Codan-radio Radio Repeater Systems Training Guide Uživatelský manuál stáhnout pdf (Strana 61)

RADIO REPEATER SYSTEM | TRAINING GUIDE

Appendix E: Mobile Coverage Tests Page 53

Use the graph shown in Figure E-3.

Figure E-3: Mobile Power Output vs. Attenuation

There should be coverage from the proposed site to any location that has a resulting positive ﬁ gure.

Another method is to take the ‘Remaining Signal (dB)’ values from the Coverage test sheet and using

the Path calculation sheet (from Appendix D) as a guide, enter your “knowns” (e.g. mobile power output,

antenna gains, and cable and ﬁ tting losses) from your testing equipment and calculate the path loss

from the site to each mobile test point. Recalculating with ﬁ gures based on your planned equipment will

result in signal levels expected at each test point location.

The best method of measuring mobile coverage is to use radios that have been modiﬁ ed (metered at a

limiter stage of the receiver) and calibrated to measure signal levels. The test would be run in the same

manner as discussed above.

MOBILE POWER

OUTPUT (W)

ATTENUATION (dB) NECESSARY TO

REDUCE LEVEL TO 1 WATT

0 3 6 9 12 15

dB = 10 log P2/P1 or

10 log MOBILE PWR / 1W

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 87 88

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Codan-radio Radio Repeater Systems Training Guide Uživatelský manuál Strana 61