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
Chuck, I've installed a lot of 160 shunt feeds. I would start by raising the gamma attachment point. Usually 2/3 the height of the tower would be fine. In your case 90' should work well. GL! 73, Larr
I tried Bud, W2RU's suggestion of switching the shunt capacitor, but it made the receive level lower. I moved the gamma tap to 70 feet. I connected the center conductor at the top and the shield at t
Chuck, can you quantify the R +j at the feedpoint with a noise bridge or MFJ analyzer? With that information a matching solution can be determined. 74, Gerald K5GW In a message dated 2/15/2010 7:36:4
Chuck -- I believe your gamma rod is too close to your tower. My current gamma rod is seven feet from the nearest side of my 90-ft top-loaded Rohn 45. That's the result of modeling with EZ-NEC, initi
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 matte
Chuck, Regardless of how long you make the shunt feed on the tower, you need to make both the series and parallel capacitors variable. The tuning of the antenna to the required frequency, is governed