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Summary of Contents for TimeTools T Series
- Page 1 T-Series NTP Network Time Server GPS/GNSS Antenna Installation Guide Models Covered: T100, T300, T550 Ducument Number: T1202-02 18 November 2020 The latest version of this user guide can be obtained from TimeToolsLtd.com.
- Page 2 Full product documentation can be found at TimeToolsLtd.com. While reasonable efforts have been taken in the preparation of this document to ensure its accuracy, TimeTools Limited assumes no liability resulting from any errors or omissions in this manual, or from the use of the information contained herein.
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Page 3: Table Of Contents
5.1. Grounding Coax Cables............................13 6. Typical GPS/GNSS Installation....................... 14 7. Indoor Operation............................15 8. GPS/GNSS Receiver Site Survey and Signal Lock................16 8.1. Signal Lock Problems............................16 9. Tips and Trouble Shooting........................17 2020 TimeTools Limited. All Rights Reserved. - Page 4 GPS/GNSS Antenna Installation Guide Page 4 Revision History Date Doc. Rev. Changes 27-Jan-17 T1202-01 Initial release. 18-Nov-20 T1202-02 Updated surge-suppressor and coaxial cable grounding installation instructions. 2020 TimeTools Limited. All Rights Reserved.
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Page 5: Introduction
However, satisfactory operation can often be achieved by citing the antenna on the side of a building, on a window sill or in some circumstances indoors. 2020 TimeTools Limited. All Rights Reserved. -
Page 6: Antenna Types
The GNSS signals are spread spectrum signals in the 1551MHz to 1614MHz range and do not penetrate conductive or opaque surfaces. Therefore, ideally, the antenna should be located outdoors with a clear view of the sky. TimeTools supplies two different types of antenna with T-Series NTP servers: T-3040 Permanent-Mount GPS L1 Antenna - T100 and T300 models. -
Page 7: Mounting Bracket (T-3070/T-3740 Antennas)
Mounting bracket (T-3070/T-3740 Antennas) TimeTools provides a mounting bracket for use with T-3070 and T-3740 antennas. The bracket can be used to mount the antenna to a vertical surface such as a wall or fascia. The mount is also supplied with a 1.5” V-bolt, which can be used to mount the antenna to a pole or mast, if required. -
Page 8: Antenna Placement
The receiver’s DOP filter rejects fixes with high DOP (high uncertainty), therefore it can take longer to get the first acceptable fix if sky visibility is partly obstructed. WARNING: Any local installation regulations for rooftop antennas in the country where the antenna is installed must be observed. 2020 TimeTools Limited. All Rights Reserved. -
Page 9: Antenna Cabling
Optional pre-terminated cable lengths of 10m, 30m, 50m and 100m are available for the T-3040 and T-3740 antennas, supplied with the T100, T300 and T550 models . Customers are free to source and utilise their own cables, if required, provided TimeTools recommendations are observed. -
Page 10: Connector Types
4.4. Connector Types TimeTools GPS and Multi-GNSS systems utilise coax cable and connectors of 50 ohm impedance. Both cable and connector specification should have an operating frequency of at least 1575 MHz. The T-Series NTP server and T-3040/ T-3740 antenna require a TNC type male connector on the attached cable. -
Page 11: Gps Over Fibre Solutions
4.5.2. GPS Over Fibre Solutions For extremely long cable runs or in very secure environments, TimeTools GPS Over Fibre kit can be used to transmit GPS signals over optical fibre. Please refer to TimeTools GPS over fibre kit data sheet for more information. -
Page 12: Gnss Antenna Surge Protection
The surge suppressor provides surge protection and grounding of coax cables. The SPP-GPS surge suppressor has a weather-proof enclosure. It is suitable for indoor or outdoor installation. TimeTools recommends that the suppressor is fitted indoor, as close to where the coax cable enters the building as possible. -
Page 13: Grounding Coax Cables
Close the clamp and tighten the fixing screw. Ensure that the clamp tightly grips the coax outer braiding. 4. Fix the Grounding-Kit cable lug to an equipotential bonding terminal (PE). The DC resistance to the nearest point of equipotential bonding (PE) shall be lower than 5 Ω. 2020 TimeTools Limited. All Rights Reserved. -
Page 14: Typical Gps/Gnss Installation
GPS/GNSS Antenna Installation Guide Page 14 6. Typical GPS/GNSS Installation Fig: Typical Antenna installation 2020 TimeTools Limited. All Rights Reserved. -
Page 15: Indoor Operation
GPS/GNSS Antenna Installation Guide Page 15 7. Indoor Operation TimeTools T-Series NTP servers have cutting-edge high sensitivity GPS/GNSS timing receivers designed for static operation. The receivers high sensitivity mode often allows GPS/GNSS signals to be received with an antenna located indoors or in a window This can considerably reduce installation costs and potentially eliminate the need for surge suppression. -
Page 16: Gps/Gnss Receiver Site Survey And Signal Lock
2020 TimeTools Limited. All Rights Reserved. -
Page 17: Tips And Trouble Shooting
However, in challenging conditions, such as indoor antenna location, or if the antenna has a much reduced view of the sky, it can take much longer to acquire a signal lock. In such circumstances, TimeTools recommends that the device be left for around 1 hour after power-up in order to try to achieve a signal lock.
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