Really bizarre issue here. Here is an image of a signal taken from SDR Sharp:
Freq: 926.365M Bandwidth: 30k
Now, using the above measurements, here is this same signal observed in GNU Radio with the QT Waterfall Sink at 5M sample rate:
Here is the same signal at 2M sample rate:
Here is the same signal at 10K sample rate:
And at 1K:
This cannot be possible?!
My GNU Radio flow is as simple as possible, but here's what it looks like:
Can anyone explain this? Surely as I close in on the signal, it should be filling up the Waterfall much more.