Quartz

Timing Test & Measurement

Timing Solutions

Frequency Reference

Quartz

Quartz Frequency Standard

1000B

1050A

1000B

1050A
Quartz Frequency Standard

Symmetricom's 1050A Quartz Frequency Standard is a multiple output instrument suitable for 19" rack mounting. The instrument features a selected third overtone SC-cut precision quartz crystal with drive levels optimised for very low aging, excellent short and long term frequency stability, and retrace characteristics.

The quartz crystal oscillator exhibits unusually high spectral purity at frequencies close to the carrier frequency permitting multiplication to millimeter-wave frequencies with excellent signal-to-noise ratio. A single stage, solid-state oven, advanced design and careful component selection techniques ensures the instrument's highly stable operation and ruggedness, normally operated from a 115 or 230 VAC, 47 to 400 Hz power source, the instrument also offers a built-in standby battery and internal battery charger. Switch over to this internal battery is automatic in the event of external power failure.

The 1050A satisfies a wide variety of applications with stringent requirements for precision time and frequency in radar systems, missile range timing systems, deep space communications, satellite command terminals, GPS monitoring stations, calibration labs and test equipment.

1000B
Ultra-Stable Quartz Oscillator

Symmetricom's 1000B achieves low aging rates by utilising high performance SC-cut quartz crystal resonators. The specified aging is reached within 30 days of continuous operation, and typically continues to improve. Several users report observed aging rates as low as 1.0E-12 per day after years of continuous operation.

A dewar-insulated oven provides superior temperature stability over the full temperature range. The maximum frequency change over the operating temperature range is <5.0e-9. An oven temperature indicator (10mV per degree K) is provided at the power connector.
The oscillator circuit produces phase noise of -116 dBc at 1 Hz and -160 dBc at 10 kHz. Low noise, high isolation buffer amplifiers provide two or four independent outputs. The buffer amplifiers isolate outputs from load variations. An internal voltage regulator minimises fluctuations due to power supply ripple.
Linearised electronic frequency control allows the use of servo loop techniques for fine frequency tuning. Linearity is better than 5% over the specified tuning range.
The 1000B crystal oscillator meets the demands of a wide range of applications for military and industrial environments. The oscillator is found in precision frequency counters and synthesisers, GPS receivers, microwave multiplier chains, phase noise calibration test equipment, Stratum II telecommunications applications, radar and tactical communications systems, secure communications systems, satellite ground terminals and space flight systems.