Installation guide
Determining Range and Clearance Tsunami MP.11 Antenna Installation Guide
Calculations
34
In the USA and Canada, this model radio can be installed with any gain directional antennas, as there is no Effective
Isotropic Radiated Power (EIRP) limit for the application of these systems for fixed point-to-point applications in the 5.8
GHz frequency band. In other bands and in other countries, EIRP limits may apply.
In the case of EIRP limits, use the lesser of either (P
out
- L
1
+ G
1
) or the EIRP limit within the previous equation. You
should check this calculation in both directions to assure legal application. 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.
Proxim’s recommendation is to keep at least 60-70% of the first Fresnel 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.
Tables for output levels can be found in the “Technical Specifications” appendix in your radio’s Installation and
Management manual.
Table 4-1 Examples of Minimum Antenna Cable Loss
* Note that higher data rates use lower output power, so less cable loss is required to meet the maximum EIRP limit.
Frequency Band Antenna
Gain
TPC
Setting
Minimum Cable Loss for
Data up to 24 Mbps*
EIRP Deployment
5.25-5.35 GHz
5.25-5.35 GHz
5.25-5.35 GHz
5.25-5.35 GHz
5.725-5.85 GHz
5.725-5.85 GHz
5.725-5.85 GHz
5.725-5.85 GHz
10
17
23
31
10
17
23
31
0
-6
-10
-10
0
0
-6
-10
0
0
1.5
9.5
0
0
0
3.5
28.5
29.5
30
30
28.5
35.5
35.5
36
USA
USA
USA
USA
USA, PtMP
USA, PtMP
USA, PtMP
USA, PtMP
5.725-5.85 GHz
5.725-5.85 GHz
5.725-5.85 GHz
5.725-5.85 GHz
5.47-5.725 GHz
5.47-5.725 GHz
5.47-5.725 GHz
5.47-5.725 GHz
10
17
23
31
10
17
23
31
0
0
0
0
0
-6
-10
-10
0
0
0
0
0
0
1.5
9.5
28.5
35.5
41.5
49.5
28.5
29.5
30
30
USA, PtP
USA, PtP
USA, PtP
USA, PtP
ETSI
ETSI
ETSI
ETSI