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| To: | <[email protected]> |
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| Subject: | LF: Re: Re: 500kHz attenuation graphs? |
| From: | "James Moritz" <[email protected]> |
| Date: | Sun, 1 Nov 2009 22:07:53 -0000 |
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Dear Alan, LF Group, G3NYK wrote: Generally at LF the skywave starts to equal or exceed thegroundwave strength at ranges exceeding 700km. It may be a little less thatthat 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 Moritz73 de M0BMU |
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