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Re: [TowerTalk] Inverted L Tuning - Solved - LONG

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Inverted L Tuning - Solved - LONG
From: w3kl@w3kl.com
Date: Fri, 5 Dec 2008 13:00:32 -0800 (PST)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Another point of clarification...
 
The assertion made regarding no difference between radials starting at the 
tower and radials starting at the base of the Inv L can be made due to the 
relatviely short distance between the base of the tower and the base of the Inv 
L (relative to the wavelength).
 
However, of course, if the inv L base was significantly far from the base of 
the tower, say 0.1 wavelength (50 feet) then the inv L should have it's own 
radial field.
 
73, Jeff

Jeffrey K. Okamitsu, PhD, MBA
+1-609-638-5402

--- On Fri, 12/5/08, w3kl@w3kl.com <w3kl@w3kl.com> wrote:

From: w3kl@w3kl.com <w3kl@w3kl.com>
Subject: Re: [TowerTalk] Inverted L Tuning - Solved - LONG
To: "Richards" <jruing@ameritech.net>, towertalk@contesting.com
Date: Friday, December 5, 2008, 3:54 PM

Sorry, I didn't make myself clear.  Yes, absolutely the inv L needs to see
an efficient ground.
 
However, my point was it doesn't matter if the radials start at the tower
or at the base of the Inv L.
 
In my case, the Inv L wire is also about six feet from the tower all the way
down to the bottom of the tower.  However, at the base the wire comes in
towards the base into a Hoffman enclosure that houses the series tuning vacuum
cap.  The coax is fed right to the cap and I bring the RF ground (100 x 1/4
wavelength #14 radials originating at the tower base) to the coax connector on
the hoffman box.
 
I believe that if I simply kept the 6 foot seperation all the way to the ground
and simply tapped onto the nearest radial at the base of the wire, the results
would be the same.
 
73, Jeff

Jeffrey K. Okamitsu, PhD, MBA
+1-609-638-5402

--- On Fri, 12/5/08, Richards <jruing@ameritech.net> wrote:

From: Richards <jruing@ameritech.net>
Subject: Re: [TowerTalk] Inverted L Tuning - Solved - LONG
To: w3kl@w3kl.com
Cc: towertalk@contesting.com, "K4SAV" <RadioIR@charter.net>
Date: Friday, December 5, 2008, 3:37 PM

I believe it DOES matter whether you connect the radios to the tower vs. 
the coax feed line on the inverted L.   you have to provide a return 
path for the radio, and antenna circuit, and disconnecting that from the 
inverted L. and attaching it to the tower, instead, is not going to 
complete the circuit for the inverted L. antenna.  You must provide the 
return path for the inverted L. antenna directly.  Disconnecting it will 
remove it from the whole antenna system.

I agree with your notion of de-tuning the tower has a helpful suggestion.


Happy trails and 73.    ----  Richards - K8JHR ----
=============================================




w3kl@w3kl.com wrote:
   since your inv L is close to the tower, whether you run radials from 
the inv L or the tower shouldn't matter too much.
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