Observation 3264244: METEOR M-2 (40069)

Regarding Observation 3264244 … Can someone advise how to interpret this waterfall?

There is a weak signal from Meteor M-2 for abt. 40 seconds, but than the receiver does not see the antenna. No noise, no signal traces from local qrm.

That change is very abrupt. I’m not sure that M-2 is heard at all, but for sure it appears that there was some physical change that resulted in a drastic loss of signal to your receiver.

There certainly appears to be some intermittent issue with your station. Here’s an example from a NOAA pass: https://network.satnogs.org/observations/3272424/
Nothing at the start of the observation, then something clicks in part-way in and you see signal.

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