I just built a cobweb last weekend and will get it up in the air this weekend. I built it for the omni pattern. I have uses a 1:4 balun single wire design for each band. I will give an update and comparison between my other three antennas later this weekend.
73 KD8NNU Don Sent from my HTC on the Now Network from Sprint! ----- Reply message ----- From: "Don Wilhelm" <[email protected]> Date: Fri, May 31, 2013 5:14 pm Subject: [Elecraft] cobweb antenna To: <[email protected]> That is not a reasonable statement at all. It may be that bringing the ends of the dipole close together will allow it to be placed close to those objects without the normal de-tuning effects, but to state that those objects will not absorb radiated power is a real stretch of the imagination. 73, Don W3FPR On 5/31/2013 2:59 PM, Vic K2VCO wrote: > Theoretically, performance should be similar to a dipole, although > with a near-omnidirectional pattern (and of course reduced bandwidth). > It might be perfect for certain antenna-restricted circumstances. > > There is a statement on the G3PTW website which is interesting, and I > would like to hear what others say about this: > > "The confined electric near field (caused by the high impedance ends > of each dipole being close to each other) also ensures that the > antenna does not couple to other electrical conductors i.e. telephone > wires, power cables, television antennas or even the ground and lossy > di-electrics such as trees and buildings. Thus the radiated power is > not absorbed by nearby objects, it is all radiated into free space. > Breakthrough and noise pick up are also reduced to an absolute minimum > and the ground conductivity and height do not affect the antenna tuning." > > Does this sound reasonable? > > On 5/31/2013 10:46 AM, Yngvi (TF3Y) wrote: ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
