Just a bit of clarification - Grayline antennas do have a counterpoise - they are off center fed dipoles in a vertical position. No radials required, nor even would they be of any assistance. They are NOT end fed antennas! They also require a remote tuner at the feedpoint to work right. He may be getting RFI if his tuner is indoors rather than where it is supposed to be, at the feedpoint - and some kind of balun (choke) to stop the currents on the coax braid.
In case of a direct hit by a Lightning will it damage all my radios, amps, … that are connected with the ground rod. Because the ground rod is connected to the antenna with the coax shield? Thx 73 de oe3sze
Hard to say, but you may have some damage to some equipment. It depends greatly on many factors, mainly how good your ground system is. Commercial cell towers take hits all the time and don't fry all their equipment, but they have extensive, and expensive ground systems.
The ARRL book on Grounding and Bonding has some really great ideas. I implemented the desk ground plane and since then have very little RFI even at legal limit and with multiple computers. Cost a bunch in copper but it's worth it.
Me too! That long feed line to the antenna and its routing seem mighty susceptible to RFI. Same with the ground cable from shack to earth. There's a video on line from a ret'd Navy dude who used to work in the ship's radio room, far above the water. He stated that they'd use coax with the shield connected by a capacitor to the main conductor at each end to give both a DC and RF ground, since the RF was more likely to pick the shield to run to ground. Also, could copper tape, say, a couple of inches wide, do a better job than a cable to earth ground (taking advantage of the "skin effect")?
With the antenna feed from my antennas having ferrite chokes on upstream side of my grounding connector as well as in the shack on each feed line, would putting a 1:1 unun at my antennas; an EFHW, a DX Commander, and a J-Pole be necessary and would it be helpful with regards to RF interference? 73 KN6ZVI
Lightning arrestors... do they dissipate the build-up of charge to try to prevent lightning or only act as a path to ground when high voltage ⚡️ occurs? It just doesn't seem for the size of the devices or the grounding that they could pass the currents involved.
Lightning arrestors are not effective at dissipating static build up. Your radio's front end will be damaged way before any lightning arrestor kicks in. To prevent static build up, wind a coil on a ferrite rod and insert it into your feedline. It will electrically short the outer conductor (braid) with the center conductor to drain any static, but it doesn't act as a short on RF voltages. Search UA-cam on how to build one.
I have the same setup for my diamond cp 6. but not for my dipol for 40/20 meters. Sir, would you recomend my to do same grounding for my dipol? 73 de oe3sze
Just a bit of clarification -
Grayline antennas do have a counterpoise - they are off center fed dipoles in a vertical position. No radials required, nor even would they be of any assistance. They are NOT end fed antennas!
They also require a remote tuner at the feedpoint to work right. He may be getting RFI if his tuner is indoors rather than where it is supposed to be, at the feedpoint - and some kind of balun (choke) to stop the currents on the coax braid.
I also disconnect the coax outside the house with approaching thunderstorms as a direct hit is problematic
I would coil some of the feed line in the shack around a ferrite choke (DX Engineering has them) to arrest the stray RF..
In case of a direct hit by a Lightning will it damage all my radios, amps, … that are connected with the ground rod. Because the ground rod is connected to the antenna with the coax shield? Thx 73 de oe3sze
Hard to say, but you may have some damage to some equipment. It depends greatly on many factors, mainly how good your ground system is. Commercial cell towers take hits all the time and don't fry all their equipment, but they have extensive, and expensive ground systems.
@@jimdawdy6254 Thank you very much for your answer Jim. 73 de OE3SZE
The ARRL book on Grounding and Bonding has some really great ideas. I implemented the desk ground plane and since then have very little RFI even at legal limit and with multiple computers. Cost a bunch in copper but it's worth it.
RFI is Radio Frequency Interference. It's undesirable signals received on the receiver.
The problem is the antenna. Choke it behind the tuner as designed. Do not ground tuner. If running high power you need more ferrite.
Read the instruction hams. You all never read the instructions.
“May” be helped. How many grounding and bonding videos of the same do you need.
I was thinking chokes, but I guess the unun works too.
Me too! That long feed line to the antenna and its routing seem mighty susceptible to RFI. Same with the ground cable from shack to earth. There's a video on line from a ret'd Navy dude who used to work in the ship's radio room, far above the water. He stated that they'd use coax with the shield connected by a capacitor to the main conductor at each end to give both a DC and RF ground, since the RF was more likely to pick the shield to run to ground. Also, could copper tape, say, a couple of inches wide, do a better job than a cable to earth ground (taking advantage of the "skin effect")?
With the antenna feed from my antennas having ferrite chokes on upstream side of my grounding connector as well as in the shack on each feed line, would putting a 1:1 unun at my antennas; an EFHW, a DX Commander, and a J-Pole be necessary and would it be helpful with regards to RF interference? 73 KN6ZVI
Lightning arrestors... do they dissipate the build-up of charge to try to prevent lightning or only act as a path to ground when high voltage ⚡️ occurs?
It just doesn't seem for the size of the devices or the grounding that they could pass the currents involved.
They dissipate high static voltages between the inner conductor to the outer conductor, which should already be grounded.
Lightning arrestors are not effective at dissipating static build up. Your radio's front end will be damaged way before any lightning arrestor kicks in. To prevent static build up, wind a coil on a ferrite rod and insert it into your feedline. It will electrically short the outer conductor (braid) with the center conductor to drain any static, but it doesn't act as a short on RF voltages. Search UA-cam on how to build one.
I have the same setup for my diamond cp 6. but not for my dipol for 40/20 meters. Sir, would you recomend my to do same grounding for my dipol? 73 de oe3sze
An choke on feed line at the antenna could help also. To keep the RF off of the ground side.
It this antenna. Wrong