58 AM
> > Subject: [TowerTalk] TH-7DXX vs. TH-6DX
> >
> >
> > > Has anyone compared these two antennas Hygain TH-7DXX vs.
> TH-6DX in
> > real
> > > life? I don't see much difference in the manuals except one is
> > supposed to
> > > be more broadbanded and is much more complex for feed and heavier.
> > >
> > > They both have four active elements on 10 and 3 active elements on
> > 15&20.
> > >
> > > I have an option of putting up one or the other to
> replace my Hornet
> > > tribander. According to manuals looks like either one has
> about the
> > same
> > > gain and front to back comparing the two of them so
> putting up the 6
> > > element would put less stress on the tower.
> > >
> > > But either one would increase forward gain 5 db and abt 7 db more
> > front to
> > > back compared to the Hornet.
> > >
> > > 73,
> > > Bob AD5VJ
> > >
> > > 73,
> > > Bob AD5VJ
> > >
> > >
> > >
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