Software Manual

ALFOplus 24GHz (North America) - Release 01.05.0x - MN.00395.E - 004 121
Typical Rx signal power level: -40dBm. It is the most important item to optimise the antenna alignment,
but in a situation of interference Rx level can be good, BER acceptable but S/N margin low. This means
that when Rx fields will decrease then BER will increase fast. The situation can be easily shown with SCT/
WebLCT software looking at Signal Quality level.
Into WebLCT Software select:
• Equipment menu
• Maintenance
• S/N Meas. card (see Fig.90
)
The S/N at nominal Rx level, read by means of WebLCT, must be 38dB @1024QAM (typical S/N: 39dB)
(see Fig.90
).
Fig.89 - WebLCT radio link status
Fig.90 - S/N measurement
-60 0 ±3
-70 -1.17 ±3
-80 -2.34 ±3
-90 -3.51 ±5
-100 -4.68 ±5
Formula RSSI=Offset + (Signal Output)/Slope
Slope (V/dB) 0.117
Offset (dBm) -60