Military version of 8642B. The 8642M Synthesized Signal Generator is a high performance, programmable generator for use in demanding RF measurement applications. Frequency range: 100 kHz to 2.115 GHz 1 Hz frequency resolution Output level: +15 dBm to 140 dBm High accuracy attenuator and output level Non harmonic spurious below 100 dBc (to 1 GHz) Low SSB phase noise of 134 dBc/Hz at 1 GHz (20 kHz offsets) Provides AM, FM, Pulse, and Phase modulation.