The Rubidium signal generator family delivers outstanding signal purity and frequency stability, even at high output power levels, across a broad frequency range of 9 kHz to 43.5 GHz. Coupled with built-in, easy to use, at-location frequency and power calibration capability, Rubidium offers exceptional overall utility and long-term value in a broad range of commercial and military/aerospace measurement applications. Signal purity is critical to a wide range of measurement applications, from radar testing to testing of ADCs and DACs. The Rubidium signal generator offers groundbreaking low single sideband (SSB) phase noise of -136 dBc/Hz (typical) and -140 dBc/Hz (measured) at 10 GHz and 10 kHz offset that is unmatched in the industry. Coupled with best-in-class harmonic and spurious performance, the Rubidium signal generator enables customers to make measurements with better accuracy. The Rubidium offers an order of magnitude better frequency stability compared to other signal generators that use an OCXO based reference. This exceptional frequency stability is achieved either by an optional internal Rubidium reference or by locking the signal generator’s time base to a 1 pps reference from an optional internal GNSS/GPS atomic clock receiver.