The IQRB-1 from IQD Frequency Products is a Sub-Miniature Rubidium Oscillator that operates at 10 MHz. It has excellent frequency stability of ±0.05 ppb, aging of ±0.005 ppb/day, and ±0.05 ppb/month. The frequency stability of this sub-miniature atomic clock is about 1,000 times more accurate than a typical OCXO. The oscillator provides a sinewave output with a phase noise of -150 dBc/Hz @ 100kHz. It requires a DC supply of 12-18 V and draws less than 1.7 A of current. The oscillator is available in a 65cc OCXO style package that measures 50.8 x 50.8 x 25.0 mm. It is ideal as a stand-alone frequency source, for synchronization of or as reference for satellite & secure communications, navigation systems in financial, utility, security, and communications timing applications.