The 30th National Radio Science Conference NRSC 2013, will be held in Cairo Egypt. The National Telecommunication Institute will host the conference during the period from 16-18 April 2013. The conference program will consist of invited sessions on selected topics and contributed sessions. The submitted papers must describe original work and cover the activities of the URSI commissions A-K, namely: A - Electromagnetic metrology B - Fields and waves C - Wireless communications and signal processing D - Electronics and photonics E - Electromagnetic noise and interference F - Wave propagation and remote G - Ionospheric radio and propagation H - Waves in plasma I - Radio astronomy K - Electromagnetic in biology and medicine