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Re: [TowerTalk] Cushcraft AP8 Vertical

To: "Tower and HF antenna construction topics." <>
Subject: Re: [TowerTalk] Cushcraft AP8 Vertical
From: "Ron W8RJL" <>
Date: Sun, 10 Oct 2010 21:57:38 -0400
List-post: <">>
Bill, you may be correct, I guess there needs to be some way to keep water out 
of the back side of the SO-239 and a molded blob of plastic would do that. If 
you get a chance check your feedline with an ohm meter to see if the antenna is 
grounded for static discharge.  73, Ron W8RJL
  ----- Original Message ----- 
  From: AI4WM Bill 
  To: Ron W8RJL 
  Sent: Sunday, October 10, 2010 9:44 PM
  Subject: Re: [TowerTalk] Cushcraft AP8 Vertical

        If I am correct it is just a pass-through to connect the positive side 
of the transmission line to the radiator.  The bottom connects to an aluminum 
bracket to the mounting base which gets grounded and the top is connected to an 
aluminum bracket on the bottom section of the vertical radiator.  I have an 
AP8A and I'm sure that is all it is.  I'm curious so I'll go check mine and see 
what I can find.


        --- On Sun, 10/10/10, Ron W8RJL <> wrote:

          From: Ron W8RJL <>
          Subject: [TowerTalk] Cushcraft AP8 Vertical
          Date: Sunday, October 10, 2010, 9:16 PM

          I just obtained an old AP8 which was broken off at the base. There is 
a round black plastic blob directly above and connected to the center pin of 
the SO-239 feed point connector. I have reviewed the manual for the AP8 and 
that item does not appear in the parts list. My educated guess is that it is an 
RF Choke used to keep the vertical grounded to eliminate static charge. It 
might also be shunt inductance for feed point impedance matching. Can anyone 
confirm my suspicions? I doubt a replacement part is available so I will 
probably have to wind my own. Comments welcome. 73, Ron W8RJL

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