Aiming at applications requiring extremely low phase noise, such as testing radar systems and wireless communications networks, the Agilent E8663B RF/microwave signal generator provides extremely low phase noise in two versions covering 100 kHz to 3.2 GHz and 100 kHz to 9 GHz. The Agilent E8663B is fully synthesized, with output signals stabilized to an internal oven-controlled crystal oscillator with ageing rate of better than 2.5 x 1010/day after 30 days. The residual phase noise that is typically 89 dBc/Hz or better offset 1 Hz from a 1-GHz carrier signal. For the 1-GHz carrier, the phase noise is typically 107 dBc/Hz offset 10 Hz from the carrier, -119 dBc/Hz offset 100 Hz from the carrier, -126 dBc/Hz offset 1 kHz from the carrier, -134 dBc/Hz offset 10 kHz from the carrier. Nonharmonic spurious levels are typically 70 dBc or better at all frequencies. For more information, see the full review in the May issue of Penton's Military Electronics digital magazine, or visit the Agilent website at