[Top] [All Lists]

[TowerTalk] Floating Elevated Radials

Subject: [TowerTalk] Floating Elevated Radials
From: Dennis OConnor <>
Date: Sun, 31 Dec 2006 06:08:57 -0800 (PST)
List-post: <>
There is considerable research that indicates that grounding the elevated 
radials for RF harms the pattern more than just a little... At -1dB hit, and 
likely more...  If the vertical is only +2.7dBi gain to begin with a -1dB hit 
is significant...  At my station another  dB is roughly $2000 so losing a dB is 
significant to me...Worse than the loss is the distortion of the expected 
pattern... When working weak signal DX 1db is often the difference between 
making the Q and not making it...  For rag chewing with the locals on 75 meters 
1dB is meaningless. and you might as well ground everything.
  If DC grounding the radial system is important to you then do it through a 
husky parallel tuned circuit so that the RF on the radial is maintained above 
ground potential.. And put a common mode choke on the coax at the feed point, 
and if necessary repeat the choke 1/8 wave back from the antenna...
  denny / k8do

Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>