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Open Wire fed lengths
K7ITM wrote:
... ...which is balanced by the RF on the center conductor. If it doesn't radiate, there's no net current; the center conductor current is equal in magnitude and opposite in phase to the current on the adjacent inside of the outer conductor. Why would you think that what you quoted above would imply that you could get rid of the choke on your transmission line, if you want to keep the line from having a net current and therefore radiating? It says just the opposite. But of course, you already knew that, didn't you? Sorry, rhetorical question. Actually, it took me awhile to put this together, your picture of "the ground" given in your text ... Basically, we are two blind men, you have the trunk of the elephant in hand, me the foot ... but now that I think about it, I remember what picture the trunk brought to my mind ... A radiating ground I have used before, my first exposure to one instance of it was like this: In college, living in a couple of rooms rented to me by an individual having a home near the campus, I resided on the third floor of an old victorian (and, keep in mind, building codes were rather sparse back then.) The plumbing had been "reworked" and sections of it replaced with pvc. The old steam radiators had, had their piping removed in the basement level. In despiration, I had to resort to a wire ran around the base boards of the rooms and "adjusted" for various freqs/bands. This ground DID, indeed, radiate. Indeed, the "fuzz" on the video signal of the tv sets proved this absolutely--at times. The am band on a radio was also, frequently, troubled by my signals/rfi. All the above, because the owner did not want "wires ran about." The "ground wire" I was proposing would attempt to function as a transmission line, and simply carry the signals to a suitable ground; Whether you made that a legitimate number of buried radials of suitable length, a wire ran above ground and through the bushes, a wire connecting a few ground rods, or a run to the pipe in the basement, etc., would be at the users discretion ... however, the "ground wire" would be made to NOT radiate, or radiate as little as possible ... that is "the ground" (but actually, a "grounding transmission line") I was proposing with the coax. Regards, JS |
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