If you want to get a better understanding of how the video downlink or radio uplink to your FPV model works - you need such an measurment device. It's nice to read a lot about the theories but I need some proof. Here you can see what's going on.
Links:
http://rfexplorer.com/models/
http://www.aaronia.com/products/spectrum-analyzers/
►Product Reviews: http://goo.gl/mZkwHr
►EQUIPMENT: http://goo.gl/QNzck
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