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Initially I will be building a simple, portable unit for 5.6GHz using the FPV/drone modules.
Thinking about the camera, would a car dash cam be any good?
They are quite cheap and support HDMI connection. They also have the ability to view jpegs from the memory card, so I thought this could hold one or two test cards with station info. Some specify a frame rate of 25 or 30 fps, is this good enough, or are there better ones available?
Or would I be better off using one of the many cameras designed for the drones?
There are plenty of cheap composite output cameras on eBay originating in China. There's a 700 TV lines version with a 2.8m to 12mm zoom lens for under £11 including postage. Search for "CMOS mini CCTV camera with zoom" At that price it won't attract the attention of HMRC.