Hi. I have a 500w linear amplifier at 160m band. The output is 50ohm. My antenna is an inverted L with lenght = [5*(wave lenght)]/16. I read at ARRL handbook that a variable series capacitor 0-1000pf
Author: Mike Waters W0BTU <mrscience65704@yahoo.com>
Date: Fri, 28 May 2010 13:12:04 -0700 (PDT)
The formula you provide above calculates to a total length of your inverted-L of 50 meters (164 feet), if wave length=160. My 150 foot inverted-L (vertical portion is 50 feet) has the following matc
Here is how I did it, along with my reasoning behind the design. I have a tall ash tree and was able to achieve an 85' vertical run with an easy bow-and-arrow shot. I elected to build an inverted L a
thank you all of you for your answers. So more radials, means lower swr? Do you think that the variable capacitor is all i need for low swr? If i will not achieve swr<1.5 what do you think about to t
Typically, putting in radials raises the SWR, but you add them in anyway because they make the antenna more efficient, allowing you to radiate more signal instead of heating the ground with it. You t
Lowering Z with more radials is the classic sign of reducing lossy series resistance in the ground system. This is a straight power loss to RF heated dirt which adds to the radiation resistance of th
More radials will reduce losses. Crudely put, they will reduce dc losses at the base and they will also reduce rf losses by capturing some of the rf that is radiated by the antenna but splashes off t
Fellow Topbanders, The output is 50ohm. My [5*(wave lenght)]/16. I read at series capacitor 0-1000pf is enought to with my antenna. What do you think about this? Do propose anything else? (maybe a va
Hi, and thank you for your interest post. In my case is difficult to install so many radials. You can see a drawing about my transmitter area here: http://tzitzikas.webs.com/transmitter_area.JPG the