Antipodal Focusing, how many SW hops is considered in the 'error margin' voids the definition being met?
1 hop seems to me well within tolerances, but hop lengths do vary with frequency (unless you are using a 'ground grazing' HRSxxx antenna type). An SW hop is 200 ... 300 kms (400 ... 600 kms arc-length-path)... ----- Original Message ----- From: "Charles Hutton" <[EMAIL PROTECTED]> To: "'a HCDX E-List'" <[EMAIL PROTECTED]> Sent: Sunday, September 07, 2003 17:22 Subject: RE: [HCDX] Re: Antipodal Focusing > Since an antipodal path length is 12,500 miles and the error between the > true antipode and the antipode proposed earlier by Mr. Giella is over 3,000 > miles, I know I would not consider his example to be anywhere near > antipodal. > > I don't know of any previous claims that antipodal effect extend that far. I > wish it did, as southeastern Africa would be most welcome here. > > > Chuck > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Thomas Giella > KN4LF > Sent: Saturday, September 06, 2003 4:09 AM > To: a Topica ABDX E-List; a HCDX E-List > Subject: Re: [HCDX] Re: Antipodal Focusing > > > Glenn And All, > Yes you are being a stickler. Yes I didn't pick the best path example for > antipodal focusing BUT in my mind as a teacher I was trying to pass along an > idea in a simple form, in layman's terms that popped into my head at the > moment. Yes I'm still suffering from a summer flu and am not on my toes. Yes > I think you are flaming me because our political ideologies differ. > > 73, > Thomas F. Giella, KN4LF > Plant City, FL, USA > EL87WX > > KN4LF Daily Solar Space Weather & Geomagnetic Data Archive & > Daily HF/MF Radio Propagation Outlook: > http://www.kn4lf.com/kn4lf5.htm > > > ----- Original Message ----- > From: "Glenn Hau-ser" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Friday, September 05, 2003 10:43 PM > Subject: [HCDX] Re: Antipodal Focusing > > > I don`t think I`m being too much of a stickler to point out that the > > antipodes of Plant City out in the Indian Ocean west of Australia, at about > > 28 S, 98 E, is more than 3000 miles, 5 megameters, from Udorn, Thailand. > > This is ``NEAR``?? > > > > Grayline enhancement is a far more likely explanation, and this happens over > > paths much shorter than antipodal. > > > > I can`t speak to 160m contact experience, but I`ll bet the signals from W & > > C Australia are coming from close to the true azimuth, and not from random > > or any/multiple azimuths as would be the case with true antipodal focusing. > > Have you checked this with your 160m beam? > > > > I`m with Walt about antipodal focusing being from a tight area. During his > > period of activity from Hawaii, Richard E. Wood also made much of antipodal > > reception from Zambia. > > > > As for programs about propagation prediction, I think experience and > > understanding the basic principles are more useful. > > > > 73, Glenn Hauser ---[Start Commercial]--------------------- World Radio TV Handbook 2003 is out! Order it now! http://www.amazon.com/exec/obidos/ASIN/0823059677/hardcoredxcom ---[End Commercial]----------------------- ________________________________________ Hard-Core-DX mailing list [EMAIL PROTECTED] http://dallas.hard-core-dx.com/mailman/listinfo/hard-core-dx http://www.hard-core-dx.com/ _______________________________________________ THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed and/or modified under the conditions set down in the Design Science License published by Michael Stutz at http://dsl.org/copyleft/dsl.txt
