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Vaisala Telemetry Antenna RB31 UIDE M210538EN-C February 2006...
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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 the applicable supply contract or...
- Chapter 5, Maintenance, provides information on servicing operations. - Chapter 6, Technical Data, provides the technical specifications. - Chapter 7, Parts List, contains the parts list for Vaisala Telemetry Antenna RB31. - Chapter 8, Drawings, contains the essential drawings for Telemetry Antenna RB31.
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, please indicate the chapter, section, and page number. You can send comments to us by e-mail: manuals@vaisala.com...
Chapter 1 ________________________________________________________ General Information Product Related Safety Precautions The Vaisala Telemetry Antenna RB31 delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions: WARNING Ground the product, and verify outdoor installation grounding periodically to minimize shock hazard.
If the product needs repair, please follow the instructions below to speed up the process and to avoid extra costs to you. Read the warranty information. Contact Vaisala technical support via e-mail or fax and request for RMA (Return Material Authorization) and shipping instructions.
RB31 is well-suited for use in fixed installations. The antenna has no moving parts; the radiation pattern of the antenna can be electrically directed to track the flying radiosonde.
User's Guide ______________________________________________________________________ Construction Vaisala Telemetry Antenna RB31 consists of the directional antenna segments, Antenna Amplifier and Switch RBD121, radome, antenna base, and antenna cable. Antenna Segments The antenna consists of six antenna segments for horizontal reception and one segment for upwards direction.
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.
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The Antenna is delivered as a single functional unit including the radome and the internal parts (antenna elements, antenna amplifier and switch) with all connections completed. Therefore, unpacking is a simple operation and requires no special instructions. VAISALA _______________________________________________________________________ 11...
User's Guide ______________________________________________________________________ Antenna Base Installation For antenna base installation, refer to assembly drawing DRW214844 at the end of this manual. Assembling the Antenna The antenna is installed with the "N" side pointing to the north. The antenna cable is connected to the corresponding connector at the antenna base.
Chapter 4 ________________________________________________________________ Operation CHAPTER 4 OPERATION This chapter provides additional information for the users of the RB31 system. General Vaisala Telemetry Antenna RB31 can be used in conjunction with the Vaisala DigiCORA® equipped with Vaisala Sounding Processing Subsystem SPS311.
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 Andrew LDF4-50A Suhner RG213/U-5...
Switch, the dome must be removed and the antenna reflector plate tilted upwards. In case any of the antenna elements seems to be insensitive, the most common reason is a loose cable connector or a malfunction in the antenna switching unit. VAISALA _______________________________________________________________________ 15...
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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Chapter 6 ____________________________________________________________ Technical Data CHAPTER 6 TECHNICAL DATA This chapter provides the technical specifications. Table 2 Telemetry Antenna RB31 Specifications Feature Specification Antenna Frequency range 400 … 406 MHz Horizontal directivity 8 dBi Vertical directivity -3 dBi Polarization near horizon...
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Chapter 7 _________________________________________________________________Parts List CHAPTER 7 PARTS LIST This chapter contains the parts list for Vaisala Telemetry Antenna RB31. Table 3 Parts List for Telemetry Antenna RB31 Ref. Part no. Item DRW214844 RB31 Antenna Drawing DRW214860 Type Label for RB31 Antenna...
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User's Guide ______________________________________________________________________ 4337 Spring washer B4 DIN 127 (4 pcs) 4812 Hexagon nut M4 DIN 934 (4 pcs) – Slot screw M6x8 DIN 84 (4 pcs) – Spring washer B6 DIN 127 – Cross head screw M6x25, special 2634 Mounting flange (alt.
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DRAWINGS This chapter contains the essential 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.
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