Hi Everyone, I am here to learn, so I will ask the question. I have been thinking a LOT about building a full size 1/4 wave vert for 75m...I am going to go with the hygain aluminum mast since I have
I guess you weren't paying attention. I just answered that question 5 days ago. http://lists.contesting.com/archives//html/Towertalk/2008-05/msg00115.html ____________________________________________
Daniel, the balun on the Zero Five is used to reduce the loss incurred by the coax feedline because of the very high SWR of the antenna. It does reduce it some but not nearly enough. A balun is not n
Jerry I have a real problem with some of these explanations. Unfortunately I know just enough about antenna stuff to be dangerous. The purpose of a balun is to transform an unbalanced something to a
Mal, a balun can have more than one purpose, most commonly they are used as you said to transform balanced to unbalanced or visa versa. They are also used to transform impedances. These baluns can be
What you envision, Daniel, should work quite well on 80 with at most a minimal matching network at the base. Most likely you can get by without any tuning network and have less than a 2:1 SWR on the
The Balun is a item the use of which should be avoided if at all possible. john w9zy vvvvvvvvvvvvvvvvvvvvvvvv w9zy N7mal <n7mal@citlink.net> wrote: jerry I have a real problem with some of these expl
Actually, a common mode choke IS good practice on the coax feeding a vertical. It prevents coupling of noise between the power system ground and the antenna. It also prevents the outside of the coax
Here are a few links that might be useful to better help understand how baluns are used and the effect they are hoped to produce. http://www.qsl.net/iz7ath/web/02_brew/11_balun/pag01_eng.htm http://w
Matching networks for my 60 foot vertical wire should work on a 65 foot vertical with some adjustment: http://n3ox.net/projects/sixtyvert/matching_networks_18m.pdf That might give you a starting poi
For what it's worth, for matching antennas that are less than 50 ohms, I favor shortening the vertical a tad to show some capacitive reactance and using a *shunt* inductor to step the feed impedance
..."There's more than one way to skin a cat but I think this one gets used less frequently than is justified, given how darn cheap and easy it is."..... Maybe it's because of one of the disadvantages
Another advantage to the capacitor approach is the current maximum is farther away from the ground/radial system. I think one would see a definate field strength improvement. I used this approach on
I also try to avoid using a balun (1:1 unun...whatever term you wish) as much as possible. They seem to be okay when they match up with the parameters of the system they are placed in and these don't
Yeah, quite possible. I do like motor-drive tuning. But you don't *have* to go out to the 50+jWhatever point to do that... though you do tend to need a pretty huge capacitance if you want to tune an
I think I´ve seen the same. I used to have a base loaded 95 ft vertical. Last year I changed it to 95 ft top loaded, 3 top loading wires spaced evenly. Resonance ended up around 1750 kHz. I tune it w
Many years ago I used a 50ft vertical on 160m quite successfully. Top loading was key to its success. I top-loaded it using 6 equally spaced wires which came away at 45 degrees from the vertical and
Hi Al, The "capacity umbrella" was formed from 6 radial wires, each 30ft long coming away from the top of the mast at 45 degrees to the vertical. From the 30ft point onwards they became insulated guy
John, I made a mistake in thinking it was an IERE paper. In fact it was an article by Jack Belrose (VE2CV) in the September 1982 edition of Ham Radio entitled: "Folded umbrella top-loaded vertical an
Ham Radio Magazine is available on CD. I bought them on e-Pay a while ago. 73, Dick, W1KSZ _______________________________________________ _______________________________________________ TowerTalk ma