Agilent HP E4428C ESG Analog Signal Generator Dc-6 GHz UNB 506 Cal'd Low Noise!Agilent HP E4428C ESG Analog ultra low phase noise and lower harmonics and spurious Signal Generator Which does fast step sweeping . since it has a second low band output you can get dc to 6 GHz with this baby! Has options 506 unb and unj(high performance Signal quality) This can be used for purpose of an LO reference source for phase noise testing systems like the 505x series modules. Since it will likely have 3 6 db lower phase noise than what you