Arcadian Networks Inc. V390I Benutzerhandbuch

3 Installing the V390i 

30 

V290iA User Guide 

Prior to connecting the cables to the V390i, you should determine whether an 
attenuator is needed. An attenuator is required in cases of an excessive received signal 
level. 

The V390i received signal level range is between -87 to -49 dBm (-38 to 0 dBmV). The 
received signal level is determined largely by the distance between the Base Station 
and the CPE, but can also be influenced by environmental conditions such as antenna 
height, NLOS, etc. To avoid excessive received signal level at close distances, an 
attenuator should be added between the V390i and the antenna.  

1.  Use the simulated expected received signal level for the specific location. If the 

expected received signal level is above -49 dBm (0 dBmV), choose an attenuator 
value that will reduce the received signal level to be in the range -87 to -49 dBm  
(-38 to 0 dBmV). 

2.  If a simulated expected received signal level is not available, use the following table 

for choosing the initial attenuation value. The expected covered range is calculated 
to meet the proper received signal level at minimum and maximum path loss. 

Table 2: Expected Coverage Range vs. Attenuator Level 

0 

12.5 to 20 

6 

6.5 to 15 

10 

3.75 to 12.5 

20 

1.25 to 6 

30 

0.4 to 3 

; 

Note: Following initial installation, you can learn the V390i actual received signal level 

(refer to Verifying RF Connection with the Base Station on page 32). Generally, the 
initial attenuator setting covers the actual received range. You may need to update the 
attenuator value in order to match the actual received signal level to the proper range