It is claimed that the radar emission of the APG-77 is undetectable. If true, that would explain why the F-22 is slow in adopting IRST. Just wondering whether you guy/gals have come across this claim before. My source : Page 181 Military Avionics Systems by Ian Moir and Allan Seabridge
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It picked my interest because I also came across a recent report which may indirectly corroborate this claim. There is an Australian parlimentary enquiry back in 2012 when the Air Marshall in his testimony was explaining how the F-15D got jumped on numerous occasions by F-22's during red flag. In my mind for this to happen, it would mean that the F-22 was emitting but the F-15 wasn't picking up the emission. Relevant transcripts produced below :
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The F-22 is a very stealthy aeroplane, the F-35 is enough warmer that IRST will possibly be more effective than against the F-22. The F-22 is still at the top of the heap, the F-35, and all the other wanna-bees are well below the threshold of the Alien Bird! It is and will likely remain the best, because of the tremendous amount of money and engineering invested, no one else has the technology, and no one else has the money to go one on one with the Raptor.
As good as the F-35 is, and it is very high tech, and holds many advantages electronically, the F-22 is a world away better? and the only bird able to plug that "Roswell Connection" into real life! The reason the Brat is still loyal to the "best of the best!
That's without the truly "classified" stuff being revealed, and there is lots of that, but hey, I hope the competition doesn't believe me, let em find out when they under-estimate the Raptor. It will be a lesson they won't soon forget, and it will likely discourage further stooopidity.