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| Subject: | RE: LF: Daytime 29.499 kHz |
| From: | "hvanesce" <[email protected]> |
| Date: | Sun, 9 Mar 2014 05:16:31 -0700 |
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Clemens, Not necessarily; two possibilities come immediately to mind: trapped surface wave and a change in the modal interference pattern (from phase changes due to ice and/or frozen soil, a change in ionospheric height, or a quantitative change in polarization processes). My thoughts on this topic come mainly from the literature, so I could be missing important pieces. On the other hand I found nothing in Watt's book, AGARD, Wait, Thomson or others on the side of substantially lower VLF losses in winter, just higher. I will keep an eye open for other examples of stronger signals in winter, and it will be a pleasure to learn the mechanisms of each of them. I'll begin by trying LWPC (with appreciation to Paul) on the path that you described; and I will pass along any findings of interest. Thank you for the example. 73, Jim AA5BW -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Clemens Paul Sent: Sunday, March 9, 2014 4:15 AM To: [email protected] Subject: RE: LF: Daytime 29.499 kHz Jim, I use to receive SAQ from Grimeton on 17,2kHz here in southern Germany in winter always significantly stronger (I really mean signal strength, not SNR) than in summer. Distance is a bit less than 1Mm, path is virtually completely over land. Is this a contradiction to the material you've presented in your posting? 73 Clemens DL4RAJ >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of hvanesce >Sent: Sunday, March 09, 2014 9:37 AM >To: [email protected] >Subject: RE: LF: Daytime 29.499 kHz |
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