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User's Guide ______________________________________________________________________

Basic Troubleshooting

If the antenna operates poorly as a whole, check first that the DC
supply input is found at the end of the antenna cable. If the supply
voltage is in order the fault is possibly in the antenna amplifier.

16 __________________________________________________________________ M210538EN-C

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Summary of Contents for RB31

Page 1: ...Vaisala Telemetry Antenna RB31 USER S GUIDE M210538EN C February 2006 ...

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: ...rt 6 CHAPTER 2 PRODUCT OVERVIEW 7 Introduction to RB31 7 Construction 8 Antenna Segments 8 Antenna Amplifier and Switch RBD121 9 CHAPTER 3 INSTALLATION 11 Installation Site 11 Unpacking 11 Antenna Base Installation 12 Assembling the Antenna 12 CHAPTER 4 OPERATION 13 General 13 Operation Modes 13 Options 14 Long Antenna Cables 14 CHAPTER 5 MAINTENANCE 15 Avoiding Corrosion 15 Disassembling the Ante...

Page 4: ...________________________________________________________________ CHAPTER 6 TECHNICAL DATA 17 CHAPTER 7 PARTS LIST 19 CHAPTER 8 DRAWINGS 23 2 ___________________________________________________________________ M210538EN C ...

Page 5: ...or the manual and the product Chapter 2 Product Overview gives a general description of the RB31 system Chapter 3 Installation explains about unpacking and setting up the antenna Chapter 4 Operation provides additional information for the users of the RB31 system Chapter 5 Maintenance provides information on servicing operations Chapter 6 Technical Data provides the technical specifications Chapte...

Page 6: ...ntial hazard If you do not read and follow instructions carefully at this point the product could be damaged or important data could be lost NOTE Note highlights important information on using the product Feedback Vaisala Customer Documentation Team welcomes your comments and suggestions on the quality and usefulness of this publication If you find errors or have other suggestions for improvement ...

Page 7: ...y 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 workbench When this is not possible ground yourself t...

Page 8: ...pplicable supply contract or Conditions of Sale for details of the warranty for each product Technical Support For technical questions contact the Vaisala technical support E mail helpdesk vaisala com Fax 358 9 8949 2790 If the product needs repair please follow the instructions below to speed up the process and to avoid extra costs to you 1 Read the warranty information 2 Contact Vaisala technica...

Page 9: ...teorological band RB31 can be used in conjunction with the Vaisala DigiCORA equipped with Vaisala Sounding Processing Subsystem SPS311 The main idea when planning the antenna arrangement was to obtain a radiation pattern providing a good signal during sounding under any wind conditions RB31 is well suited for use in fixed installations The antenna has no moving parts the radiation pattern of the a...

Page 10: ...n the radiosonde and the receiver is at its greatest and the field intensity at its weakest The gain of an antenna element at 0 elevation angle is 12 dB over 1 2 wave antenna For the upwards direction or high elevation angles the antenna is equipped with a cross dipole The cross dipole has radiators bent down to enable the antenna to receive transmissions having extensive polarization fluctuation ...

Page 11: ...h East S South SW South West and 90 upwards The OUT connector is connected to the cable from output terminal of RB31 on the through hole plate The other terminals are connected to the antenna radiators 90 to the cross dipole and the others to the corner radiator of the marked direction Figure 2 shows the cabling scheme of an RBD121 unit 0312 117 Figure 2 Cabling Principle of RDB121 Unit For more d...

Page 12: ...User s Guide ______________________________________________________________________ This page intentionally left blank 10 __________________________________________________________________ M210538EN C ...

Page 13: ... some attenuation but is usually no hindrance Antenna masts and other similar metal structures of a small diameter do not normally disturb reception to a serious extent if more than 20 meters away Metal roofs and other corresponding large surfaces can reflect signals in some instances causing fading of short duration A large metal structure or a building screens the antenna and reception through i...

Page 14: ...r at the antenna base The green yellow ground cable is connected to the nearest grounding point On shipboard installations this is the antenna support pipe On roof mounting or terrain installations the ground cable can be extended if necessary for connection to a proper ground point for example to a water conduit or heating pipe a metal structure or other comparable object For connecting the anten...

Page 15: ... of which one at a time is connected to for the reception Selection is made between seven directions North N North East NE South East SE South S South West SW North West NW and Upwards 90 Antenna segment is selectable either automatically or manually Refer to the DigiCORA User s Guide for details on manual and automatic operation modes In automatic mode the antenna element giving the highest signa...

Page 16: ...lengths are possible but for full system performance the attenuation of the antenna cable should be less than 10 dB With different cable types this leads to the following approximate maximum cable lengths Table 1 Approximate Maximum Cable Lengths Cable Type Vaisala Part No Cable Length m Standard cable RG213 U 3969 75 Andrew LDF4 50A 200 Suhner RG213 U 5 90 Nokia AJS 50 3 RG58C U 3053 27 14 ______...

