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On Fri, 17 Oct 2008 17:23:05 -0400, "Bill Ogden"
wrote: I seem to remember reading that running coax underground acts like a current choke. However, my memory has many missing bits these days. Is this a true statement about coax underground? In my case the run is about 40' (in a conduit that is about 10" under ground). I am interested only in the normal HF bands. Hi Bill, The coax shield is no different in loss as is a ground radial wire of the same dimension. Visit any site that offers the data of Brown, Lewis, and Epstein to observe that for their experiments at 3MHz, the amount of radial conductivity drops like a rock well in advance of the end of the wire (where it would be forced to zero by being open). You might get it to conduct a bit further by having insulated it from ground (the conduit), but it is still easily within ground's deadly embrace. 73's Richard Clark, KB7QHC |
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