[TowerTalk] TH6 into a TH7?

[Tom Haavisto]

Hi Bill

Hi Bill

I understand the difference between aTH6 and a TH7 - the later has an
extra driven element so you can get a flatter SWR across the band.
IMHO, it seems like a waste of money.

I picked up an older TH6, and cleaned it up.  For a variety of reasons
I decided to upgrade to a 204, so  I sold the TH6 to a friend - he
disassembled the traps, cleaned it up, and made sure it was in close
to new condition.  We reset the antenna to low phone and installed it
on a 50 foot tower.  Anyway - SWR is 1.2 at the band edges, and flat
in the middle on all three bands.

My point being - I am not sure what value adding an extra driven
element will add to the antenna.  All rigs are quite happy to work
into a slight SWR, cable losses at HF are not a major concern unless
you have really long runs.  A stock TH6 is a good performing antenna
with a good SWR curve, and I don't see the value in adding an extra
driven element.

Tom - VE3CX




On Wed, Nov 12, 2008 at 8:34 AM, Bill <bill_fries at mail.ncats.net> wrote:
> I have a not assembled TH6 antenna.  I also have a copy of the TH6 that was
> disassembled after years in use.  I've been looking at assembling the new
> TH6 when I read the assembly manual for the TH7.
>
> My question:  Would it be possible to use my current parts and make a TH7?
> For example, would the traps be the same?
>
> I asked Hy-Gain and they thought this was going to cost $500.  I'm
> skeptical.  Or wondering.
>
> Bill, AB8SC
>
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