SvenSvensonov
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OK I made a mistake..
I heard Japan jet engine and radar is modified from US based engine and radar..
So it should be considered as US tech knowledge...
Seems I am wrong..
And I very much respect your willingness to admit said mistake. All too many people here on PDF would continue arguing to the death, despite contrary evidence. So I have to extend my thanks to you for this. Also, the premise of your original post wasn't too wrong. Japan does build both military engines and radars, it's just that the ones they have in service at the moment aren't useful enough for the ATD-X system. But I have confidence that Japanese engineers know this and are developing better performing radars and engines for the production 5th gen fighter, whether it's the ATD-X or not.
Japan likes to build its own systems, even if they are based off of foreign blueprints. They, like Israel, acquire a system and then heavily modify it to suit their own needs. Looking at the F-2, an f-16, we can see this as it has been enlarged. Because Japan likes to build its own systems, it has acquired the expertise and machinery to build indigenous systems too.
This is similar in practice to China's acquiring of Russian weapons, which they then produce and modify themselves, ultimately leading to China's ability to make the J-15 and its derivatives on its own.
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