The Advantest U3751 portable spectrum analyzer supports a great range of applications, from use on production lines to system installation and maintenance.  Its digital IF enables dramatic improvements in power measurement accuracy for digitally modulated signals.  Moreover, the U3751 provides twice the throughput of its predecessor.
Features:
Better measuring speed due to high-speed processing (twice as fast as its precdecessor)
Dramatically improved power measurement accuracy for digitally modulated signals
Built-in 3 GHz/8 GHz pre-amp standard
Average display noise level: -155 dBm/Hz at 1 GHz, pre-amp ON