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Cash,
So much to consider. I am writing a proposal right now for UAS surveying in the Philippines.
There are a ton of data links, etc. available but you need to be sure of the frequency allocation in the area you are bidding on...it varies greatly from country to country. Some links use a part of the spectrum that can be an issue.
200 miles is a hump because all the links in the class you are discussing are line of sight. Depending on terrain, a two hundred mile slant range could be difficult. I am assuming sat links are too expensive? Is 100% connectivity require? That is going to drive cost.
Encryption is extra but not hard.
Some things to look for are compression algorithms that can increase down link speed, etc.
Also look for EMI issues on the aircraft and antenna placement...to me that is going to be your biggest problem, especially given the range requirements.
If you want to chat you have my number.
Best.
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1996 FJ80.
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