Section 2 Microwave Path Engineering Basics | TRACER 4106/4206 System Manual |
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Table 3 lists path loss values for various path lengths for both 2.4 GHz and 5.8 GHz systems. Values not listed in the table can be interpolated from those listed.
Table 3. Path Loss for Given Path Lengths
Path Length | Path Loss (dB) | Path Loss (dB) |
(miles) | at 2.4GHz | at 5.8 GHz |
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1 | 104 | 112 |
2 | 110 | 118 |
3 | 114 | 121 |
4 | 116 | 124 |
5 | 118 | 126 |
10 | 124 | 132 |
15 | 128 | 135 |
20 | 130 | 138 |
25 | 132 | 140 |
30 | 134 | 141 |
35 | 135 | 143 |
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5.RECEIVER SENSITIVITY
Receiver sensitivity is a value expressed in decibels referenced to one milliwatt (dBm) that corresponds to the minimum amount of signal power needed at the receiver to achieve a given bit error rate (BER). Receiver sensitivity is usually a negative number of decibels and smaller receiver sensitivity (higher quantity negative number) is better for a given BER. Several factors affect receiver sensitivity including the data bandwidth of the wireless link, and the amount of additional signal degradation introduced in the receiver electronics.
Receiver sensitivity of the TRACER 4106/4206 is dynamic as a function of desired bandwidth; receiver sensitivity improves as delivered bandwidth decreases. In situations where 4xT1 connectivity is not required, the delivered bandwidth can be decreased to either 2xT1 or 1xT1, and the receiver sensitivity will be improved as follows:
Table 4. Receiver Sensitivity for the TRACER 4106/4206
Delivered | Receiver Sensitivity | Active | |
Bandwidth |
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TRACER 4106 | TRACER 4206 | ||
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4xT1 | A – D | ||
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2xT1 | A, B | ||
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1xT1 | A | ||
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Should an interferer be present nearby, three software selectable bandplans are provided for frequency agility. Changing the TRACER 4106/4206 bandplan does not require additional components, or opening of the radio. See TRACER System Option > RF Bandplan on page 47 for additional details.
20 | © 2004 ADTRAN, Inc. |
