I have always wondered this.... I know you should recalibrate the display when buying a new dvd player or switching from say component to dvi. How do I calibrate my HDV OTA tuner? Are there test disks that the TV broadcasters give out or do I just have to accept what they give me? I have a Sanyo Z2 projector and a LG 4200 tuner. A response would be greatly appreciated. Thanks.