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#1
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Dear Group:
I have read several times the quotation that has prompted discussion. (see below) The statement uses "it" too many times for me to know what is being contended. The statement mentions shooting, stability, termination, and at least one wire as a Beverage (wave) antenna. As we all know, Beverage's wave antenna is used on receiving for its directivity and rarely is used as a transmitting antenna. My request is to see a clear statement in Standard English (BCC English is ok) of what W8JI is contending. 73 Mac N8TT -- J. Mc Laughlin - Michigan USA Home: "The only thing that prevents people from shooting themselves in the foot with the wire below the Beverage is the wire couples to the lossy media below it so well it becomes very lossy, and of course that means it doesn't help with stability or termination." |
#2
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My request is to see a clear statement in Standard English (BCC
English is ok) of what W8JI is contending. 73 Mac N8TT Judge by yourself, here is the complete posting, rest of the discussion is on http://lists.contesting.com/archives...-08/index.html Yuri I'd say that given "average" elevation angles for DX, you should treat both arrival elevation angle and tilt from ground loss as being roughly equal factors. None of that matters anyway Chuck when the pattern of the antenna isn't any good. We know a lot more about antenna patterns and how antennas respond over earth than we did back in the earlier part of the 20th century. The fact is we want the horizontal area of the antenna to have as much response as possible. If we put a wire below the antenna that *really* changed things we know by where it is located it could only make things worse. A Beverage responds in the horizontal area only because of the high loss in the media below the antenna. Without a highly conductive media below the antenna, it's a cloverleaf with a null off the ends caused by the vertical ends dominating the response. It's all in the antenna pattern. We can have all the tilted wave we like but if the antenna has a zero response slice looking at it and major lobes 20dB stronger 45 degrees to either and off both ends, we won't be very happy with the results. The only thing that prevents people from shooting themselves in the foot with the wire below the Beverage is the wire couples to the lossy media below it so well it becomes very lossy, and of course that means it doesn't help with stability or termination. If you think it does, lay a very long wire on the ground and measure the input impedance. See how it looks compared to a ~50 ohm ground rod connection....I guarantee it won't look pretty. 73 Tom |
#3
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On Sun, 22 Aug 2004 17:51:47 -0400, "J. McLaughlin"
wrote: I have read several times the quotation that has prompted discussion. (see below) The statement uses "it" too many times for me to know what is being contended. .... My request is to see a clear statement in Standard English (BCC English is ok) of what W8JI is contending. Hi Mac, The danger of this is these "arguments" (offered on the behalf of a otherwise silent party) is that they have every chance of being under reported, and over extended. It quickly devolves to "so-and-so thinks...." to triumphantly prove it-just-ain't-so. It reminds me of past statements offered as V9SRB's logic in his behalf that never were suggested by him nor even intimated. As a one-time shot against a full statement, I suppose that is enough to critique, but I have seen this hothouse orchid bloom into fully fleshed philosophies projected onto the silent protagonist by unrelated statements forced into continuity by the critic presuming a sub-context. If Yuri, you have some beef against Tom, I can fully concur in his personality taking you there. Has he offered howlers? You bet! Is he guilty of other rhetorical shenanigans - don't we know. Is he demonstrably skilled? Well, yes, that too. [warning to readers, metaphors employed to a sly comic interlude] Suffice it to say no Radio Moscow program ever interviewed a Radio Free Europe commentator to serious issues - why would you expect such a re-alignment of the heavens for your sake? Ask George W for help; you might find he would take on the evil Dr. Joyce Brothers to solve our moral problems with Howard Stern. ;-) 73's Richard Clark, KB7QHC |
#5
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On Sun, 22 Aug 2004 22:15:56 -0400, "J. McLaughlin"
wrote: I shall file in my list of interesting-things-to-think-about-in-a-serious-way the issue of what happens to the behavior a wave antenna having a "wire" on the ground directly under the antenna wire. I do recall dealing with a similar issue where I was verifying a modeling issue by testing the Zo of a very long wire over a conducting plane. Hi Mac, Where the discussion remains technical, it seems to me that both Tom and Yuri are saying the same thing. On the other hand, they may say it differently, but the conclusions seem to agree. Your experience and studies to this point would be instructive. 73's Richard Clark, KB7QHC |
#6
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KB7QHC:
Where the discussion remains technical, it seems to me that both Tom and Yuri are saying the same thing. On the other hand, they may say it differently, but the conclusions seem to agree. Huh? Which "same thing?" Yuri |
#7
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#8
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![]() KB7QHC: Where the discussion remains technical, it seems to me that both Tom and Yuri are saying the same thing. On the other hand, they may say it differently, but the conclusions seem to agree. Huh? Which "same thing?" Yuri Which difference? 73's Richard Clark, KB7QHC What are you refering to? Can you be more specific? Wire laying on the ground "changing" resistance or terminating Beverage in the ocean? Yuri |
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