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The Work Bench and Soldering Station
Earth grounding - materials and effectiveness.
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<blockquote data-quote="Terryl" data-source="post: 1072584" data-attributes="member: 369937"><p>Hummmm...Gravel, not good.</p><p></p><p>Are you going to be transmitting on VLF or is this just for reception?</p><p></p><p>If transmitting then the spacing between ground points should be at least a 1/4 wave, and setup in what ever direction you want most of your signal to go.</p><p></p><p>VLF frequency's are quite large in the wavelength department as you know, so a ground system that would work well for most VLF signals would be a ground grid, the bigger the better.</p><p></p><p>If you have any AM radio stations near by, go take a look, they are out in a large field, this is for two reasons, one, in case the tower (or towers, the active antenna it self) comes down, and two, for the ground screen, this screen is usually buried 12 to 16 inches down, on 12x12 inch centers.</p><p></p><p>This ground screen is usually #8 copper, and is quite an attraction to copper theft as it covers several acres, and is quite costly to replace, this is why most AM stations around here cove them up with concrete pads or large rocks.</p><p></p><p>I use to hat going out to the transmit site with a reported loss of power, most were just small adgustments, the others were a coroner's call to remove the junky's body after we got it free from the tower and ground grid, supprizing on how many never read the BIG signs saying to not touch the active tower due to the very high voltage.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1072584, member: 369937"] Hummmm...Gravel, not good. Are you going to be transmitting on VLF or is this just for reception? If transmitting then the spacing between ground points should be at least a 1/4 wave, and setup in what ever direction you want most of your signal to go. VLF frequency's are quite large in the wavelength department as you know, so a ground system that would work well for most VLF signals would be a ground grid, the bigger the better. If you have any AM radio stations near by, go take a look, they are out in a large field, this is for two reasons, one, in case the tower (or towers, the active antenna it self) comes down, and two, for the ground screen, this screen is usually buried 12 to 16 inches down, on 12x12 inch centers. This ground screen is usually #8 copper, and is quite an attraction to copper theft as it covers several acres, and is quite costly to replace, this is why most AM stations around here cove them up with concrete pads or large rocks. I use to hat going out to the transmit site with a reported loss of power, most were just small adgustments, the others were a coroner's call to remove the junky's body after we got it free from the tower and ground grid, supprizing on how many never read the BIG signs saying to not touch the active tower due to the very high voltage. [/QUOTE]
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Earth grounding - materials and effectiveness.
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