The Advantest R3263 is a 3 GHz spectrum analyzer developed for digital mobile communication equipment. Its basic specifications include a frequency range of 9 kHz to 3 GHz, span accuracy of 1% or less, residual FM of 3 Hzp-p (max.)/0.1 s and drift of 20Hz or less. It comes with CW mode for spectrum analysis and TRANSIENT mode for powerful support of burst wave analysis. It also comes equipped with a burst envelope measurement function for measuring TDMA digital modulated signal ON/OFF characteristics and a burst spectrum measurement function enabling spectrum analysis in the burst ON interval. By adding the GSM Tx Plus Option, measurement of parameters such as GMSK signal frequency and phase errors, and bit synch power can be done at the touch of a button.