Topband: Antenna

[Gene Smar]

Marty:

     I had an inv L for Topband before I built a self-supporting tower and 
shunt-fed it.  For a while I operated both and did A-B comparisons on the 
air.  The tower was 5-10 dB better than the L on TX and RX according to my 
S-meter and others' reports on my sigs.  I have a single varibale 
bread-slicer cap at the base (I run 100 W max) and can match it anywhere 
from 1800 to 1950 kHz or so with the rig's internal tuner.

     I have admitted before that I may not have built the L properly or had 
an adequate radial field underneath it, although I did manage to lay down 
about a half mile of scrap insulated copper wire as radials.  (The tower's 
radial field consist of seven shallow wires, 5 of 100 foot length and two of 
35 foot length, plus 130 plus feet of deeply-buried lightning radials and 
ground rods.)  So the superiority of the tower might be explained by a poor 
radial field for the L.  But that's my experience with shunt-feeding.  I'd 
say do it and you'll probably be pleased with the results.

73 de
Gene Smar  AD3F


----- Original Message ----- 
From: "k8mv%k8fc.com" <k8mv at k8fc.com>
To: <Topband at contesting.com>
Sent: Wednesday, May 02, 2012 9:21 PM
Subject: Topband: Antenna


> Need some help.  Came home from Florida to find damage to most antenna 
> systems here.  Have been using 50 foot high inverted L's on 160 and 80. 
> Want to see it shunt feeding tower will be better but no software to do 
> that.  I have 52 foot of Rohn 25 with a TH6DXX and A3WS on top.  Already 
> have 80 radials out under the L's.  The L's will go.  Can somebdoy plot 
> this thing?  One thing I can not live with is a very narrow bandwith.  I 
> run the station remotely via the internet in the winter.  Any help would 
> be appreciated.
>
> 73's
>
> Marty, K8MV
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK