Codan-radio Radio Repeater Systems Training Guide Manuel d'utilisateur télécharger pdf (Page 47)

RADIO REPEATER SYSTEM | TRAINING GUIDE

Appendix B: Drawing Path Proﬁ les Page 39

APPENDIX B: DRAWING PATH PROFILES

In Appendix A, coverage maps were drawn for the BRIDGE Base Station (Ofﬁ ce) and BRIDGE A.R.S.

showing the expected coverage of those sites. To determine if the BRIDGE A.R.S. site will communicate

with the Base Station a path proﬁ le must be drawn. If any two sites (base station to repeater or repeater

to repeater) are to be linked together, a path proﬁ le between those two sites must be drawn.

On a 1:50,000 map covering the area between the two sites, draw a straight line between the two points

as shown in Figure B-1. Find the center and scale off from that point at 1 km intervals to each end.

Prepare the 4/3 earth curvature proﬁ le paper with names, date, and any other pertinent information as

shown in Figures B-2 and B-3.

From the 1:50,000 map which you have marked and again starting at the center, working your way

out to each end in turn, transfer the elevations from the map, one kilometer at a time. You may wish

to interpolate highs and lows between points as shown on the map. Although the example shows the

points marked in heights for each kilometer, you will ﬁ nd that marking is unnecessary after you have

done one or two proﬁ les. You can now see whether or not the path is line-of-sight. Once the path proﬁ le

has been drawn, path calculations need to be made for path loss characteristics and signal levels.

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Codan-radio Radio Repeater Systems Training Guide Manuel d'utilisateur Page 47