Codan-radio Radio Repeater Systems Training Guide Manual do Utilizador Página 45
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RADIO REPEATER SYSTEM | TRAINING GUIDE
Appendix A: Drawing Coverage Maps Page 37
A repeater site is proposed at a
high point above the BRIDGE Base
Station. A coverage map is drawn
for the proposed repeater site to
determine if the coverage would be
adequate. Examine the coverage
map of BRIDGE A.R.S. (shown in
Figure A-3) to learn how the map
was drawn. Note the right hand side
of the long fi nger of coverage to the
north where each successive range
of hills blocks off correspondingly
more area. Following is an anaysis
of the section within the square FL.
Our site is at 1372 meters or 4500
feet. Because this particular map
is marked in feet, we’ll use this
measure throughout the remainder
of this section. At the bottom left
of the square we have a good
“drop-off” from our repeater site
in the direction of Skoonka Creek,
therefore we’ll be able to see up
the Skoonka Creek valley until
our view is blocked by the next
mountain (the 5000 ft. shoulder of
Botanie Mtn.). As our view swings
to the north, the south shoulder of
Arthur Seat blocks our vision at
least down to the 4000 ft. level.
Arthur Seat is over 5000 ft. high so
we are not going to see anything
behind except mountain peaks in
the distance.
Figure A-3: BRIDGE A.R.S. Mobile Coverage Map
If it was not for the broad northern shoulder on our unnamed mountain that we are naming BRIDGE
ARS, we would see right into the town of Spences Bridge, but it does lie in shadow. When drawing the
area close to the repeater site (2 or 3 km) you may want to inspect the 1:50,000 map of the site for more
detail, although small “lumps” in that area can usually be ignored. We have arbitrarily placed right and
left hand edges of this shadow at the 3000 ft. level. Note that the outermost (from the site) line more or
less follows the 3000 ft. level but bulges further away at the angle which matches the higher foreground.
Again arbitrarily, the outer coverage line follows the apparent gap up Murray Creek, stopping at the
5000 ft. level between Murray and East Murray Creeks. Our line then follows the height of land at the
head of Teit Creek to the eastern shoulder at the 4000 ft. level, thence north to Nicoelton Mountain
where it is again blocked to the 3000 ft. level. The thin strip of shadow shown on Tweal Creek is one
of those you could safely leave out as it is quite close to our site and one of those small “lumps” is the
cause. The larger shadow discussed previously is worthwhile including as its width indicates there is
an area where signals may be non-existent. Note that the closer the contour lines are to each other, the
steeper is the terrain. With a little practice you will be able to draw such a mobile coverage map that is
quite accurate.
- 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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