[TowerTalk] TH7 conversion

[Jim Hargrave]

Jim,

Might I suggest you consider installing a Hazer:

http://www.glenmartin.com/catalog/page10.html

That way you can keep the TH-7 and lower it for any maintenance.


    73s de Jim
       W5IFP
 

  > -----Original Message-----
  > From: towertalk-bounces at contesting.com
  > [mailto:towertalk-bounces at contesting.com]On Behalf Of James Cain
  > Sent: Sunday, April 10, 2011 7:56 AM
  > To: towertalk at contesting.com
  > 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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