3 ms·
Well, it is truly amazing what you can do with a cheap RTLsdr dongle and some time and energy. I used GNU Radio to build a receiver flowgraph that decodes and d
by mikewarot 3y ago
Well, it is truly amazing what you can do with a cheap RTLsdr dongle and some time and energy. I used GNU Radio to build a receiver flowgraph that decodes and displays the signal from a nearby VOR aircraft navigation transmitter. It was cool to drive around it, and see the pointer update in real time.
The sensitivity of these things is on the order of a normal receiver, (0.1 microVolts) which surprised me, knowing the samples are 8 bits.
- CamperBob2 3y agoADC sensitivity is influenced by quite a few things, some of them pretty unintuitive (e.g., some interference from unwanted signals in the RF passband can be a good thing if it provides a source of dithering that allows weaker signals to cross bit boundaries). Bit depth is surprisingly far down the list in overall importance. To understand why, look up "FFT processing gain." Consider that sigma-delta converters are 1-bit ADCs, yet the S-D topology is used for many applications that require wide dynamic range.
- brcmthrowaway 3y agoThe interface between analog and digital signals is weird science