Communication Systems

Frequency Stability

Rubidium Standards

Rubidium Standards


The Quartzlock A1000 Frequency Reference is a 1U rack-mounted Rubidium Atomic Clock based instrument. Exceptionally low drift is a unique parameter for the A1000. The hourly and daily stability and drift performance are "best available", typically 8x10-13/day, at the 10 MHz, low distortion, sine wave, 50 Ohm output.

Very high reliability stems from the physics package and Quartzlock's electronics. Long-term production has led to MTBFs of well over 1, 00,000 hours.

The A1000 Frequency Reference has a high reliability inbuilt 110-240 V AC power supply with low noise characteristics.

The A1000 can accommodate many "standard" options to suit specific applications. Multiple outputs, alternative output frequencies to the standard 10 MHz. Mixed output frequencies and ultra-low noise and highest short-term stability options all set the A1000 apart from any other 1U frequency reference at -123 dBc/1Hz for 5 MHz and -170 dBc/100kHz for 10 MHz outputs.

Applications include: Space ground control frequency referencing, wired and wireless telecom network synchronisation, HDTV and other AM, FM satcom (Satellite Communications Equipment) and broadcast TX applications.


The Quartzlock E10-P Portable Rubidium Frequency Reference is a miniature rechargeable Atomic Clock with 10 MHz sine-wave 50 Ohm output.

Recharging/operating from internal 12 V DC, this miniature enclosure, only 103x55x122 mm in size, has all the performance needed for on-site calibrations, referencing and portable transfer standard applications. Quartzlock's SMAC (sub-miniature atomic clock) technology far outperforms chip scale atomic clock devices with poor AVAR and phase noise.

The E10-P is hand-held, with less than 500g mass, and is one of the smallest and lightest atomic clocks with -95 dBc/Hz Phase Noise and 8x10-12/100 s stability (100 x better than any OCXO).

No antenna or view of sky is required as the E10-P is a completely independent atomic reference.

Applications include: Remote site cellular BTS transmitter and satellite communications ground station frequency referencing for calibration. Field service, low noise (remote from supply line hum & noise) development and short production test use. Noise elimination in referencing for signal sources, spectrum analysers, network analysers, subject to lab noise problems.

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