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Path Calculator

Click here for Link Planner: Approximation of Bearing and LOS Distance based on GPS co-ordinates

Click here for Link Planner: Radio Propagation Path Loss Calculator

Click here for Link Planner: Fresnel Zone & Earth Curvature

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Link Planner: Approximation of Bearing and LOS Distance based on GPS co-ordinates
Deg Min Sec Hemisphere Dec Deg
Site A Latitude
Site A Longitude
Site B Latitude
Site B Longitude
Distance (km) A to B
Distance (mi) A to B
Bearing A to B Bearing at A looking towards B
Bearing B to A Bearing at B looking towards A
Note 1: It is important to enter the hemisphere, ex: N, E, S, W.
Note 2: Enter co-ordinates in deg, min, sec and the hemisphere. The decimal degrees will be calculated, and the sign will reflect the hemisphere (North and West will be positive, South and East negative)

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Star Microwave - Radio Propagation Path Loss Calculator*
System Description
Site A Site B
Link Frequencies
Site Name
Data Input
Parameter Symbol Value Units Comments
System Parameters Antenna feed loss Af dB Outdoor Unit to Antenna Losses
Operating Frequency F MHz
Site A Antenna Gain Gt dBi Yagi
Transmitter Output Power Pt dBm Measured at Outdoor Unit output
Site B Antenna Gain Ar dBi
Receiver Sensitivity dBm For BER=1e-6
System Gain - Calculated
Link Parameters Link Distance (km) D km Line of sight distance
Distance (miles) - Calculated D miles LOS converted to miles
Link Availability Climate Factor Cf Average
Terrain Factor tf Mountainous
Calculated Output
Calculated Parameters Link Fade Margin dB
Link Path Loss Lp dB
Link Availability %
Link outage hrs/yr hrs/yr
Effective Radiated Power dBm
Received Signal Power Pr dBm

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Link Planner: Fresnel Zone & Earth Curvature
Path lenght(km) Fresnel zone factor
Tower 1 height(m) Frequency(Ghz)
Tower 2 height(m)
Tower to
on Earth
Earth Terrain
Note 1: Earth Curvature is based on spherical earth model approximation with radius of 6371km.
Note 2: Atmospheric refraction causes the wavefront to bend towards the higher density region,this is model with a typical K-factor of 1.33.
Note 3: A Fresnel zone factor of 0.6 with clearance is required for good line sight reception.