if you don't have the manufacturer's specifications that cover your situation then the best thing to do is to have a qualified engineer study the tower and installation site and make proper plans. i
Tia-222 can't calculate things like that because those types of calculations are up to the manufacturer and engineer designing the system. Manufacturers like rohn do sets of generic designs for 'stan
i have taken down a couple that were up with house brackets. they work ok. you do have to be sure that you anchor them to an appropriately reinforced wall, don't just drill into normal attic framing
Pull the needle off the dial and turn it to show where the antenna is really pointed. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet:
Even having a whole email bounce with the headers won't help. The missing link is what address this guy was using when he subscribed to the list. That address was obviously a 3rd party forwarding ser
No they haven't, I got one 1/2/05 for all my list memberships. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net _______
nope, probably very little discussion. The answer is: You won't find anyone who is properly qualified to answer those questions who will dare do it in a forum like this. The corrollary is: If you wa
Depending on the spacing of the 2 existing rods you could reduce your ground impedance by 50% or more with 2 more rods. Maybe a LOT more depending on the exact geometry of the situation. Lots of peop
That is a convenient way to say 'keep them away from the foundation'... moisture helps for low frequency and low current grounding where ion conduction is the main conduction method, but does almost
You can not 'require' moist ground for an adequate ground... in fact you usually have to design for the worst case and be sure you have a good enough ground even when the soil is dead dry. David Robb
Two rods about 3' apart and 1' from a slab are probably not much better than 1 rod near the slab. For best effect the rods should be space at least their length apart. It would definitely help to add
It depends on what you start with and what you change. From what you are starting with you could reduce the impedance by probably more than 50% by adding one 8' rod 8' from the foundation.. your two
Sounds like a good ground system to me. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net ______________________________
No lightning threat from supplying AC power??? How about just parking a fuelcell or generator at the tower. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node
Where I work we have blown chunks out of concrete utility poles we were testing with artificial lightning. And it is common for chimneys that are hit to suffer damage. I have also heard of pieces be
And after all that throw in a few more factors. The near fields, both magnetic and electric, can do lots of damage also. The magnetic field can be enough to induce voltages that can flashover power l
one more very important part of the pier/pad foundation is the tying together of the pier and pad with proper rebar. The pier just doesn't get poured on top, it must have sufficient rebar to be soli
also note that the problem may be engineering rather than materials. or possibly the engineering of the materials. the really old telrex antennas used an old aluminum alloy that was not as stiff as m
from ka9fox: Found you guys talking about geo888@cs.com bouncing on your list. He was doing the same thing on one of mine. I found the culprit. It's george_sau@compuserve.com. I did a search on my li