True antipodal focusing of transmitted RF signals does occur at HF frequencies.
BUT as Bob Brown NM7M pointed out in an earlier post the ionosphere at medium
frequencies is to heterogeneous to support antipodal focusing.
73 & GUD DX,
Thomas F. Giella, KN4LF
Retired Space & Atmospheric Weather Forecaster
Plant City, FL, USA
Grid Square EL87WX
SKYWARN Observer # HIL-249
SWFWMD Observer #574
PODX 070 PSK31 Member #349
Yaesu FT-840 & PSK31 News Group http://groups.yahoo.com/group/yaesu_ft840
10 & 6 Meter Propagation Beacon Network http://www.PropNET.org
Solar Space Weather & Geomagnetic Data Archive http://www.kn4lf.com/kn4lf5.htm
HF/MF Radio Propagation Theory Notes http://www.kn4lf.com/kn4lf8.htm
160-10 Meter Amateur Radio Resources & More http://www.kn4lf.com
Florida Space & Atmospheric Weather Institute http://www.kn4lf.com/fsawi.htm
---
Outgoing mail is certified Virus Free via AVG.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.643 / Virus Database: 411 - Release Date: 3/25/2004
_______________________________________________
Topband mailing list
Topband@contesting.com
http://lists.contesting.com/mailman/listinfo/topband
|