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Explanation why SNR goes up and down daily

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@macclad wrote:

I noticed my SNR goes from abut 6.8 to 11.8, with 11.8 dB occurring at night. The solar flux at L-band is essentially nothing, so what causes it to go up and down cylically? Is it the thermal noise going up and down in the on-antenna LNA? Just curious.
Thanks.

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