I've installed a lot of 160 shunt feeds. I would start by raising the gamma
Usually 2/3 the height of the tower would be fine. In your case 90' should
On Mon, Feb 15, 2010 at 10:35 AM, Chuck <firstname.lastname@example.org> wrote:
> 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?
> Chuck W5PR
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