Might I suggest you consider installing a Hazer:
That way you can keep the TH-7 and lower it for any maintenance.
73s de Jim
> -----Original Message-----
> From: firstname.lastname@example.org
> [mailto:email@example.com]On Behalf Of James Cain
> Sent: Sunday, April 10, 2011 7:56 AM
> To: firstname.lastname@example.org
> Subject: [TowerTalk] TH7 conversion
> I'm new to this reflector; never thought I'd have the
> opportunity to put up a tower again. I'm hoping to get some
> help here, and thanks in advance.
> I want to turn a TH7 into a TH3 MK4. I compared drawings and
> parts lists and I need to buy two 10 Meter traps and the TH3
> beta match. Then I can build a TH3 per the Hy-Gain plans. No
> problem there.
> My concern is that by using TH7 element parts I may end up with
> a "TH3" that is not to spec in terms of element size and taper.
> And there may be other issues I haven't thought of.
> I can no longer do heavy antenna work on the tower, so I am
> stuck having someone else put the beam up for me. It has to be
> "set and forget." It would be a real hassle to try to strap the
> homebrew TH3 on the tower at, say, 20 feet, and fiddle with it.
> To put the antenna up and find that it's resonant out of one or
> more bands would be a disaster, to say the least. I have
> experience with trapped tribanders ("Suckermasters") and I know
> how unforgiving they can be; screw up 10 Meters and you screw
> up 15 and 20 as well, etc.
> I would love to hear from anybody who has experience in this
> area. Thanks,
> Jim Cain, K1TN
> 7 miles east of Mountain, Wisconsin
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