The recent observations of the LUSAT indicate that its carrier signal has ceased to transmit.
Last signal : SatNOGS Network - Observation 9696076
73 Gustavo, LW2DTZ
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Oh no, or not so local oscillator in the sky (;
https://network.satnogs.org/observations/9770835/
Looks like it is perhaps waay weaker then before.
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Analyzing the spectrograms of last week from the same station and satellite, it appears to be noise or a matter of individual interpretation. Why don’t better-equipped stations receive the same signal?
There are a couple of stations that have received the faint signal the last 48h on different parts of the world.
The majority of the observations, especially on stations without rotator, are high elevation ones, over 80 degrees. Also in the majority of the observations station is a rotator one with directional antenna.
I’ve scheduled some more observations to get more data, let’s see.
Not sure how LUSAT works internally, but it would be interesting to check when we received it if the satellite was under sunlight or in dark. We have seen satellites, and especially old ones, to transmit only when they are hit by sun rays.
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With the Dwingeloo telescope, the signal is not so weak: 9778771 (horizontal) and 9778772 (vertical). IQ data is at SatNOGS IQ data - it may be interesting to combine the polarizations.
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The observations indicate that the LO is operating at only 1 mW of power, and likely not for the entire orbit. The diagram outlines the general structure of the CW transmitter. Receiving its signal before the “zombie” satellite expires will be a significant challenge for any ground station.
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