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[TowerTalk] 40-2CD Restoration

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Subject: [TowerTalk] 40-2CD Restoration
From: (
Date: Wed, 24 Nov 1999 19:59:17 EST
I was exactly in your situation 2-3 yrs ago.  Same antenna.  Same history of 

The possible mechanical modifications were listed in some e-mail exchanges on 
one of the reflectors.  Basically there are 6 mechanical problems that you 
will probably want to fix: 

(1) high stress to 1-1/4" sections of the driven element and reflector;
(2) securing the elements to the boom;
(3) corrosion of screws in the loading coils;
(4) driven element insulator;
(5) boom joints not secure;
(6) wind balance.

2.5 yrs ago I made all the modifications except # 3. I figured that we here 
in Colorado didn't need to worry about the corrosion factor since we have 
such dry climate (plus I got lazy).  But, this past Sunday I tracked my 
suddenly skyrocketed SWR (10:1) to a corroded screw in underneath the 
insulation of one of the loading coil.  LESSON: be sure and do that mod too.

The antenna (as modified) has otherwise held up well under high winds and 
very heavy wet snow conditions.  It has worked real well for me and made 40 
mtrs a lot more fun.

Others on the list will probably send you the particulars on the mods.  I 
have them all typed up with a parts list and measurements....but 
unfortunately, they aren't in digital form anymore.  

If you end up needing them just say so and I'll make a copy and either fax or 
mail to you on Monday.  In the meantime, I'll be real near you over the week 
end.  Operating 40 from K0RF (just east of Longmont).

73.....Alan / K0AV  (Colorado Springs)

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