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![]() RHF wrote: On Jan 5, 9:56 am, Billy Burpelson wrote: Billy Burpelson wrote: RHF wrote: FWIW - Burying the Coax Cable is simply one of the many Synergistic Elements that goes into making a Low Noise Shortwave Radio Listening (SWL) Antenna -a-la- John Doty Three Rec.Radio.Shortwave Messages to Read -by- John Doty http://groups.google.com/group/rec.r...bc6a2bf8acc12d Well, "John Doty" in the reference above says: Any *unshielded* [my emphasis added] conductor in your antenna/ground system is capable of picking up noise: the antenna, the "lead-in" wire... First of all, isn't the "lead-in wire" (coaxial cable in this discussion) -shielded- ? So according to his -own- statement, coax shouldn't have to be buried, at least from a noise mitigation viewpoint. Doty continues: You can keep noise currents away from the antenna by giving them a path to ground near the house, giving antenna currents a path to ground away from the house, and burying the the coaxial cable from the house to the antenna. In the 1930s, Bell Laboratories, while investigating power line influence on telephone cables, proved that burial had NO effect on noise being induced into the telephone cables; i.e., 20 feet of aerial separation, from a noise standpoint, was exactly the same as 18 feet of aerial separation plus being buried 2 feet deep. Hmmm...should I believe "John Doty" or Bell Labs? You're a smart guy -- I'll let you figure that one out for yourself. :-) dxAce wrote: Or, you might believe the 1990's rather than the 1930's :-) - Well, I don't know about the "1990's" (isn't this the 2000s?), - but it became a big issue in the 30s due to the rapidly - expanding electrification of America. John Doty wrote his 'stuff' in the 1990s. Exactly... therefore my comment about the debutantes, the malcontents and the faux's of SWBC. |
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