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Scalable is a relative term, the bigger you make it the more power it consumes and the more heat it generates. This has to be handled by different levels of subsystems that aren't scalable. The reason no one is buying the 1500 T/R version is because it doesn't exist except on paper.Elta2052 is scalable radar family. It can be even used for su30mkis. Reason why we are 300 tr radar in jaguars is restriction of sale on israeI to indIa for more powerful variant.
Uttam radars is also a family of radar but is under test phase. It will take at least 5-7 years for maturity and by then GaN modules will be incorporated. That radar will go into Amca and MWF... Mk1A will get elta2052 which is as good as rbe2 radar but with lower range with 500to700 TR module depending upon clearence from uncle...
UTTAM first generation is having gallium arsenide modules but it doesn't matter as 2052 is also GaAs. Instead of waiting on GaN they should put Uttam into full production GaAs modules and outfit all Mk1As. The SAR mapping is just a software issue and can be updated later. At 700 T/R modules it is far superior to the Israelis.