[TowerTalk] Cushcraft AP8 Vertical
Ron W8RJL
youngron at verizon.net
Sun Oct 10 18:57:38 PDT 2010
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.
73,
Bill
AI4WM
--- On Sun, 10/10/10, Ron W8RJL <youngron at verizon.net> wrote:
From: Ron W8RJL <youngron at verizon.net>
Subject: [TowerTalk] Cushcraft AP8 Vertical
To: towertalk at contesting.com
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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