There were two groups doing rocket triggered lightning. The florida group uses above ground buildings, the other one I believe is in Colorado and uses an underground bunker. In both cases the rocket
I am glad that in the scientific arena theories are not validated by voting. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1
less, so statistically the change is relatively small. In a typical area of central Florida the median stroke current is about 25kA, where in central Colorado it is about 20kA. In the highest curren
all Obviously you do not work with large power lines. The top shield wires are normally at the highest point and are connected to either the steel structure or to a ground wire that runs down the po
situation, The more common 'rule' is that a tower will protect a circle roughly equal to its height by attracting lightning to itself from the area. Larger or smaller distances are claimed by some a
I have an old article about this from the yccc newsletter for oct 1994. unfortunately this one hasn't been converted and put on our web site yet. I will try to get this scanned and put on my web site
Even better than rotating the whole tower is being able to rotate the antennas separately. In some contests, at least here in the states, it is an advantage to have one antenna pointing at Europe and
You need to do some more reading... the answer to all your questions is: build the base per the manufacturer's drawings, or if it's a non-standard installation, per a good engineer's drawings. David
On submarines we used simple graphite lubricants on stainless parts to prevent galling. A similar compound used to be available as a lock lubricant though I haven't checked for it recently. You shoul
the far, is it, drill a the I hate working on rope guyed tower like that... it seems easier to me to assemble the first 3 sections with guy wires attached and stand them up field day style then set
Yeah, seems a waste to me. The only advantage would be to reduce side force on the rotor by increasing the length of it's side of the lever. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: htt
Put a couple rods at the tower base and connect to the service entrance with heavy wire(2ga or 4ga I think is min size, I use 0000ga here). It wouldn't hurt to put extra rods connected to the same wi
I would inspect the outer jacket for cracks or splits and strip back a bit from the ends to see if you get good clean copper. Then use an ohm meter (or megger if you have one handy) to check the insu
If the wx cooperates you can watch the first antenna party here this summer starting to replace the 15m stack. I'm afraid the camera can only see up to the 90' level on the 120' tower from it's vanta
don't forget that its being patented... that seems to be an important part also. _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
peer review, working models, 3rd party independent testing, none are required to publish claims or get patents.... unfortunately. _______________________________________________ See: http://www.msco
there are new antenna designs all the time. but they are incremental changes and build on well known technology. witness the steppir, improved yagi designs by m2 or f12, and yes, even fractal designs
things a Some quotes from above: "I was able to increase the current profile of the antenna over a quarter-wave by as much as two to 2.5 times," said Vincent hmmmm, 'increase the current profile'...
When I tell mine they show up to help... and eat the burgers and drink the beer. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc
probably not. it would leave all the weight of the cables to be held by the top. it would also increase the wind load on the tower. _______________________________________________ See: http://www.msc