Appendix H: Link Budget Calculator
WinLink User and Installation Guide
Version 1.750
16-164
Description of Parameters
The parameters described in this section are indicated in Figure
16-2
.
Fade Margin (FM) the margin taken in consideration as part of the
parameters needed as spare for high availability. Min level accepted by
the LBC is 6dB.
EIRP Tx Power + Antenna Gain (*) – in some products they are limited
to a max value due to local regulation and type approval.
Example 1
10 x Log (Value in mW) = (Value in dBm)
1W is the maximum EIRP (Tx Power + Antenna Gain (*)) that is
allowed in 5.4 GHz ETSI products by ETSI regulation, (*) considering
cable loss.
Note: 3 dB = 2 x Power
1W = 1000 mW
Æ
10 x Log (1000) = 30 dBm
2W = 2000 mW
Æ
10 x Log (2000) =33 dBm
Max/ Min range (distance) WinLink sensitivity threshold in -60dB range
-30 dBm < RSS (sensitivity) <-90 dBm, in addition Propagation Delay
is also considered 3.3uS / 1 km (refer to Throughput vs Distance
guideline)
Example 2
RSS = Tx(power) + Ant(Tx) + Ant(Rx) – loss
loss = 32.5 + 20 Log (D) + 20 Log (f);
D – Distance in km, f – Center Frequency
Climate/Terrain Factor, see Figure
16-3 and Figure
16-4.
Expected FM and RSS, refer to A and B
Required Antenna Height, this is the required antenna height
considering the Fresnel Zone. Refer to WinLink site-survey guideline.
based on antenna beam
Considering LOS (clear
Line of Site
)
Channel Bandwidth is required with the available Radio Frame Pattern
(RFP) for collocated HSS systems.
