GPS receivers for GPS digital clocks

and GPS time servers

488HS

488HS3-GPS time synchronisation receiver

Overview

The 488HS3-GPS GPS receiver system has been designed to allow 5200 series network time servers to be automatically synchronised from the Global Positioning System – GPS satellite time transmissions. This provides a very precise source of time regardless of global location.

Installation

The 488HS3-GPS GPS receiver system is housed in a single IP65 rated case containing both the active antenna module and the receiver/decoder interface. The IP65 rated protective housing shields the 488HS3-GPS receiver system from wind, rain and snow.
The connection between the 488HS3-GPS GPS time synchronisation system and the 5200 series network time server is by a four core screened twisted pair cable up to 200m long. This cable also provides power to the 488HS3 receiver/decoder module.
The gain pattern of the GPS antenna is designed for full upper hemispherical coverage with the gain diminishing at low elevations. This cross-section is consistent through 360 degrees and so the 3-dimensional gain pattern is a symmetrical spheroid surface.
The 488HS3-GPS receiver system should be horizontally mounted with a clear view of 75% of the sky. If the sky view is reduced, the interval between ‘switch-on’ and system time synchronisation will be considerably increased.
A post mounting clamp is supplied to enable the antenna to be fixed to a suitable horizontal or vertical post of up to 32mm diameter. The antenna may be mounted on the roof of a building or under a suitable skylight.
To ensure ease of operation and to remove the possibility of operator error the 488HS3-GLONASS system is designed to self initialise without the necessity of operator data input. On power-up the receiver will automatically begin to search the sky for all available satellites. After three satellites have been acquired a precise date and time will be calculated from the satellite data transmissions.
To ensure ease of operation and to remove the possibility of operator error the 488HS3-GPS system is designed to self initialise without the necessity of operator data input. On power-up the receiver will automatically begin to search the sky for all available satellites. After three satellites have been acquired a precise date and time will be calculated from the satellite data transmissions.
When the 5000 series network time server is synchronised with the GPS receiver/decoder module all output signals are accurate to within +/- 50uS.

Dimensions

488HS3-gps

Specification

Environment
  • Operating temperature: -25°C to +45°C (ambient)
  • Relative Humidity: 0% to 95% (non-condensing.)
  • Altitude: 0 to 3,000m
  • MTBF > 50,000 hours
Timing accuracy
  • When fully synchronised the 5000 series NTP Ethernet network time server outputs are within ± 50uS
Receiver Architecture
  • 20 channel – capable of simultaneous tracking.
  • Time to first fix – typically less than 1 minute from cold start.
  • Output of verified high accuracy time data – within 10 minutes.
Electrical connections
The Wharton 488HS-GPS synchronisation receiver system is supplied with a captive 25 metre length of 4-core 7/0.2 (0.22mm2) screened cable. For distances of up to 100 metres, the length can be extended by adding an additional length of 7/0.2 cable. For greater distances, up to a maximum of 200 metres, 16/0.2 (0.5mm2) cable should be used.
Electromagnetic Compatibility, Safety and RoHS2 Directives
The Wharton 488HS-GPS synchronisation receiver system, when used in accordance with
our recommendations, comply with the European Community Electromagnetic Compatibility Directive 2004/108/EC, Low
Voltage Directive 2006/95/EC and RoHS2 Directive 2011/65/EU and conform to the following standards:
  • EN 50121-4-2006
  • EN 61000-6-2:2005
  • EN 61000-6-4:2007+A1:2011
  • EN 55022:2010
  • EN55024:2010
  • EN 60950-1:2006