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In article ,
David wrote: On 8 Sep 2005 08:17:00 -0700, "bpnjensen" wrote: I agree in general, except for the fact that a dipole has a characteristic directionality, whereas a random wire significantly shorter than the wavelength will be omnidirectional. I suspect that there will be occasional times when this factor matters. When it doesn't matter, a random wire is still a more versatile antenna than a single-lambda dipole, even when untuned. I have an Alpha-Delta DXUltra, which is basically a multi-lambda dipole, and a 60-foot random wire through a transformer at 20 feet elevation above ground. Noise levels aside, there is little I can hear on the DXUltra that doesn't appear on the wire, and quite a bit on the wire, especially at freqs 6 MHz, that is inaudible on the DXUltra (even though the DXUltra supposedly is good down to 120 meters - this loss of signal may be a function of inadequate height, since the antenna center is only 27 feet sloping to 7 feet at either end). Bruce Jensen I find a random wire superior overall to just about any ''tailor made'' SWL antenna I've tried. An antenna "tailored" for a frequency will pick up more signal energy on that frequency than an antenna of the same type that is not resonant at that frequency. -- Telamon Ventura, California |
Telamon - I 'theory' you are correct.
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In article . com,
"RHF" wrote: Telamon - " The assertion that RHF made was that resonance on an antenna is not important on receive and only important on transmit. " . Telamon - Did I in-fact say that ? ? ? [ Please re-read my original posting again. ] Snip Your original post contained the reply below that you re-posted without comment, which I can only assume means that you are in agreement with it. Your posts are kind of long and rambling so maybe I'm mistaken. = = = In , = = = "Jack Painter" 223bthp@c... wrote: C.E., I didn't mean to imply that an HF antenna would normally transmit farther than it can receive, only that a random wire can sometimes outperform it on the receive-end. This can happen even when listening on the transmitting antenna's resonant frequency. Under average circumstances, a dipole at proper elevation and orientation will outperform a random wire (tx or rx). - - S N I P - - - Jack -- Telamon Ventura, California |
Telamon,
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For One and All,
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Telamon,
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