The 8643A RF Signal Generator covers the range from 0.252 to 1030 MHz with a resolution of 0.01 Hz. Spectral purity of SSB phase noise @ 1 GHz is 130 dBc/Hz. Output level is variable from +13 to 137 dBm. Absolute accuracy 1 dB. Output can be amplitude modulated from 0 to 100%. Maximum peak deviation on FM is 1 MHz, form 515 MHz to 1030 MHz. It can be digitally stepped swept over the entire frequency range. Remote programming is via HP-IB.