Thanks guys. As a test this morning, I ran a 20' cable from my f16v3 to a mini tree and had flickers. testing with an f-amp right off the controller caused the flickering to stop. I then tested a 50' cable and the results, as expected, was very bad. I added an f-amp to the beginning of the extension cable and no more flickers. So far the f-amp is doing a great job.