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| To: | "[email protected]" <[email protected]> |
|---|---|
| Subject: | Re: LF: Re: Re: 500kHz attenuation graphs? |
| From: | Rik Strobbe <[email protected]> |
| Date: | Sun, 08 Nov 2009 11:22:42 +0100 |
| In-reply-to: | <4F89D5F0D43E42F9B344F909CACE0ECD@JimPC> |
| References: | <[email protected]> <004501ca5a35$30eff840$0900a8c0@lark> <4F89D5F0D43E42F9B344F909CACE0ECD@JimPC> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Internet Messaging Program (IMP) H3 (4.1.2) |
Dear Alan, Jim, over the 420km G4JNT-OR7T path there is a +/-20dB day/night difference 73, Rik ON7YD - OR7T Quoting James Moritz <[email protected]>: Dear Alan, LF Group, G3NYK wrote:Generally at LF the skywave starts to equal or exceed the groundwave strength at ranges exceeding 700km. It may be a little less that that at 500k....And yet, when I watch the signal level of G4JNT's WSPR beacon at night, I see short duration deep fades of 20 - 30 dB quite often, and sometimes enhancements over the daytime level of several dB also. During the day, the signal level shows very little variation. So even at a distance of about 120km, it would seem the ground wave an sky wave strengths must be comparable, in order to produce the fades. Cheers, Jim Moritz 73 de M0BMU |
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