I hadn’t intended to write about Sirius XM so soon after last week’s column, but the satellite radio company’s financial woes were sending me a clear signal — one uninterrupted by tunnels, mountains, sunspots and more than US$3 billion in debt. I mentioned Sirius XM last week in reference to Congress’ vote to delay the digital TV transition to June; another example of government laying its heavy hands on a hyped technological breakthrough that encountered problems upon arrival for consumers.