BLOOMINGDALE, Ill.--(BUSINESS WIRE)--PCTEL, Inc. (NASDAQ:PCTI), a leader in Performance Critical Telecom solutions, announced its 2015 second quarter results. First Quarter Highlights $27.6 million in revenue for the quarter, an increase of six percent from the same period last year. Gross profit margin of 35 percent in the quarter, compared to 41 percent for the same period last year. GAAP operating margin of negative six percent for the quarter, compared to operating margin of two percent for