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USER'S GUIDE

Vaisala GPS Antenna

GA31

M210546EN-C

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Summary of Contents for GA31

Page 1: ...USER S GUIDE Vaisala GPS Antenna GA31 M210546EN C ...

Page 2: ...mechanical including photocopying nor may its contents be communicated to a third party without prior written permission of the copyright holder The contents are subject to change without prior notice Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user All legally binding commitments and agreements are included exclusively in...

Page 3: ...ent 5 Warranty 5 Getting Help 5 CHAPTER 2 PRODUCT OVERVIEW 7 General 7 Construction 7 CHAPTER 3 INSTALLATION 9 Selecting Installation Site 9 Installation 10 CHAPTER 4 OPERATION AND MAINTENANCE 11 Operation 11 Preventive Maintenance 11 CHAPTER 5 SPECIFICATIONS 13 General Specifications 13 CHAPTER 6 PARTS LIST 15 APPENDIX A INSTALLATION DRAWINGS 17 VAISALA ___________________________________________...

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Page 5: ...mation for the product Chapter 2 Product Overview yields a general description of the system Chapter 3 Installation provides information on GA31 installation and on the selection of a suitable site for the antenna Chapter 4 Operation and Maintenance explains about the use of the antenna and about preventive maintenance Chapter 5 Specifications yields the technical specifications for the antenna sy...

Page 6: ...ctronic circuits Vaisala products are adequately protected against ESD for their intended use However it is possible to damage the product by delivering electrostatic discharges when touching removing or inserting any objects inside the equipment housing To make sure you are not delivering high static voltages yourself Handle ESD sensitive components on a properly grounded and protected ESD workbe...

Page 7: ...Warranty For certain products Vaisala normally gives a limited one year warranty Please observe that any such warranty may not be valid in case of damage due to normal wear and tear exceptional operating conditions negligent handling or installation or unauthorized modifications Please see the applicable supply contract or conditions of sale for details of the warranty for each product Getting Hel...

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Page 9: ... band signals The antenna filters amplifies and transfers the signals to the navigation unit for further processing The GA31 differs from GA20 another GPS antenna version in that it includes an N to TNC cable for connecting the antenna to sounding instruments Construction The active GPS Antenna module consists of an L1 frequency antenna element integrated with an internal interference rejection fi...

Page 10: ... 14 pole mount The N connector is located inside the threaded insert allowing the antenna cable to be routed through the pole mount which protects the cable connection from the environment for added reliability The antenna is equipped with a mounting flange at the lower end of the pole 8 ___________________________________________________________________ M210546EN C ...

Page 11: ...view can be tracked without obstruction In some cases it may be required to mount the antenna on an elevated structure to guarantee unobstructed reception A single obstacle has little effect on reception if it is not exceptionally dense or very near the antenna less than 20 meters Sparse forest causes some attenuation but is usually no hindrance Antenna masts and other similar metal structures wit...

Page 12: ...nstallation options see Drawing GA45008 Before attaching the antenna pole to the antenna unit it is recommended to pass the cable through the pole by doing the following 1 To make it easier to slip the cable to the tube first remove the bushing on the top of the pole 2 Loosen two M4 screws and lift the bushing up 3 Pass the cable through the pole 4 Before attaching the cable to the antenna unit pa...

Page 13: ... The cover also protects the parts from rain Nevertheless from time to time it is advisable to inspect the antenna for possible corrosion damage and ensure that the connectors are in good condition When disassembling the antenna element the M4 screws are loosened first The antenna element with the mounting bush can then be removed If the antenna operates poorly as a whole first check that the DC s...

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Page 15: ... Feature Specification Operating temperature 40 C to 85 C Storage temperature 55 C to 100 C LNA power 5V DC 10 Power consumption 22 mA nominal Frequency 1575 MHz Output impedance 50 Ω VSWR 2 1 Gain 35 dB nominal Noise figure 2 7 dB nominal Pass band width 50 MHz Azimuth coverage 360 omni directional Elevation coverage 0 to 90 elevation hemispherical VAISALA ________________________________________...

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Page 17: ...0 DRW216768 Coaxial Cable TNC m N m RG213 33 m 0567 Wire Tie SSTL 1371933 72 94 370 A COM Oy 18436 Clamp D58 75mm stainless AISI 316 AWAB 1495220 2pcs Etola 4185 Allen Key AV 3 0 Zn DIN911 Wurth Ruuvitalo Oy 16267 Washer A10 5 3069 Hex Nut M10 3822 Screw M6 8 4337 Spring Washer B4 4342 Spring Washer B10 4453 Slot Screw M4 12 x CA3224 Pedestal Assembly x 0919CA Guying Wire Set x 4488 Screw M10x40 x...

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Page 19: ...______________________________ Installation Drawings APPENDIX A INSTALLATION DRAWINGS This chapter contains the installation drawing DRW2288818 for GA31 VAISALA _______________________________________________________________________ 17 ...

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Page 21: ...esign Replaces Scale id Title Arch no Serial Sheet doc no Cooperator s Dwg no Rev Ltr Qty Change Reason ECO no Design Date Review Date Appr 1 1 DRW228818 A GPS ANTENNA GA31 INSTALLATION TKK2 080516 1 3 Stud bolt M10x150 Cable tie 58 75 mm Binding tie 2 pcs CASE 2 CASE 1 M6x8 DIN 916 2 pcs 1587 40 77 Length 33 m Coax adapter 18384 18392 Antenna element Pedestal GA35002 Weight 2 55 kg without cables...

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