To start, I will give you a major "Well done!" for providing all of the information necessary to figure out your problem!
Now, let's go through the problems: First problem is that your flowgraph sample rate is incorrect. The file says "1024", but you've set your sample rate to 2 MSam/s. Second problem: There are two signals in your WAV file, but neither is centered. You need to first center the signal you want to demodulate, filter it, then demodulate it. I've given you a link for a .GRC file that should successfully demodulate the lower frequency signal. https://www.dropbox.com/scl/fi/cqjh0pi6vlaa1302r6uky/heerekopFlowgraph.grc?rlkey=fysnm7di49fkf05ygoprhksgs&dl=0 I'll work on how to make your flowgraph with the WBFM block work. Will update later. Gary Robert Heerekop said: As a rookie roller coasting in steep learning curve... I recorded several WAV-formats radio FM spectrum with SDRsharp and RTL but fail to WBFM play them in GNR. I try to learn and already did read wikis and watched helpful videos, but failed... Can anyone guide this rookie and get me on track again with a WBFM Wav-file hello world? My failing attempts summarized:
