The RSS-6000 is a continuous wave USB Signal Generator from Spartant that operates from 25 MHz to 6 GHz. It can generate a signal with power that ranges from -27 to 10 dBm that has a phase noise of -106 dBc/Hz @100 kHz @ 250-1000 MHz. This signal generator is extremely compact, about the size of a deck of cards, measuring 0.90 H x 2.82 W x 4.04 D.