I wouldn't put too much credence in the site that you reference. That guy spouts out a lot of mis-information about lightning protection. Most of the references are ok but some are suspect. I have ha
Tom Rauch wrote: With a common buss bar you have ground loops between pieces of equipment. If a surge, lightning etc. should get through to one piece of equipment it will hopefully exit via the groun
That is correct Alan. They do not care how long the connection is, just that it is connected. 73 Gary K4FMX Alan NV8A (ex. AB2OS) wrote: I can't find the message now, but I'm sure that somebody menti
Jim Jarvis wrote: Guys... A few true-isms: 1) coax braid will not handle lightning currents. It will evaporate before draining a strike. Ground strap is better, out of the box, but after corosion, an
Tom Rauch wrote: In HF power amplifiers, I have found a good general rule of thumb is this: At 30 MHz is the clean braid from RG-8 cable has about the same current carrying capacity as #14 or 16 tinn
If you want to spend additional money to add to what you have, I would spend it on a few more ground rods instead. 73 Gary K4FMX Keith Dutson wrote: AES is the vendor for my Harger bar. The bar was s
Jim W7RY wrote: At Motorola the "R56 Site Standards and Guidelines for Communications Sites" strictly prohibits braid of any kind on a communications site. Mostly because of the noise it generates wh
Hi Keith, 2 ground rods is not even a good start for a ground to be blunt. Running some radials out from your connection point and adding more rods will help lower the impedance of the ground system.
Yes the main reason for keeping them away from the foundation is to keep them in a more moist ground. The ground tends to be much dryer under the eves of the house. Concrete is not a bad lightning co
Well, If you turn that statement around to read the way I meant it.. "You do not have a good ground unless it is moist". 73 Gary K4FMX David Robbins K1TTT wrote: You can not 'require' moist ground fo
An example in one of Polyphasers books shows, with 10 foot spacing of rods, 2 rods gives about 50% of one. 3 rods drops to 40%. 4 rods to 35%. 5 rods to 30%. 6 rods to 27%. 7 rods to 25%. 8 rods to 2
Jim Lux wrote: -- Original Message -- From: "Dudley Chapman" <chief@thechief.com> To: <towertalk@contesting.com> Sent: Monday, January 17, 2005 11:17 AM Subject: [TowerTalk] Different lightning groun
Forgot one other advantage of a driven ground rod verses a buried wire. The sphere of influence is greater with a driven rod. 73 Gary K4FMX _______________________________________________ See: http:/
Cel Tower installer who helped me with my tower installation that I should not connect them, that the rods at the tower base would handle any strike I had and I might make things worse by providing a
Being that you have very dry soil you can probably benefit by placing the ground rods a little closer together and using more of them on each radial. In dry soil the sphere of influence is smaller. I
When I said that the "sphere of influence is greater with a driven rod" I was thinking more of a rod driven in vertical as one side is not close to the surface as it would be if it were horizontal. I
Possibly you are not getting the braid conductors all flat when installing. You must not have any of the strands overlap others. If you do that raises that part of the connector fit and the rest will
Note that the harder the grade the bolt is the quicker it will rust. That is why, if grade 5 is called for it should be galvanized. 73 Gary K4FMX Cqtestk4xs@aol.com wrote: Rohn bolts for 25 are fine
With a beam why do you add the gain in when you are below it? You are in more of a null there than you would be with a dipole. 73 Gary K4FMX K8RI on Tower Talk wrote: -- Original Message -- From: "Ji
Why do you install a ground rod at the generator? Do you also install ground rods at each operating position? You may be better off without a ground connection. Let the ac float. Neither side is at e