[TowerTalk] Shunt Fed Tower - 160 Meter Gamma Match Question

[Chuck]

With the higher attachment point, more series capacitance and zero 
capacitance to ground I now have 2.5 to 1 SWR.  It also was able to make 
several contacts: C6, P40 and W8.  I guess it is just a matter of fiddling 
with the feed now.  Thanks all who responded for the help.  See you in CQ160 
SSB.

Chuck W5PR

----- Original Message ----- 
From: "Chuck" <w5pr at swbell.net>
To: <towertalk at contesting.com>
Sent: Monday, February 15, 2010 10:35 AM
Subject: [TowerTalk] Shunt Fed Tower - 160 Meter Gamma Match Question


>I am trying to shunt feed a tower for 160 meters.  I have a 135' Rohn 55 
>tower with several good sized antennas on it.  Guys are insulated.  I have 
>run an old piece of coax up 35' about 2' off the tower for a gamma.  I have 
>about a 150 pf variable in series and 200 pf to ground.  Ground is 2 -140 
>foot radials, elevated 10'  (In the past I think I have used larger 
>capacitors for this.)
>
> I do not get any match on the series variable with 200 pf, 100 pf and 0 pf 
> to ground.
>
> What is the easiest thing to do now?
>
> 1.  Shorten the radials?
> 2.  Increase the series capacitance?
> 3.  Increase the capacitance to ground?
>
> Is my gamma too short?
>
> Thanks!
>
> Chuck W5PR
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk