DISH Network Corp (NASDAQ: DISH) Chair Charlie Ergen is weighing the merger of the two halves of his telecom empire, Dish and EchoStar Corp (NASDAQ: SATS). The companies have engaged advisors, Reuters cites familiar sources. In 2008, EchoStar Communications, which Ergen founded as a satellite television equipment distributor in 1980, changed its name to Dish Network and spun off its technology arm as a new company named EchoStar. Currently, Ergen is desperate to sell some of Dish's assets, tryin