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| To: | <[email protected]> |
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| Subject: | LF: Re: Further MF impressions |
| From: | "Alan Melia" <[email protected]> |
| Date: | Sun, 17 Jun 2012 15:54:02 +0100 |
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Stefan, the groundwave does not change, but what you have is varying amounts of skywave and daytime "fading" The wavelength is only a quarter of that at 136kHz so it only tales a quarter of the change in (apparent) reflection height to give the same sort of constrctive and destructive interference. 500kHz does not travel over land so well as the surface "roughness" is bigger wrt a wavelength ( but even rough seas are generally less "rough" than land ) Yes 500k is an interesting frequency and quite different to both 136 and top-band. There are times of the day when the fading can be vicious at relatively short range Also with the shorter wavelength most antenna height limited stations can have up to 16 times more ERP than at 136kHz Enjoy the new "playground" :-)) Alan G3NYK----- Original Message ----- From: "Stefan Schäfer" <[email protected]> To: <[email protected]> Sent: Sunday, June 17, 2012 3:03 PM Subject: LF: Further MF impressions MF,I just thought my receiver isn't working correctly. I thought the xtal does not start to oscillate due to the higher ambient temperatures in the afternoon. But later i found that the band noise on MF is significantly lower than in the evening, at least 20 dB. So now i see that the band noise is about 5 dB above my soundcard noise with the current setup.What do others know about the ground wave range in summer and in the afternoon? When does the band open? Similar to LF?BTW thanks to DF6NM for the grabber. Nice tool to get some experience in these first days...73, Stefan/DK7FC |
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