I would like to operate 160m using a shortened vertical. I have read alot about "Tophats" and I know what they do and why but, have never had an opportunity to put what I learned about them into prac
Bill, The capacity hat should only be placed at the top of the vertical element. Placing the hat any lower on the element essentially chokes off any current flow above the hat making the antenna elec
Bill top loading wires would be ineffective. Top loading wires work best when at the top of the vertical section. Good luck and 73 Bob N6WG _______________________________________________ Topband mai
How does the "hat" on a Cushcraft 402-CD work? You have those crossed aluminum rods after the coil, then extended aluminum after that. What happens if you take off the crossed rods? 73, N2TK, Tony --
If the hat has the purpose of substantially loading a short element in the most efficient possible way, then it has to be at the top of the element. If the hat has instead the purpose of loading an e
those crossed that. What Tony, If they just needed to tweak the tuning very slightly and found that adding a hat was cheaper than retooling a coil form, then the hat is probably OK. If they added th
The "hat" on the Cushcraft 402-CD (and XM-402) provides relatively little capacitance compared to the element tip. Without the "hats," the element tip would need to be extended by 24 to 36" each sid
G'day, If the "tophat" effectively isolates the section of tower or what have you above it, then those folks matching towers with stacked beams are surely loosing quite a bit of effective structure.
If the "tophat" effectively isolates the section of tower or what have you above it, then those folks matching towers with stacked beams are surely loosing quite a bit of effective structure. xxxxxxx
My experience with using towers with large directional antennas as the "top hat" follows the line of thinking that has been expressed in this thread thus far. For example, at W7MCO ( http://www.eaars
"I have several 200-foot towers with lots of HF stacks. I asked that question about a year ago when I was considering using them as verticals. Almost unanimously, the replies were that it would not b
I agree with Earl. Much of the difference in opinion on this subject has to do with what is really a fairly complex situation. It is convenient if a whole category of proposed construction is defined
My 42' tower and SteppIR 3 element beam at 45' are shunt fed at the thrust bearing. A single 120' horizontal loading wire is also attached to the thrust bearing plate. Very clearly, tuning the elemen
The HIGHER the beam is on the tower, the more top loading it (the same size beam) will provide. Chuck W5PR _______________________________________________ Topband mailing list Topband@contesting.com
I haven't modeled, but in two actual cases -- one with 70 foot of Rohn 25, the other with 100 feet -- I had a 204BA on the mast a few inches above the tower. On the 70-footer I added a Wilson 4-el 15
Back 15yrs ago when I first installed my 130' rotating tower I first put up a 4 element 20M beam at 60'. I installed a shunt feed 2' away from the tower and the tap at 58'. This tuned very easily wit
Author: "George Stewart (VK5ALS)" <ggstew@bigpond.net.au>
Date: Thu, 10 Jun 2004 16:21:32 +0930
Hi Topbanders, While we are milking this thread for what it is worth I would like to throw in a closely related question I have been sitting on for a while. Given that in a simple situation where one
"I haven't modeled, but in two actual cases -- one with 70 foot of Rohn 25, the other with 100 feet -- I had a 204BA on the mast a few inches above the tower. On the 70-footer I added a Wilson 4-el 1
Watching frequency shift to determine current distribution is a great deal like the misplaced notion we can grab the jacket of coax and watch SWR shift to tell if we need a balun. Every Yagi would ap
diameter guy-wires declined at together. situation? the total The best thing to do is model it George. This is the type of thing models work well for, as opposed to radial system design (hi hi). Usi