A half wave vertical will perform pretty well with a minimum ground system. I don't suppose that QST would publish an article on They have been doing that for many years: End fed zep..., Off center
Good points Rick, That's why many people have good success with the inverted L. If it is made longer than a quarter wave length the radiation resistance rises and a good ground becomes less importan
Check it again but this time place a capacitor in series with the load resistor of a selected size or a variable to make the swr around 1.3 at the load. Then connect your piece of line with the splic
-- You don't want anything sticking out of the concrete either rebar or a ground rod. Not because it is a lightning path but because it will corrode (rust) and the corrosion will work its way up int
Hi Jim, If I understand your setup right, you have ground rods coming out of the bottom of the concrete. That is not a good idea for reasons stated above. It is standard practice to not have any reb
What did you do to the ground system that made the base impedance go up but yet increased the field strength? 73 Gary K4FMX _______________________________________________ __________________________
Contrary to as stated by the other poster; "transfer impedance" does NOT remain constant with frequency. The transfer impedance of a cable is how a lightning pulse gets onto the center conductor of a
Seeing as how you are installing multiple ground rods on your ground system, I would just put the rod in where it would drive without hitting the rocks. A few feet one way or the other will not make
I know of two manufacturers that do it "upside down". Heights is one and there is another (can't recall the name) that looks almost like it that is also upside down. They are aluminum towers and each
Weld up the splits if they are not too bad and you should be good to go? 73 Gary K4FMX _______________________________________________ _______________________________________________ TowerTalk mailin
There will be a great amount of capacitive coupling to ground provided by those long cables even being insulated. A great deal of lightning energy is connected to earth by capacitance in any ground
Copper strap is cheaper than tubing for a given amount of surface area verses tubing. If I had a choice of where to run that extra copper I would run it in another direction from the tower and some f
I thought that by saying that "a DC (bare wire) connection would be better and help more with the low frequency energy coupling" would be taken to mean that it would be better than just the capaciti
Seeing 1:1 swr at the shack means that the swr at the antenna is also 1:1 (provided you don't have excessive feedline loss). Swr will be the same anywhere on the line. 73 Gary K4FMX ________________
If it is 1.2:1 at the shack it is also 1.2:1 at the antenna. The impedance may be transformed but the swr will not be. 73 Gary K4FMX _______________________________________________ __________________
Nice try Jim. Let's get the facts straight though. You were trying to tell us that the SWR on a transmission line would be different at one end of the line verses the other end because of the transfo
My apologies to Jim Jarvis! Sorry for the rant Jim. I just realized after posting that it was Jim Brown that made all the comments on line loss and swr. 73 Gary K4FMX ________________________________
Sorry Jim, but I am not arguing. I fully agree with what you said and I understand about cable loss. I had unintentionally thought that the other Jim had posted what you had and mixed the two in my l
Hi Jim Jarvis, I need to keep the two Jim's identified in the post. I agree with you about the line loss and what it does to swr readings. I didn't think that was what you were saying originally. I h
Lots of people have misconceptions of what a "single point ground system" is. It is mainly concerned with your equipment and not the tower ground system. As others have said, you need a good ground s