Codan-radio Transportable Radio Systems User Guide Bedienungsanleitung PDF herunterladen (Seite 2)

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Table of Contents

1. INTRODUCTION

1.1

ABOUT CODAN......................................................................................................................................................................... Page 4

1.2

INTENDED AUDIENCE.............................................................................................................................................................. Page 4

1.3

HOW THIS GUIDE WORKS..................................................................................................................................................... Page 5

1.4

PURPOSE.................................................................................................................................................................................... Page 5

1.5

TYPICAL APPLICATIONS........................................................................................................................................................... Page 6

1.6

BENEFITS.................................................................................................................................................................................... Page 6

2. SECTION 2 –

REPEATER BASICS

2.1

WHAT IS A REPEATER?.............................................................................................................................................................. Page 7

2.1.1

Simplex Communications................................................................................................................................................... Page 8

2.1.2

Duplex Communications.................................................................................................................................................... Page 8

2.2

HOW DOES A REPEATER WORK?............................................................................................................................................ Page 9

2.3

OTHER TYPES OF REPEATERS.................................................................................................................................................. Page 9

2.3.1

Bi-Directional Ampliﬁ er (BDA)............................................................................................................................................ Page 9

2.3.2

Vehicular Repeater............................................................................................................................................................. Page 10

2.4

BASE STATIONS....................................................................................................................................................................... Page 10

2.5

BENEFITS OF A TRANSPORTABLE RADIO............................................................................................................................ Page 10

2.6

COMPONENTS OF A TRANSPORTABLE RADIO.................................................................................................................. Page 11

2.6.1

Transmitters and Receivers (TX/RX)............................................................................................................................... Page 11

2.6.2

Duplexers............................................................................................................................................................................ Page 12

2.6.3

Antenna............................................................................................................................................................................... Page 13

2.6.4

Enclosure............................................................................................................................................................................. Page 14

2.6.5

Power Supply...................................................................................................................................................................... Page 14

2.7

SUMMARY OF REQUIREMENTS........................................................................................................................................... Page 15

2.8

THE TRADE-OFFS OF A PRACTICAL SOLUTION THAT MEETS YOUR NEEDS................................................................. Page 15

3. SECTION 3 –

REAL WORLD PROBLEMS AND THEIR SOLUTIONS

3.1 NO COVERAGE AREA............................................................................................................................................................. Page 16

3.1.1

Temporary Communications during a Forest Fire....................................................................................................... Page 17

3.1.2

Forest Fire Fighting – Ground to Air Communications................................................................................................Page 17

3.1.3

Search and Rescue in a remote area.............................................................................................................................. Page 18

3.1.4

Communications for Natural Resource Exploration.................................................................................................... Page 19

3.1.5

Scientiﬁ c Research in the Antarctic............................................................................................................................... Page 20

3.1.6

Vehicle Accident in a Valley that has Poor or Inadequate Coverage....................................................................... Page 21

3.1.7

Multi Agency Interoperability – Columbine, Colorado............................................................................................... Page 22

3.1.8

Multi-Agency Interoperability – Alameda County...................................................................................................... Page 22

3.1.9

Coverage in Buildings and Tunnels................................................................................................................................ Page 23

3.2

EXISTING INFRASTRUCTURE FAILURES............................................................................................................................. Page 24

3.3

SPECIAL APPLICATIONS........................................................................................................................................................ Page 25

3.3.1

Secure Undercover Operations........................................................................................................................................ Page 25

3.3.2

Forward Observer/Sniper Communications................................................................................................................. Page 26

3.3.3

Diplomatic Security........................................................................................................................................................... Page 27

3.3.4

Customs Inspection on a Vessel...................................................................................................................................... Page 28

4. SECTION 4 – THE “WORKING” TRANSPORTABLE RADIO

4.1

FEATURES................................................................................................................................................................................Page 29

4.1.1

Analog vs. P25..................................................................................................................................................................................... Page 29

4.1.2

Encryption........................................................................................................................................................................................... Page 29

4.1.3

Conventional or Trunked Channels............................................................................................................................................ Page 30

4.2

TRANSMITTER & RECEIVER (TX/RX)................................................................................................................................................ Page 30

4.2.1

Transmitter.......................................................................................................................................................................................... Page 30

4.2.2

Receiver................................................................................................................................................................................................. Page 30

4.2.3

Transceivers........................................................................................................................................................................................ Page 30

4.2.4

Frequency Bands............................................................................................................................................................................... Page 31

4.3

CALCULATING SYSTEM GAIN AND RANGE................................................................................................................................... Page 32

4.3.1

Transmitter Gains.............................................................................................................................................................................. Page 32

4.3.2

Receiver Sensitivity........................................................................................................................................................................... Page 32

4.3.3

Antenna Gains................................................................................................................................................................................... Page 32

4.3.4

Duplexers............................................................................................................................................................................................. Page 32

4.3.5

Cable Losses........................................................................................................................................................................................ Page 32

4.3.6

Free Space Loss................................................................................................................................................................................... Page 33

4.3.7

Obstruction Losses............................................................................................................................................................................ Pa ge 33

4.3.8

Fade Margin........................................................................................................................................................................................ Page 34

4.3.9

Path Calculation Worksheet......................................................................................................................................................... Page 34

4.4

DUPLEXERS.............................................................................................................................................................................................. Page 35

4.4.1

Isolation............................................................................................................................................................................................... Page 35

4.4.2

How do I provide Isolation to the Repeater?............................................................................................................................ Page 36

4.4.3

Duplexer Characteristics................................................................................................................................................................ Page 37

4.5

ANTENNAS............................................................................................................................................................................................... Page 39

4.5.1

Radiation Patterns and Types........................................................................................................................................................ Page 39

4.5.2

Antenna Size and Characteristics................................................................................................................................................ Page 40

4.5.3

Practical Considerations for your Antenna............................................................................................................................... Pa ge 41

4.6

ENCLOSURES – CHOOSING THE RIGHT CASE.............................................................................................................................. Page 42

4.6.1

Open/Closed Lid Operation........................................................................................................................................................... Page 42

4.6.2

Case Selection..................................................................................................................................................................................... Page 43

4.6.3

Weight................................................................................................................................................................................................... Page 44

4.6.4

Case Size Selection............................................................................................................................................................................ Page 45

4.7

POWER SUPPLIES.................................................................................................................................................................................... Page 46

4.7.1

AC............................................................................................................................................................................................................ Page 46

4.7.2

DC........................................................................................................................................................................................................... Page 47

4.8

OPERATION AND MAINTENANCE................................................................................................................................................... Page 49

5. APPENDIX — REFERENCES

5.1

GLOSSARY................................................................................................................................................................................................. Page 50

5.2

REFERENCE DOCUMENTS.................................................................................................................................................................. Page 51

5.3

TRANSPORTABLE RADIO RFQ SHEET.............................................................................................................................................. Page 52

CONTENTSCONTENTS

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