Rolta India Ltd. Offers Software Defined Mobile Radios. Rolta India Ltd. Is an ISO 9001:2000 registered organization. The Software Defined Mobile Radios is used for Defense & Homeland Security. In Software Defined Mobile Radios, the high data rate ranges from 256 Kbps up to 6 Mbps. The frequency ranges from V/UHF from 30 MHz to 512 MHz.