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Tsunami MP.11a Antenna Installation Guide
An EIRP limit is the maximum RF energy that can be transmitted, as measured at the transmitting antenna,
and is usually determined by government regulations.
Table 2. Receiver Sensitivity and Minimum SNR for a Good Link
Normal Mode
(Mbps)
Receiver
Sensitivity
Minimum SNR for
a Good Link
Turbo Mode*
(Mbps)
Receiver
Sensitivity
Minimum SNR for
a Good Link
54 - 69 dBm 21 108 - 66 dBm 21
48 - 73 dBm 20 96 - 70 dBm 20
36 - 77 dBm 16 72 - 74 dBm 16
24 - 81 dBm 12 48 - 78 dBm 12
18 - 84 dBm 9 36 - 81 dBm 9
12 - 86 dBm 7 24 - 83 dBm 7
9 - 87 dBm 5 18 - 84 dBm 5
6 - 88 dBm 4 12 - 85 dBm 4
* allowed in FCC regulatory domain only
The first Fresnel zone size is a list; Proxim’s recommendation is to keep at least 60-70% of this zone free. If
the clearance is lower than this percentage, the link budget and achieved fade margin are affected.
Clearances more than 100% of the Fresnel zone can cause reflections that are 180 degrees out of phase
and can cancel out the signal. The Fresnel zone works in both the horizontal and vertical paths.
Table 3. Output Power Table for FCC
Frequency Band Channels 54 Mbps 48 Mbps 36 Mbps 6-24 Mbps
5.25 – 5.35 GHz 52, 56, 60 14.5 15.5 17.5* 18.5*
5.25 – 5.35 GHz 64 12.5 12.5 12.5 12.5
5.745 – 5.850 GHz 149, 153 13.5 15.5 17.5 18.5
5.745 – 5.850 GHz 157, 161 13.5 15.5 17.5 17.5
5.745 – 5.850 GHz 165 12.5 15.5 17.5 17.5
* 17.4dBm is the FCC certified peak output power of Tsunami MP.11a product at 5.25-5.35GHz band
** 20.8dBm is the FCC certified peak output power of Tsunami MP.11a product at 5.725-5.850 GHz band
These power levels are the levels at the antenna connector of the MP.11, so where the MP.11 has a higher
output power than certified, the TPC needs to be used to reduce the output power.
Chapter 2. Determining Range and Clearance 23
CPN 65756B Issue Date: August 2003