BY THE MIDDLE OF this year, Canada's largest satellite operator, Telesat, will be a much bigger company. When Loral Space Communications and the Public Sector Pension Investment Board said in December it would pay about $3.4 billion for Bell Canada Enterprises-owned Telesat, it moved the Ottawa-based company into a larger playing field. Its seven satellites plus four from Loral and the four the companies currently have in the pipeline under construction or awaiting launch, will more than double Telesat's size by the end of 2009, when the last bird on the drawing board right now is built. However, much hinges...