Presumably you 'could' build the equipment, but any civilised country would probably require it to submitted for testing and approval (almost certainly at many times the cost of buying a commercial one).
But it's not so much a question of the equipment, you first need to find out if you're even alllowed to do it, and what licences are required - presumably you can't just start broadcasting interference willy nilly?.
Do any Uni's in India have their own radio stations?, if so contact them and ask about the procedure.