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Re: [TowerTalk] TH-7DXX vs. TH-6DX

To: "'Tower and HF antenna construction topics.'" <towertalk@contesting.com>
Subject: Re: [TowerTalk] TH-7DXX vs. TH-6DX
From: "Bob AD5VJ" <ad5vj@ad5vj.com>
Reply-to: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Date: Tue, 30 Mar 2010 23:12:21 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
My bad earlier I said 36 foot boom I meant 24 foot boom

Bob AD5VJ

> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Joe Subich, W4TV
> Sent: Tuesday, March 30, 2010 3:50 PM
> To: 'Tower and HF antenna construction topics.'
> Subject: Re: [TowerTalk] TH-7DXX vs. TH-6DX
> 
> 
> 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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