Hood River County is studying an upgrade to its emergency communications system.  County Administrator David Meriwether says they are trying to eliminate dead spots in the law enforcement radio system.  Meriwether says the problem is particularly noticeable when officers use their portable radios.  He adds many of the dead spots are in the Upper Valley.  Meriwether says a company has preformed a study of what the County already has with the hopes of improving the coverage over the next couple of years, probably through the use of repeaters.