Matchmaking requires openness, compatibility, shared goals and maintaining a strong sense of identity. That’s the advice for public broadcasters looking to merge, as well as for doe-eyed sweethearts. CET in Cincinnati and ThinkTV in Dayton made the leap nearly three years ago, and by most accounts their union looks strong. The two stations, just 50 miles apart in separate southwestern Ohio media markets, are now incorporated as Public Media Connect and serve a region of 1.4 million households and more than 3.5 million people. Together they showed an operating deficit last year, as did many stations, but the budget gap has been shrinking and is projected to go positive this year.