Lab 5: FM TX

If you see lots of the letter 'U' in the console, the transmit chain of the USRP is experiencing underruns: samples cannot be produced quickly enough by the host.
In this example (under Linux/ALSA) it will occur because of the 'two clock' problem, but cannot be fixed by changing 'OK to Block' since the Audio Source is producing samples that are all being consumed without issue, but it happens to be doing this a little too slowly.

If you see lots of the letter 'U' in the console, the transmit chain of the USRP is experiencing underruns: samples cannot be produced quickly enough by the host.