Page 17: ...enna When disassembling the antenna the rim bolts are loosened first See drawing at the end of this manual The cover can then be removed The antenna elements and the cross dipole are accessible If any of the elements is damaged it is replaced At the lower part of the antenna there is a service hatch through which the cables and connectors are accessible For some service operations such as those in...

Page 18: ...ubleshooting If the antenna operates poorly as a whole check first that the DC supply input is found at the end of the antenna cable If the supply voltage is in order the fault is possibly in the antenna amplifier 16 __________________________________________________________________ M210538EN C ...

Page 19: ...Power input 10 12 VDC 130 mA through RF cable Output impedance 50 ohms VSWR 1 5 Telemetry range Telemetry range with RS92 SGP radiosonde 350 km under normal sounding conditions Mechanics Connector Coaxial 7 16 Maximum diameter 1 1 m Height without pedestal 0 8 m Height with pedestal 1 55 m Weight 32 kg Standard cable length 33 m greater lengths possible with low loss cable Environmental Conditions...

Page 20: ...User s Guide ______________________________________________________________________ This page intentionally left blank 18 __________________________________________________________________ M210538EN C ...

Page 21: ...Coaxial Connector type 716 angle plug Suhner 11 716 50 0 2C X2 2503 Coaxial Connector Suhner 16N 50 7 9C N type 90 male 0567 Wire Tie black PA 66 Panduit 00705 25pcs 0971 Plastic bag Minigrip 160x250 PE 0 05 026 212262 Type Label for RB31 025 Ground Symbol Label 024 N Label RB MEKA RB21 RB31 Mechanics 60220 Shield RB3289 0944 Hex tapped spacer 5 M3 15 3 pcs 15468 N adapter 53N 50 0 1 male fem 2407...

Page 22: ...ew M6x30 DIN 84 4 pcs 4340 Spring washer B6 DIN 127 4 pcs 4814 Hexagon nut M6 DIN 934 4 pcs 4777 Plain washer A10 5 DIN 125 3 pcs 4342 Spring washer B10 DIN 127 3 pcs 3069 Hexagon nut M10 DIN 934 3 pcs 4458 Slot screw M6x16 DIN 84 2 pcs 4340 Spring washer B6 DIN 127 2 pcs 4814 Hexagon nut M6 DIN 934 2 pcs 12866 Hexagon screw M8x50 DIN 933 12669 Star washer A8 4 DIN 6798 6 pcs 4815 Hexagon nut M8 D...

Page 23: ...M10 DIN 934 8 pcs 4342 Spring washer B10 DIN 127 4 pcs 4777 Plain washer A10 5 DIN 125 8 pcs 60172 Stud M10x150 4 pcs 0952 Wedge bolt M10 4 pcs RB4300 Internal connection cable 7 pcs 15292 BNC angle PCB cable receptacle Suhner type 86BNC 50 3 3 15298 N type panel jack Suhner type 24N 50 3 10C 3053 Coaxial cable AJS 50 3 RB4299 Internal connection cable 1 pc 15292 BNC angle PCB cable receptacle Suh...

Page 24: ...User s Guide ______________________________________________________________________ This page intentionally left blank 22 __________________________________________________________________ M210538EN C ...

Page 25: ...ential drawings for Telemetry Antenna RB31 Table 4 List of Drawings Description Drawing Code RB31 Antenna Assembly Drawing DRW214844 RB31 Antenna Exploded View DRW215823 RB31 Cabling Assembly Drawing DRW214883 See the following pages for illustrations VAISALA _______________________________________________________________________ 23 ...

Page 26: ...User s Guide ______________________________________________________________________ 24 __________________________________________________________________ M210538EN C ...

Page 27: ...Chapter 8 _________________________________________________________________Drawings VAISALA _______________________________________________________________________ 25 ...

Page 28: ...User s Guide ______________________________________________________________________ 26 __________________________________________________________________ M210538EN C ...

Page 29: ... 35 12669 3 Star washer A8 4 DIN6798 36 4815 2 Hexagon nut M8 DIN934 37 25015 18 Cross head screw M3 x 8 DIN7985Z 38 3939 18 Spring washer B3 DIN127 39 4776 18 Hexagon nut M3 DIN934 40 3823 8 Socket head screw M8 x 30 DIN912 41 12510 8 Plain washer D25 8 4 DIN9021 42 12511 8 Rubber washer 25 8 x 2 43 4818 8 Plain washer A8 4 DIN 125 44 4341 8 Spring washer B8 DIN127 45 4815 8 Hexagon nut M8 DIN934...

Page 30: ...User s Guide ______________________________________________________________________ 28 __________________________________________________________________ M210538EN C ...

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