Ryszard Tymkiewicz wrote:
> Jim I agree with Don K5AQ.. My tower is slightly higher ..18 meters and the
> yagi is just above it.
> I was using 1/4 wave sloper for almost 15 years and I'v thought its the best
> solution (#280 wkd using that sloper),
> but 3 years ago I tuned the tower and I used gamma match..the difference
> between 1/4 wave sloper and
> matched tower was 1 to 3 S...favouring the tower. Its easy to make and to try
My tower is 58 feet tall and supports an LPDA at 60 feet (plus some 6m
antennas at 70 feet, but they don't influence the top-loading
Regarding your shunt-fed tower:
- What kind of radial system do you have for the tower?
- What wire or tubing size do you use for the gamma "rod""
- What is the rod-to-tower spacing and how high up is the tap point?
- Do you use a single series capacitor or an Omega match (two caps) at
I ask because I am currently using a 1/4-wave sloper and would like to
try the shunt-fed arrangement again. I had used a shunt-fed tower at a
previous QTH with good success, but haven't done it here due to a very
limited area for a radial field on a city lot.
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