S-band obsservations with different waterfall results

Satellites & Observations Observations
1

If I take this observation SatNOGS Network - Observation 12555392 from a nearby station it shows a single line in the center of the waterfall. However, my observations show a different waterfall SatNOGS Network - Observation 12555368 and SatNOGS Network - Observation 12555369

Any idea what is causing this ? Both running HackRF, I am running 4 MSPS and the other station is running 8 MSPS

2

Maybe yours have some kind of modulation on the supply or something switching ?

3

Let me check what powers my preamp. Thanks

Preamp is usb powered from the same Fujitsu as where one hackrf is connected to. The other hackrf is connected to the Pi runing station 1433. Could be some ground loop.

Think think think.