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1. TopBand: Ducting (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 3 Jul 1997 09:36:12 +0000; I decided to post this after several e-mails about ducting. I'm not convinced ionospheric ducting is anything beyond pure speculation. Even the experts admit there is no way to measure the effect, th; /archives//html/Topband/1997-07/msg00008.html (11,283 bytes)
2. TopBand: Ducting (score: 1): Author: ni6t@best.com (Garry & Yelena); Date: Thu, 03 Jul 1997 20:35:29 -0700; Sounds like the arguments for or against Creation and the Big Bang. observed, but not measurable occasions of unusual propagation, which may or may not have been due to paths not involving repeated e; /archives//html/Topband/1997-07/msg00015.html (10,490 bytes)
3. TopBand: Ducting (score: 1): Author: eldridge@whistler.net (Bob Eldridge); Date: Thu, 3 Jul 1997 21:42:27 -0700 (PDT); You will agree there is lots of conjecture in science (called 'hypothesis' I guess.) Who measured the multiple hops? Time measurements for round-the-world signals have shown that some signals do not; /archives//html/Topband/1997-07/msg00016.html (8,410 bytes)
4. TopBand: Ducting (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 7 Jul 1997 00:00:18 +0000; Hi Bob, Along the same lines, who measured ducting? when I asked if there was any way to measure ducting, the answer was no. So I guess no one measured either, except with OTHR you can see ground ref; /archives//html/Topband/1997-07/msg00023.html (10,315 bytes)
5. TopBand: Ducting (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 7 Jul 1997 00:00:17 +0000; That has been my experience also, working with an OTHR system on the east coast. Enter the ionosphere at a low incident angle far below the MUF, and absorption is much greater than the same path with; /archives//html/Topband/1997-07/msg00027.html (9,928 bytes)
6. TopBand: Ducting (score: 1): Author: bobnm7m@baker.cnw.com (Robert Brown); Date: Sun, 6 Jul 1997 22:11:08 -0700 (PDT); Tom, SKYCOM (Version 1.0) and its Version 2.0, known as PropLab Pro, include ray-tracing programs. Those programs are in two-dimensions (SKYCOM) and three-dimensions (PropLab); they make use of the I; /archives//html/Topband/1997-07/msg00028.html (9,124 bytes)
7. TopBand: Ducting (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 8 Jul 1997 20:48:06 +0000; To: <topband@contesting.com> Hi Bob, I think you and I both agree ducting is speculative, and can not be measured. Since it can not be measured, we can't know many exact dimensional quantities. At t; /archives//html/Topband/1997-07/msg00033.html (13,961 bytes)

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