Tom,
It all depends on your perspective.
The extra bandwidth can be an advantage when you operate both CW/digital and
phone, especially to Solid state radios. However if you run a tube type
linear or an antenna tuner, then you can usually compensate for the SWR
curve on the TH-6. I optimized my TH-6 for the low end of the phone band and
can work the full band on 20/15 and a most of the 10m band while maintaining
a respectable SWR.
You are correct on the gain. The TH-7 spec actually shows slightly less gain
and F/B ratio as the TH-6. Perhaps because the TH-7 is close spaced and uses
the same 24 ft boom as the TH-6. I think some benefits might be derived by
adding 55 inches to the center of the boom to accommodate the extra driven
element while maintaining the same reflector and director spacing to the
driven elements. I am considering doing this to my TH-6 when/if I have to
lower it for any reason.
* 73's Jim W5IFP *
w5ifp@gvtc.com
>-----Original Message-----
>From: towertalk-bounces@contesting.com
>[mailto:towertalk-bounces@contesting.com]On Behalf Of N4NW
>Sent: Monday, November 30, 2009 14:15
>To: John Hensley; antennas@mailman.qth.net; towertalk@contesting.com
>Subject: Re: [TowerTalk] Question: Can a TH6 be converted to a TH7 Beam
>?
>
>
>I have a TH6 and recently installed a TH7.
>
>The only difference between the two is the TH7 has an additional
>driven element to increase band-width.
>
>If you are only going to use it for one end of the band or the other
>then not much point of making the mod.
>
>I find that my TH6 covers all the band that I use both CS and phone
>for DX without a problem.
>
>The 7 does not have any more gain or better F/B than the 6 in my
>experience, just more weight.
>
>73's Tom, N4NW
>
>At 06:53 PM 11/29/2009, John Hensley wrote:
>
>>Its looks like I am going to be able to acquire a very used but good
>>condition TH6 antenna. Looking for information I only find TH7 at
>>MFG/HYGAIN. Looks like the TH7 has one more element. Does anyone
>>have any information on updating a TH6 to achieve the TH7 specs? Or
>>do I want to do that?
>>
>>
>>
>>TIA< John
>>
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