Codan-radio Radio Repeater Systems Training Guide Manual do Utilizador Página 60
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TRAINING GUIDE | RADIO REPEATER SYSTEM
Appendix E: Mobile Coverage TestsPage 52
Lay out a route for the mobile with test points approximately 1 km (0.6 miles) apart using your coverage
map as a reference as shown in Figure E-2.
Figure E-2: Mobile Coverage Test Points
This route should include a couple of points that are line-of-sight just to confi rm that everything is
working properly. When the mobile stops at the test point, have it transmit long enough so that you
have time to switch the attenuator to the point where the signal gets noisy just before it disappears.
Have the portable (repeater site) squelch set at the threshold for these tests. Make notes showing the
amount of attenuation necessary to switch the signal into the noise at each test point (use the example
coverage test sheet in Appendix I). When completed, you should have a list of test points, most of which
will be in questionable areas of coverage, with attenuator values noted for each. Next it is necessary
to reduce each of the attenuator fi gures by an amount equal to the average (start of test to end of test)
power output of the mobile in excess of 1 watt.
Office
+ Proposed Site
TP1
TP2
TP3
TP4
TP10
TP11
TP12
Etc.
Etc.
TP = Test Point
4000
5000
3000
6562
5000
3000
5023
4000
- Radio Repeater 1
- Page ii 4
- Page iii 5
- Page iv 6
- Contents 7
- Page vi 8
- INTRODUCTION 9
- Repeater 10
- Portable 10
- Power and telephone lines 13
- Road access 13
- Multi-user mountain-top 13
- Elevation 14
- Plan View 14
- DETERMINING CONFIGURATION 17
- LINKED REPEATER SYSTEMS 19
- OTHER CONFIGURATIONS 23
- REPEATER / BASE STATION 25
- ANTENNAS 28
- Figure 3-1: Antenna Patterns 29
- Typical Horizontal Radiation 31
- BEAM ANTENNA 31
- POWER SUPPLIES 33
- SOLAR SIZING WORKSHEET 35
- ACCOMMODATION 36
- Figure 3-5: Building Types 37
- MAINTENANCE 40
- LIGHTNING PROTECTION 41
- INTERFERENCE 42
- 4/3 EARTH CURVATURE 49
- PATH CALCULATION WORKSHEET 55
- Line-Of-Sight Path 57
- REMOVE WHEN TRANSMITTING 59
- Mechanical Specifications 64
- APPENDIX I: BLANK WORKSHEETS 75
- REPEATER SITE DATA FORM 76
- PATH PROFILE GRAPH 80
- APPENDIX J: GLOSSARY OF TERMS 81
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