hi Guys,
interesting discussion If want, hear this file, https://drive.google.com/file/d/0B8I6Nck0GwTdYTI0MzVkY2QtYjUyYS00YmE3LTk4NTktNWVlNzE2ZGFiYmE1/edit?usp=sharing this is E74AW and OZ1LXJ recording of ZL3IX, at same time, John was so kind and sinchronise those two audio recordings together in one file, will hear how QSB is different on different station, when peak is on my side, deep gos to John and VV thanks, 73 cul dado E74AW Дана 06.02.2014 06:21, James Wolf је написао: > Jose, > > I am only presenting the possibility that if the ionosphere (where 160 > propagation happens) isn't uniformly smooth and instead consists of "warps, > wrinkles and tilts" that in a *dynamic ionosphere*, this could be at least > one reason we are experiencing slow fades. > > Elliptical polarization, assuming that it is ever changing, could provide > yet another degree of selective fading. > > I'm don't think I *totally* understand why KL7AJ says that "at HF the > ionosphere forbids the propagation of linearly polarized signals". If at > the magnetic equator, and signals were East to West to equal the earth > magnetic tilt of the signals, it seems that at an instance in time that a > linear polarized signal could happen. But that may be nit picking. > > Jim - KR9U > > From: JC N4IS [mailto:n...@comcast.net] > Sent: Wednesday, February 05, 2014 10:45 PM > To: jbw...@comcast.net; 'Tom W8JI'; he...@vitelcom.net; > topband@contesting.com > Subject: RE: Topband: circular polarization on 160m > > James > > You brought a good article about HF propagation, however the behavor on 160m > is different from HF. If you check on the KL7A arcticle figure 1 what is > happening between 1 and 2 MHz you can see that the green and red does not > behaivor the same way as above 2 MHz. > > This subject is more complex because there us no shirt answer, actualy > between 1 and 2 MHz. the ionosphere does not support linear polariration > wave. The wave are actualy eliptical and not circular for most directions. > > You can check the long answer on the "must read book" from NM7M . R Brown > 'The Big Gun's Guied to Low Band Propagation" . Magneto-iomic Theory pag 47 > to 56 ; and Power coupling pag 57. > > Thanks to Karl. K9LA, the book is available on his also must read site on > the 160m link > > http://k9la.us/html/160m.html [1] > > Regards > > JC > > N4IS > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband [2] Links: ------ [1] http://k9la.us/html/160m.html [2] http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband