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Here is a screen dump of part of an ISS pass (using a Microwave Modules 2Mtr Transverter) showing the bursts of AX.25 packets.
You can see the doppler shift from high to low frequency as it passes over. I slowed the display update rate to 5 samples per second, so the Waterfall represents about 40 seconds.
The 3 strong signals showing up on the Bandscope at around 20MHz (136MHz) are from Gatwick Airport which is close to my location.