NAELCOM - Thunderbolt E GPS Discplined Clock - Horloge GPS pour infrastructure sans fil.

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Thunderbolt E
GPS Disciplined Clock

Support

Data Sheet

Thunderbolt E Quick Start Guide

DSPMon V1-53.zip

Thunderbolt E User Guide

Precise GPS Clock for wireless infrastructure

The.Trimble® Thunderbolt® E GPS Disciplined Clock.is.Trimble’s latest offering for GPS synchronization devices targeting the wireless infrastructure. This fifth-generation GPS clock combines a 12-channel GPS receiver, control circuitry, and a highquality ovenized oscillator on a single board, providing increased integrity and reliability at a lower size and cost.

The Thunderbolt E'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 Thunderbolt E GPS clock a natural for CDMA clock, the digital standard for cellular phones.

The Thunderbolt E 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 accomodates applications requiring sub-microsecond timing.

The Trimble T-RAIM (Time-Receiver Autonomous Integrity Monitor) algorithm is used to monitor satellites to ensure signal integrity.

Matching the Thunderbolt E GPS Clock with the Trimble Bullet antenna creates a system that provides reliable performance in hostile R/F environments. The system can be easily calibrated for different cable lengths.

The high level of integration and volume production techniques make the Thunderbolt E GPS Disciplined Clock an extremly cost-competitive timing solution for volume synchronization applications.

Thunderbolt E - Technical Data

Performance Specifications :

General:

L1 (1575.42 MHz) Frequency, C/A Code (SPS), 12-channel, continuous tracking receiver

Update rate:

1 HZ

PPS accuracy:

UTC 15 nanoseconds (one sigma)

10 MHz accuracy

1.16 x 10 -¹² (one day average)

:10 MHz stability

See graph below

Harmonic level

-40 dBc/Hz max

Spurious

-70 dBc/Hz

Phase noise

10 Hz	-120 dBc/Hz
100 Hz	-135 dBc/Hz
1 kHz	-135 dBc/Hz
10 kHz	-145 dBc/Hz
100 kHz	-145 dBc/Hz

Typical Performance

Interface Specifications :

Prime power

+24V and return using DC to DC power supply (19V to 34V)
Mechanical connection uses a two-pin locking connector.

1 PPS

BNC connector TTL levels into 50 ohm, 10 microseconds-wide pulse with the leading edge synchronized to UTC within 15 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 7 dBm ±2 into 50 ohm

Serial interface

RS-232 through a DB-9 connector

RF antenna connector

BNC

Serial protocol

Trimble Standard Interface Protocol (TSIP) binary protocol @ 9600, 8-None-1

Physical Charcteristics

Power consumption:

15 watts cold; 10 watts steady state

Dimensions

5" L x 4" W x 2" H (127mm x 102mm x 40mm)

Mounting

Six mounting holes for #6-32 screws. Max. depth 3/8"

Weight

0.628 lbs (0.285 kg)

Environmental Specifications :

Operating Temperature:

0° C to +60° C

Storage Temperature:

-40° C to +85° C

Operating Humidity:

95% (non-condensing)