I have used some of the online calculators, but engineers have told me that some of the results are questionable. I have used Speedstack from Polar, but I don't believe they offer any free "starter" version. I guess I needed to qualify my query and ask if anyone knows of an ACCURATE free impedemnce calculator. :>)
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.