Ive copied US BCB stations as far inland as Chicago in the far eastern Meditaranean. Id be curious what the propagation mode was and if sky wave how many hops?
I also regularly hear the LF BCB stations from EU and AF in the roughly 150-200KHz region and sometimes sounding like locals. What path is this? I dont believe that the antipodes or other very long haul 160M QSO's have completely been explained yet BUT Ive had better luck with an inverted vee than phased full size 1/4 wave verticals with 32 elevated radials for each.at grayline. OTOH at other times the verticals are FAR superior. Carl KM1H Carl KM1H ----- Original Message ----- From: "Richard Fry" <[email protected]> To: <[email protected]> Sent: Saturday, May 05, 2012 3:51 PM Subject: Re: Topband: Fwd: radals fer 160m vertcal > RE: >>> Those fields from very low elevation angles (say, less then 5 degrees) >>> can reach the ionosphere, and under the right conditions return to the >>> earth as a useful skywave. > > Mike Waters asks: >>My question is, on what amateur bands is this common? And on what >>amateur bands is this possible? > > It is universally common for the highest radiated fields launched by > vertical monopoles to occur in the elevation sector between the horizontal > plane and 5 degrees above the horizontal plane. This is a natural > consequence of the summation of individual fields generated along the > height > of the monopole by the r-f current flow there. > > The graphic linked below is taken from Radio Engineers' Handbook by F. E. > Terman (1st Ed), showing that the skywave from the monopole of a typical > AM > broadcast station that serves the greatest single-hop range leaves the > radiator at elevation angles of 5 degrees and less. > > This will be true for HF monopoles, also, but the range would depend on > the > height of the layer of the ionosphere where the reflection takes place. > > http://i62.photobucket.com/albums/h85/rfry-100/TermanFig55.jpg > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1424 / Virus Database: 2411/4979 - Release Date: 05/05/12 > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
