Hello. I’m using a LimeSDR-USB for receiving satellite signals (specifically FengYun/NOAA) after an LNB at a frequency of 1200 MHz, with external power supply. The LimeSDR is connected via a USB hub. The initial SNR is good — around 16–18 — but during the reception session, I observe noise and distortions. For example, with FengYun, there’s a screen recording showing the issue. However, when receiving NOAA-21, I get a perfect signal without distortions, as seen in the screenshot. Yes, they have different sample rates, but what could be the root cause? And is it possible to eliminate these distortions using Lime Suite?
Feng Yun
NOAA21