To properly explain the issue I’m facing, I recorded a video showing Oscilloscope waveforms.
The gnuradio flowgraph is here:
The various versions of the software/hardware involved are the following.
- gnuradio-companion: 220.127.116.11 (Python 3.6.9)
- gr-limesdr: branch gr-3.8 (last commit 47511dd58de1695b70e1028366411bada85eb60f)
- sdrangel: 4.12.1
- OS: Linux Mint 19.1
- CPU: Intel© Core™ i7-4900MQ CPU @ 2.80GHz × 4
- RAM: 16GB
- H/w: Thinkpad T440p
I’m trying a simple test to create a sinewave output from a WFM modulator block. If there is no audio input, its WFM modulated signal should be a simple sinewave. If I test this with SDRAngel, I see a clean-ish actual sinewave in time domain on the oscilloscope. But if I try to do the same with gnuradio, it seems to produce a glitchy signal.
Could I have any advice on what I might be doing wrong?
Anish // VU2TVE