Connect802 is a nationwide wireless data equipment reseller providing system design consulting, equipment configuration, and installation services. 
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An OnLine Path Loss and Link Budget Calculator
for Wireless Network Design Suitability Analysis 


Overview and Explanations

NOTE: Results may be subject to arithmetic rounding errors. This calculator is designed to provide results with a level of precision that is sufficient for use in wireless network design. Calculated values represent the arbitrary arithmetic results of standard path loss, Fresnel zone, earth curvature, and link budget formulas. Measurements made in the field may vary from those calculated here since manufacturing tolerances and measurement accuracy introduce variability. Attenuation in cable connectors may vary substantially from theoretical values if oxidation is present. While every effort has been made to assure the accuracy of the calculations, Connect802 makes no guarantee of the accuracy or suitability of this information. 

THE FOLLOWING EXPLANATIONS AND TECHNICAL NOTES
ARE PROVIDED TO HELP YOU MAKE THE BEST USE OF THE
CONNECT802 WIRELESS NETWORK PATH LINK BUDGET
AND ANTENNA CALCULATOR 
Frequency 
Application 
Wavelength (Meters) 
Wavelength (Feet) 
Number of Wavelengths
for 1foot
Penetration 
800 MHz 
Cell Phone Communication 
0.37 
1.25 
0.81 
2.4 GHz 
802.11b/g 
0.12 
0.41 
2.43 
5.8 GHz 
802.11a and WiMAX 
0.05 
0.17 
5.88 
45 GHz 
PointtoPoint Microwave 
0.007 
0.02 
45.66 
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dBLoss = 96.6 + 20 Log10 (distance in miles) + 20 Log10 (frequency in GHz)


Earth curvature and the
Visual LineofSight 


Diagram Depicting Various Antenna System Designer Values 


Cisco 
85 dBm 

Orinoco 
82 dBm 

Belkin 
78 dBm 

SMC 
89 dBm 

Compaq 
82 dBm 

ZyXEL 
85 dBm 

Netgear 
84 dBm 

Zcom 
83 dBm 

DLink 
84 dBm 

Demarc 
91 dBm 

 Surveyors often use K=6/3 and this results in what is commonly called the "Visual LineofSight"
Refer to the Refractive Index discussion (above) to understand how the curvature of the earth appears greater than the physical, geometric spherical representation that might be used to calculate lineofsight to the horizon based on a tangent line from a point at some height above the surface.


Connect802's projects in Malaysia required careful assessment of Rain Fade for microwave links through the dense rainforests. 

Calculator PullDown Option 
Examples of Terrain 
Generally flat terrain surface 
Open parklands (use Foliage Attenuation if the link must pass through trees), farm land, water, airports (across the runway environment), thick junglelike vegetation (where the link will pass over the consistentheight tree tops) 
Suburban area; buildings roughly the same height 
Housing developments, smaller town downtown area (generally rural communities), apartment complexes (when the link passes over the top of the complex), industrial parks (with similarheight warehouses and offices) ALSO gently rolling hills 
Urban area; buildings of different heights 
City downtown areas with many different building heights, large university campus environments (where the link passes over the campus) ALSO mountain areas with steep, undulating topography 
Ignore terrain roughness 
This option tells the calculator not to add any attenuation factor for terrain roughness 

2.4 GHz Yagi Antenna 




Grid Parabolic Antenna 

NOTE: Results may be subject to arithmetic rounding errors. This calculator is designed to provide results with a level of precision that is sufficient for use in wireless network design. Calculated values represent the arbitrary arithmetic results of standard path loss, Fresnel zone, earth curvature, and link budget formulas. Measurements made in the field may vary from those calculated here since manufacturing tolerances and measurement accuracy introduce variability. Attenuation in cable connectors may vary substantially from theoretical values if oxidation is present. While every effort has been made to assure the accuracy of the calculations, Connect802 makes no guarantee of the accuracy or suitability of this information. 




