Set-top box maker EchoStar Corp. enjoyed a second-quarter profit of $47.8 million, or $ .53 a share, as revenue rose to $483 million from $331 million. EchoStar Corp., which sells set-top boxes and provides satellite television services to Dish Network, reported Monday that it swung to a profit in the second quarter on a 46 percent rise in sales due to an increase in the sale of advanced products such as receivers with multiple tuners, HD receivers, and HD DVRs was partially offset by a decrease in unit sales of set-top boxes. Also, components previously sold to DISH Network at cost are now sold at cost plus an agreed-upon margin.