This happens when the satellite owners send a command to shift modes. The telemetry queues are drained and restarted with a pilot signal to help lock on.
On Sat, Feb 8, 2020 at 8:43 PM JoAnne K9JKM via AMSAT-BB amsat-bb@amsat.org wrote:
Noticed today that huskysat stops sending data and sends only a carrier for about a second then starts back up
Observed the same during the pass at 0113Z. I wasn't capturing any telemetry at that point since I was manually tuning in and it hadn't locked. It sounds like a high pitch tone such as how an AM carrier sounds on a sideband receiver. About 1 second duration and then back to the data stream.
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