Towertalkians.... As I am sitting here waiting for a huge programto load into the file server I started asking myself about the simple dipole...or Inverted-Vee (I know there is a difference.) Althoug
You can learn a whole lot about dipoles reading the ARRL Antenna Book. Yes, thicker wire will give better wider coverage, but the 3 to 1 VSWR bandwidth will never cover the whole band. What I would d
Here's an EE's explanation for a Liberal Arts guy. :) First, let's look at the PERCENTAGE bandwdith that we're trying to cover, because that's really what drives the design. 160m -- 10.5% 80m -- 13.3
I set mine for the middle of the areas I want to use. On 80 meters I operate 3500 or so and around 3800. The middle is around 3647 so I set lowest SWR about there. Well, maybe. I doubt you would not
Hi Lee: There is a huge amount written on the simple dipole antenna. I would first consult any ARRL Handbook as well as the Antenna Book. One of my all time favorite web sites is that of Dr. L. B. Ce
Open wire fed dipoles having enough length to cover to 3.5 MHz (minimum 140 feet, center fed), really work well. I make mine 175 ft long (split in the middle for the open wire feed). At this length (
Would it make any sense to cut one of the bow tie wires to a different frequency than the other to get a double tuned circuit type of response? i.e. two SWR minima with a hump in between to increase
Hio Lee Check out this site http://www.cebik.com/trans/wb.html Some good info on broadbanding your dipole. 73 Tom W7WHY _______________________________________________ See: http://www.mscomputer.com
You are right on with that antenna Tim! I have always had at least one of them up here. I could never figure why anyone would want to put 140 feet of wire up in a tree and then just use it on one ban
a different type of I've never really investigated that so I have no idea if it is better or not. The main limitation in bandwidth is the stored energy in the abrupt end boundary where the electric
I tried modeling that with EZNEC and it didn't seem to help much, so I ended up keeping the lengths the same. I also modeled the two wire bow-tie dipole with the open ends and with the ends closed (a
For a fan dipole there is much coupling between the two wires, so making them different lengths doesn't really buy much in bandwidth. If you take one of the wires of your fan dipole and put it at rig
I have maintained two different wire antennas for years. One is a 280 foot (approx.) multiband 450 ohm slotted commercial line fed antenna I have tuned via a massive homebrew tuner. Because the new
K4SAV commented about fan dipoles & transforming the fan into something more like two dipoles not in parallel but with a common feeder: I had always thought take off angle had something to do with he
antenna. It is compared to Wave angle is determined by height, ground characteristics, and polarization of the antenna. Bowtie or not, pattern shape is not significantly different than a regular dip
"Wave angle is determined by height, ground characteristics, and polarization of the antenna...." Tis true, tis true! I just jumped to a conclusion and assumed that when most people build this antenn
being, it is not have made 80 feet, it four or five have. I was speaking about a bowtie. I use a pair of smaller gauge wires fanned out to a spreader made from 1/4 or 3/8th inch aluminum tubing. I c