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Vaisala VLF Antenna

CA31

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SER

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S

G

UIDE

M210761EN-A

February 2006

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Summary of Contents for CA31

Page 1: ...Vaisala VLF Antenna CA31 USER S GUIDE M210761EN A 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: ...DUCT OVERVIEW 7 Introduction to Vaisala VLF Antenna CA31 7 CHAPTER 3 INSTALLATION AND OPERATION 11 Selecting Location 11 Lightning Protection 11 Mounting 12 Antenna Amplifier 12 VLF Signals 13 Loran C Signals 13 CHAPTER 4 MAINTENANCE 15 Periodic Maintenance 15 Parts List for Consumables 15 CHAPTER 5 TROUBLESHOOTING 17 Troubleshooting Procedure 17 Technical Support 18 CHAPTER 6 TECHNICAL DATA 19 Sp...

Page 4: ...User s Guide ______________________________________________________________________ This page intentionally left blank 2 ___________________________________________________________________ M210761EN A ...

Page 5: ...nformation provides general notes for the manual and the product Chapter 2 Product Overview introduces the features and system structure of CA31 Chapter 3 Installation and Operation provides you with information about installing and operating this product Chapter 4 Maintenance describes the basic maintenance of the product Chapter 5 Troubleshooting describes the troubleshooting procedure and provi...

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: ...rotected 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 to t...

Page 8: ...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 6 ______________________...

Page 9: ...VLF antenna amplifier is designed for reception of VLF signals in the 10 to 30 kHz band and Loran C signals of 100 kHz band The antenna amplifier is mounted to the side of the antenna stand with clamps The signal from the antenna whip is connected via the antenna amplifier to the sounding system The antenna has a steel and glass fiber construction It consists of a whip extension and stand The ante...

Page 10: ...antenna system consists of the following components the numbers refer to Figure 1 1 Whip antenna 2 Extension stand 3 Antenna stand 4 Cable tie 5 Gasket 6 Antenna amplifier 7 Cable from antenna to amplifier 16272ZZ 8 Cable from amplifier to a sounding system 8 ___________________________________________________________________ M210761EN A ...

Page 11: ...he antenna system contains Guying wire set Clamp 16238 CA 2 pcs Grounding cable The guying wire set is used for additional mounting strength The clamps attach the amplifier to the antenna stand The grounding cable is used for grounding of the antenna stand VAISALA ________________________________________________________________________ 9 ...

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Page 13: ... amplifier body properly to ensure good signal reception Lightning Protection The CA31 contains a discharge tube with 90 V threshold for lightning protection The tube is placed inside the CAA amplifier housing and connected between the cable to the whip antenna and housing wall The tube protects the amplifier against high voltage surges on its circuit board Proper grounding is also essential for l...

Page 14: ...80 mm 0602 010 Figure 2 CA31 Stand Base Plate Dimensions Antenna Amplifier The navigation signal comes from the receiving whip antenna to the connector X1 F1 is an overvoltage protection Internally the signal path is divided to two branches VLF 15 kHz 30 kHz signals go to the branch provided with R3 Loran C signals 100 kHz go to the branch provided with the tuned series circuit L5 C14 Connector X2...

Page 15: ... amplifier and impedance matching device L3 2 2 mH prevents attenuation of Loran C signals since both amplifiers have a common output terminal X2 Loran C Signals In the Loran C amplifier branch there are voltage limiting diodes V6 and V7 C10 L6 is tuned for 100 kHz V9 2N 3904 is a voltage amplifier After V9 there is a gain control potentiometer R10 A1 is a linear circuit amplifier the output of wh...

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Page 17: ...e protection F1 if burned out Generally the protection F1 is short circuited in this occasion Also if the resistor R3 is burned replace it with a new one If the damage cannot be repaired with these measures replace the entire circuit board Parts List for Consumables Table 1 CA31 Available Spare Parts Spare Part Order Code Antenna amplifier CAA21 15633 Cable to a sounding system DRW217931 33 m DRW2...

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Page 19: ...port consisting of the following issues What failed what worked did not work Where did it fail location and environment When did it fail date immediately after a while periodically randomly What was connected to the product and to which connectors Input power source type voltage and list of other items lighting heaters motors etc that were connected to the same power output What was done when the ...

Page 20: ...tions below to speed up the process and to avoid extra costs to you 1 Read the warranty information 2 Contact Vaisala technical support via e mail or fax and request for RMA Return Material Authorization and shipping instructions 3 Proceed as instructed by Vaisala technical support NOTE RMA must always be requested from Vaisala technical support before returning any faulty material 18 ____________...

Page 21: ...aced in a square 80 mm Diameter of hole 11 5 mm Weight 3 kg Overall packing length 260 cm Table 3 Antenna Amplifier Specifications Property Description Value VLF 10 kHz 30 kHz 3 dB Frequency bands Loran C 100 kHz 10 20 kHz 3 dB 10 kHz 30 kHz 28 42 dB Gain 100 kHz 45 50 dB Operating temperature 40 C 75 C Connectors Type N Impedances input 100 kΩ output 1 kΩ Power supply feed through the coaxial sig...

Page 22: ... R15 5388 10 k 1 0 25 W Potentiometers R10 5744 2 k 0 5 W Capacitors C1 C19 5734 100 p 2 63 V C2 C3 C11 6920 10 u 20 35 V C4 C12 C13 C17 C18 0977 100 n 10 63 V C5 5728 33 p 2 63 V C6 5735 120 p 2 63 V C7 5497 47 n 10 250 V C8 C10 C15 C21 15048 1 n 5 100 V C14 5729 39 p 2 63 V C16 3769 47 n 10 63 V C20 3258 100 u 20 20 V Overvoltage Protectors F1 1070 A71 C90 90 V 10kA 5 A Coils L1 Ref drawing CA 4...

Page 23: ...le 5 Vaisala VLF Antenna CA31 Parts List Reference Part No Description X1 4323 11BNC 50 3 4C connector X1 4455 22BNC 50 0 5 connector X2 6581 21N 50 3 5C N connector 16272 ZZ AJS 50 3 coaxial cable 50 ohm PVC VAISALA _______________________________________________________________________ 21 ...

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