Sounds like "empty channel" FM noise to me, and looks like it as a spectrum plot..
What were the settings at the time. Desired RF frequency (144.5MHz?) Mode (AM/FM etc) and demod bandwidths.
What SDR front end hardware are you using with it, and with what
software (drivers and so on etc versions.)
You say it sounds like that for 1 or 2 minutes. What happens after that time? What were you expecting?
Sadly, we need more detail to work with.
A screen save image would be good to see.
73.
Dave G8KBV
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