moon doppler drift
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Michiel Klaassen
Sep 24, 2024, 2:32:12 PM9/24/24
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As an aside, we heard that a radio ameteur was sending constant signals to the moon. https://www.rtl-sdr.com/receiving-10-ghz-reflected-moon-beacon-rtl-sdr/
Not an EME , but a constant signal on 10GHz for everyone to use, as a reference to test the performance of the receiving equipment.
So, we also tuned in.
Indeed the signal from DL0SHF moonbeacon at 10.368.025 MHz can be captured easily with our 10Mm diameter dish.
The station transmits from the moment the moon is above their 20 degree horizon elevation in Germany.
Attached is our reception result. Nice to see that the signal shows a doppler shift because in the moon morning, we on earth, are rotating towards the moon; so we receive a higher frequency.
For us, when the moon sets, we rotate away from the moon and thus receive a lower beacon frequency.
Not an EME , but a constant signal on 10GHz for everyone to use, as a reference to test the performance of the receiving equipment.
So, we also tuned in.
Indeed the signal from DL0SHF moonbeacon at 10.368.025 MHz can be captured easily with our 10Mm diameter dish.
The station transmits from the moment the moon is above their 20 degree horizon elevation in Germany.
Attached is our reception result. Nice to see that the signal shows a doppler shift because in the moon morning, we on earth, are rotating towards the moon; so we receive a higher frequency.
For us, when the moon sets, we rotate away from the moon and thus receive a lower beacon frequency.
I know that the signal is fm modulated, but still I see in the frequency plot a residual at the end. Are there experts who can explain that?
Michiel
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