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Thunderbolt gps disciplined clock/trimble precise clock
Precise GPS Clock for Wireless Infrastructure The Thunderbolt GPS Disciplined Clock is Trimble s latest offering for GPS synchronization devices targeting the wireless infrastructure. This fourth-generation GPS clock combines an 8-channel GPS receiver, control circuitry and a high-quality ovenized oscillator on a single board, providing increased integrity and reliability at a lower size and cost.
The GPS clock s level of integration makes it a perfect solution for precise timing applications in the wireless industry.
Among its uses are synchronizing the E911 positioning infrastructure and maximizing bandwidth for wireless local loop.
The architecture is comparable to systems currently used to maintain the tough CDMA holdover specification. This makes the hunderbolt GPS clock a natural for a CDMA clock, the digital standard for cellular phones.
Trimble s approach is unique. The Thunderbolt GPS Clock outputs a 10 MHz reference signal and a 1 PPS signal with an over-determined solution synchronized to GPS or UTC time. The 10 MHz reference accommodates applications requiring sub-microsecond timing.
A single microprocessor performs both the GPS navigation and oscillator disciplining functions.
The GPS receiver is driven directly by the 10 MHz output signal of the oscillator. This is calibrated against the incoming GPS signal, with the resulting clock and frequency measurements fed into the oscillator frequency control algorithm.
The T-RAIM (Time-Receiver Autonomous Integrity Monitor) algorithm is used to monitor satellites to ensure signal integrity.
Matching the Thunderbolt GPS Clock with Trimble s Bullet antenna creates a system thatprovides reliable performance in hostile environments. The system can be easily calibrated for different cable lengths.
The high level of integration and volume production techniques make the Thunderbolt GPS Disciplined Clock an extremely cost-competitive timing solution for volume synchronization applications. Key Features and Benefits
Ovenized quartz oscillator provides clean 10 MHz (1 PPS) signal that maximizes bandwidth
Combined GPS receiver and ovenized oscillator minimizes size and cost High volume manufacturing provides reliable low-cost products PERFORMANCE SPECIFICATIONS
General: L1 frequency, CA/code (SPS), 8-channel continuous tracking receiver
PPS accuracy: UTC 20 nanoseconds (one sigma)
10 MHz accuracy: 1.16 x 10-12 (one day average)
Phase noise: 10 Hz 120 dBc/Hz
Holdover: 1 microsecond over 2 hours with a maximum
increased holdover performance, please contact your local Trimble representative. ENVIRONMENTAL SPECIFICATIONS:Operating temp: 0 C to +60 C
Operating humidity: 95% non-condensing
Maximum altitude: 18,000 m INTERFACE SPECIFICATIONSPrime power:
Board alone uses +12V, 12V, +5V and ground. Note: For more details about the power supply, please refer to:http://trl.trimble.com/dscgi/ds.py/Get/File-10001/ThunderBoltBook2003.pdf ThunderBolt GPS Disciplined Clock User Guide Version 5.0 - 3.2 Power Connector Pin-Out and Part Numbers) The GPS clock needs a 15 watts triple voltage output(+12/-12/+5v) power supply. We have 30 Watt switching power supply(Brand:Mean Well. Model: T-30B It is the best know brand, its components come from Japan). http:// /search/T-30 : C$24 plus C$12(postage)
1 PPS: BNC Connector TTL levels into 50 ?
10 microseconds-wide pulse with the leading edge synchronized to UTC within 20 nanoseconds (one sigma) in static, time only mode. The rising time is <20 nanoseconds and the pulse shape is affected by the distributed capacitance of the interface cable/circuit.
10 MHz: BNC connector. Waveform is sinusoidal +12.5 dBm 2.5 dBm into 50 ?
Serial interface: RS-232 through a DB-9 connector
Serial protocol: Trimble Standard Interface Protocol (TSIP) binary protocol @ 9600, 8-None-1 Here is the kernel:
Optional starter kit: Gold plated pins, connectors:
