Just had an itch to figure out what is the max TRMs we could possibly fit in Mk1A, based on the information we have. I did arrive at a number and this is how I went about it:

View attachment 89981
270mm cut in radome is info gleaned from the DDR video and since it makes way for IRST & other sensors the above seems to be the most logical direction of radome shrinkage when going from Mk1/A to Mk2. The arrow length above is probably what Dr Rao gave out.

Also was looking for approximate dimensions of the Mk1 radome and chanced upon

**this link**:

View attachment 89982
Length of Mk1/A radome= 1972mm

Dia of fuselage interface = 883.5mm

BIG assumption- the above figure is authentic information

So for Mk2,

Length of Mk1/A radome= 1972-270 mm = 1702mm

Dia of fuselage interface = ? (say x)

Solving for similar triangles assuming again that the basic geometry of the two radomes is similar, Mk2 is just a scaled down version of Mk1A

x/883.5=1702/1972

gives x=759.81mm

Now, with no power problems on Mk2 it supports 992 TRMs

So for Mk1A 992*(883.5*883.5)/(759.81*759.81)=1341.26

.. assuming circular arrangement of TRMs in AESAR (ratio of area of two circles pi*r*r is the ratio of their radius to the power of 2)

Lots of assumptions in these very back of the envelope calculations with very basic maths hopefully correctly applied. But if correct we could have done about 1300 TRMs in Tejas Mk1A AESAR. For perspective (info from Google chacha) AN/APG-81 of F-35 has 1,676 GaAs T/R modules, & AN/APG-77 radar on F-22 has a total of 1956 T/R modules (both jets have ample power onboard), and Tejas is supposed to be a 'Light" fighter. I think it punches well above its weight even in Mk1A config!