Vatican Radio DRM @ 9800 kHz, 15 Jul 2012

There was a thunderstorm that cleared up about 20 minutes before broadcast began. Transmission started out with a marginal 10 dB SNR, good for a few bursts of audio. It is now almost 15 minutes in, and the signal is almost into the interference and flopping around.

Typically, there is diagonal striping pattern, as fading sweeps slowly from one band edge to the other, and usually always in the same direction. My guess is that the rapid zigzag pattern is coming from the interference.

It's now 20:05 UTC:

On the right hand side, interference has totally consumed the signal. The Dream DRM receiver is losing frame sync. Today's transmission is a write-off.