Lol, we have plenty of folks who can design systems, unfortunately said designs need to be then calibrated and debugged for which the aforementioned infrastructure is required, and that's putting it in very simple terms.
Even where basic test rigs are available, compare their quality to what the other's are working with, and mind you this is not an argument which can be objected to by stating that much like other's have better technology they also have better test rigs thereby insinuating that we somehow cannot build said infrastructure. We very much can, but we scrimp on it, cut corners (lack of higher order leadership in organisations, which do not take cognizance of the fact that the essentials are just not in place, an engineer can only do so much, imagine having achieved 90% of the dry thrust on the Kaveri in the absence of in-country aforementioned crucial infra, I call that a miracle) and then completely reject what the logical outcome (delays, time overruns, teething issues etc.) points towards (IKARA:- Insufficient knowledge and random action, born out of an absolute lack of any experience on part of the powers that be in said matters).
Here let me give you an example:-
That btw is a pretty big F-18 hanging in there. The picture depicts the Advanced System Integration Lab, NAWC.
Another pic from the ASIL.
The NAVAIR IBST.
AND NOW FOR THE PIECE DE RESISTANCE
The NAL CEM-Lab.
Spot the difference, mind you, if you can build a smaller and stringier anechoic chamber then you can build far bigger ones too with specific and differing testing parameters. Its all about pouring in the money.
BTW, since TATA and Mahindra AND Kalyani are all going to build artillery pieces, do any of them have their own firing ranges? The answer is no, why, because that's what our laws (yup, laws) stipulate. So they had best line up for using one of the army's firing ranges, and best of luck with that.
EDIT:- GOT THE MESA PIC WRONG, HAD MISLABELED IT IN MY ARCHIVES, ITS ANOTHER PIC OF THE ASIL ONLY.
@Abingdonboy @Gessler