[Lowfer] Why put a coil under the top hat ???

[jrusgrove at comcast.net]

A good read...

http://www.strobbe.eu/on7yd/136ant/

Jay




----- Original Message ----- 
From: "Andy - KU4XR" <ku4xr at yahoo.com>
To: <lowfer at mailman.qth.net>; "600 meter group" <SHMRG at piobaire.mines.uidaho.edu>
Sent: Thursday, December 24, 2009 3:11 PM
Subject: [Lowfer] Why put a coil under the top hat ???


> Greetings all:
> 
> A few things I have learned over time; What works for one; may
> not work for another, Theory is just that, it works on paper,
> but not always in the real world as it did on the paper. 
> ***   AND !!  ***    Don't argue with sucess !!  
> 
> Thus my question.
> 
> For Base applications only, what is the benefit of putting a
> coil directly underneath a top hat ?? 
> What value should the coil be in reference to the Inductance 
> needed for resonance ( a known value ), and still have a 
> tunable coil at the bottom  for changes in the antenna due 
> to weather and such ?? 
> Weight considerations and wind load; how should the coil be
> constructed ?? ie; what form material, wire size, etc.
> Is there an optimum placement in the vertical radiator line ??
> such as 1/3rd up, 1/2 , 3/4ths , or right at the top hat ??
> ****   Where can I read up on this ? good information, 
> multiple websites will have multiple answers and opinions.
> I would like some good solid information on the topic.
> 
> Thank for replies, and Merry Christmas to everyone ::
> 
> 
> 
> Andy - KU4XR - EM75xr - Friendsville, TN.
> LOWfer Beacon " XR " @ 185.29866 KHz ( QRSS-60 )
> Coordinates:  N:  35* 43' 54" - W:  84* 3' 16"
> http://www.myspace.com/beaconxr
> http://webpages.charter.net/ku4xr/
> 
> 
>      
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