Hello all, * Do I understand correctly, that C1 in the diagram is a simple variable capacitor that ranges from 100 pF to 800 pF? (I found one, and purchased it) * Is it for tuning the antenna for min
Hello Tom: Here is an easy antenna that I built last winter for 160 meters. It is simple to build and works very well. I posted this to the TopBand reflector last December and many operators built th
You need radials... The more the better... denny / k8do denny / k8do -- Tonight's top picks. What will you watch tonight? Preview the hottest shows on Yahoo! TV. _____________________________________
Hello Chet! The radials are laid on the ground. They self bury after a few months. I was amazed how well this simple antenna worked. The efficiency is really helped with the full size 1/4 wavelength
Chet: I, too, used a similar three-wire inverted L as my first antenna on Topband back in 1998. The vertical wire went up into an oak tree about 45 feet and bent over to another tree on the far side
Ø The radials are laid on the ground. They self bury after a few months. (Tim) I?m still curious about how you creatively ran the two 132ft radials on what I believe you initially said was a
The back yard lot is 50 ft deep going from the house to the property edge south to north. The antenna goes up over the pool into the tree. The 2 radials run east and west (1 each way). The lot is 300
Very interesting 160 discussion going here. I also use something similar, but use my tower to pull up about 60 feet of wire...then slope it down to a tree in the front yard over the house. The key is
Yes. My 160 antenna in Chicago was not very different from what Tim describes, and I had a lot of fun with it. It was a toploaded vertical, and the counterpoise was a wrought iron fence. The importan
I could get carried away here, but I'll try to keep it short. The tallest object I have on the lot is the 40' tower with a TH3 on top. The furthest standoff is about 5' from the tower, with a pulley
hi Tom, I have not read the QST article but I'll take a stab at ur questions since no one else has. * Do I understand correctly, that C1 in the diagram is a simple variable capacitor that ranges from
"and while having a LOT is better, it's probably only about 6 dB better. That's a good reason for adding radials, but it's not a reason for staying off of 160 if you can't! :)" Yep, I have about 30 m
Mike: Two questions for you to consider: 1. Have you played around with the wire length to approach a better SWR? 2. Have you considered shunt-feeding your tower? No matter which way you go, put in m
Tom. The 165-175 foot length (longer than a quarter wave) raises the radiation resistance of the antenna to somewhere close to 50 ohms but, at the same time increases the inductive reactance. The cap
N4UM explained to Tom: Presumably this is with elevated radials? I thought once close enough to ground, radial length determined performance of return currents (significantly reduced beyond where the
I don't see where what you've quoted has anything to do with whether the radials are elevated or not. And it is VERY tough to get radials high enough to have the advantage of elevated radials on 160M
That is a blanket statement that doesnt hold much water. Belrose and others have published also and believe that 12' is adequate on 160 in many cases. BC band engineers have proven that an elevated s
Incase any of you are wondering what the ground conductivity is in your area, I have a map from the USGS showing just that for the continental US. It is free to download at my website: http://member
What you have is a conventional radial system that happens to be 12 ft off the ground. My 160 vertical currently has 40 radials that are 70 ft long, and it works fairly well too. A true elevated radi
A tree can be effective as an antenna also. It all depends upon what level of efficiency you are happy with. What you are talking about is called a ground plane and has been around since the 30's. Th