Just curious if anyone has experience using either of these over a number of years whether theyre eaten away one any faster than the other. Also the conductivity issue not sure if it matters all that
good point... maybe make the spacing from the tower closer to 6 or even 8'. I don't know if you can overkill it as long as you take into account the possibility of current saturation in the soil - fo
what do you mean by current saturation? DO you mean that the water in the soil boils (called smoking or steaming rods in some of the literature)? But, in general, soil is fairly linear. As two rods a
I really do not think that 3 ground rods is anywhere near enough for an adequate lightning ground. John KK9A Just curious if anyone has experience using either of these over a number of years - wheth
The Polyphaser book on grounding recommended that ground rods be spaced about twice the length of the rods (e.g., 16 feet spacing for 8 foot rods). Presumably that will help with the charge saturatio
The reason for rod spacing is to minimize inductive coupling between them, which reduces their effectiveness. 73, Jim K9YC _______________________________________________ ____________________________
Author: Kevin Kidd <kkbroadcastengineering@gmail.com>
Date: Sun, 10 Jan 2016 08:46:01 -0600
Which doesn't mean that 2 closely spaced rods are worse than 1 rod but that they just aren't as effective as 2 properly spaced rods. This assuming that the rods are firmly bonded together with a lo-z
Here's an interesting question: if the concrete base is an effective ground connection, do you get more value by placing the rods a rod length away from the base? If the idea of separation is to prev
On 1/9/16 10:37 PM, Jim Brown wrote: On Sat,1/9/2016 8:10 PM, Larry wrote: The Polyphaser book on grounding recommended that ground rods be spaced about twice the length of the rods (e.g., 16 feet sp
According to most of the lightning and grounding literature, you can imagine the soil dissipation area of individual rods as half of a ball the radius of the length of the ground rod starting at the
Yes.. just on a superposition of currents basis, you'd say this, without getting into non-linear effects. The real question would be "how far" If you think about the current flowing from a rod or bl
rod." That assumes the soil content is the same along the depth of the rod. After driving 50 ground rods in sandy soil conditions last spring, there was no substitute for rod depth - at least in our
Author: K6OK via TowerTalk <towertalk@contesting.com>
Date: Sun, 10 Jan 2016 10:17:04 -0800
ground connection, do you get more value by placing the rods a rod length away from the base? << Is concrete is an effective ground connection? I have not seen any data regarding the measured _impeda
Author: Kevin Kidd <kkbroadcastengineering@gmail.com>
Date: Sun, 10 Jan 2016 12:47:42 -0600
Paul, My thoughts on long ground rods is that at some point, the reactance of the rod itself will limit it's useful length. What that length is, is totally beyond my skill set... Kevin C. Kidd, CSRE/
Agree that RF design is the key AND low resistance is good. Of course there are exceptions, but perhaps not common among ham installations. I climbed several mountains in ME, noting the lightning "gr
That assumes the soil content is the same along the depth of the rod. After driving 50 ground rods in sandy soil conditions last spring, there was no substitute for rod depth - at least in our soil c
On 1/10/16 10:17 AM, K6OK via TowerTalk wrote: Kelly ve4xt wrote: Here's an interesting question: if the concrete base is an effective ground connection, do you get more value by placing the rods a r
Author: K6OK via TowerTalk <towertalk@contesting.com>
Date: Sun, 10 Jan 2016 14:11:34 -0800
I don't believe this is the case. High R/Lo Z is possible and so is Low R/Hi Z. The subject and content of Section 10 of TIA-222-G, "Protective Grounding," is purely electrical. Mechanical strength i