Black Box LW0050A Manual page 49

CHAPTER 3: Using the Local Terminal for Unit Setup and Management
# Pack
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
7. The RSSI is given in arbitrary units. Use the following graph to correlate RSSI
to dBm.
8. Re-align the antennas until the maximum received signal strength is attained.
As you align the antennas, the RSSI (received signal strength indicator)
continually increases until it reaches a certain level, after which it begins to
decrease. That highest point is the maximum attainable RSSI level, indicating
optimum receive antenna alignment.
9. Switch the functions of either side of the link (set the transmit unit to receive
and the receive unit to transmit) and repeat the procedure to check the link
from the opposite direction.
Ant RSSI1 RSSI2
1 92
1 92
1 89
1 95
1 95
1 95
1 95
1 95
1 92
1 99
1 102
1 95
1 105
1 103
1 102
1 104
1 97
1 100
2 87
2 82
Figure 3-7. Receive Statistics.
130
120
110
100
90
80
70
60
50
–30 –40 –45 –50
Figure 3-8. RSSI to dBm Graph.
Bit_Err Freqs
84 0 76
82 0 75
89 0 58
92 0 51
89 0 46
81 0 10
90 0 31
51 0 4
85 0 5
90 0 77
89 0 43
89 0 22
86 0 58
89 0 51
89 0 46
69 0 64
87 0 78
87 0 33
85 0 71
85 0 70
RSSI vs. dBm
–55 –60 –65 –70 –75
RF Level [dBm]
Rate Quality
2 #########..
2 #########..
2 ########...
2 ##########.
2 ##########.
2 ##########.
2 ##########.
2 ##########.
2 #########..
2 ##########.
2 ###########
2 ##########.
2 ###########
2 ###########
2 ###########
2 ###########
2 ##########.
2 ###########
2 ########...
2 ########...
–78 –81 –83 –85
47