Wireless Lan Calculationz
MilliWatts to dBm Power Conversion
dBm to MilliWattsPower Conversion
Watts to dBm Conversion
dBm to Watts Conversion
Operating System Margin
Effective Radiated Power (ERP) Station Transmit Calculator
Fresnel Zone Clearance Calculator
Parabolic Antenna Tilt
Free Space Loss
Inverse Position

NOTE: You need several hours of reading before using those...



Fresnel Zone Clearance Simple

Enter details and press calculate:
Distance (miles):  
Frequency (Mhz):   




The 1st Fresnel Zone is  
80% of the 1st Fresnel Zone is 
60% of the 1st Fresnel Zone is
MilliWatts to dBm Power Conversion

Enter Power of Card in MilliWatts : Total:


dBm to MilliWattsPower Conversion
Enter Power of Card in dBm : Total:


Watts to dBm:

dBm = (10Log10(Power Watts)) + 30

Enter power in Watts:
=dBm.
dBm to Watts:

Watts = 10((dBm - 30)/10)
MilliWatts = 10(dBm/10)

Enter power in dBm:
= Watts.
= MilliWatts.

Operating System Margin

Enter details and press calculate:

Frequency (MHz):   
Distance between sites (miles):   
Transmit Power (dBm):   
Transmit Cable Loss (dB):   
Transmit Antenna Gain (dB):   
Receive Antenna Gain (dB):   
Receive Cable Loss (dB):   
Receive Sensitivity (dBm):   


Free Space Loss is:    
Received signal is:    



Your Theoretical System Operating Margin is:

NOTE: Please be aware that these figures are based on a clear Fresnel zone. If the Fresnel zone is encroached then the operating margin may be reduced by as much as 10dB.


Effective Radiated Power (ERP) Station Transmit Calculator
Enter details and press calculate: 
Card Power (dBm):  
Cable length (ft): 
Antenna gain (dBd):
Cable type + Card - Cable - Conn. + Antenna Total:
LMR-600 -1db =
LMR-400 -1db =
RG-213 -1db =
RG-58 -1db =
NOTE: Connector insertion loss is generally 0.15dBm. Coax ratings are to manufacturer specification which we have found to be much higher than measured.
Parabolic Antenna Tilt in Degrees:

Tilt = 57.2957795[((hB - hR)/(5280*DistMi)) - (DistMi/7920)]
 

Enter height above sea level of the Base Antenna in feet: above sea level
Enter height above sea level of the Remote Antenna in feet: above sea level

Enter Distance in miles: and

Base downtilt is Degrees.


Free Space Loss (isotropic):

Free Space Loss (isotropic):FSL (isotropic) = 20Log10(Frequency in MHz) + 20Log10 (Distance in Miles) + 36.6

Enter Frequency in MHz: MHz
Enter Distance in miles: and

FSL(isotropic) = dB.


Inverse Position (Azimuth and Distance):

 Latitude A:

Deg. Min. Sec.  

 Longitude A:

Deg. Min. Sec.   

 Latitude B:

Deg. Min. Sec.   

 Longitude B:

Deg. Min. Sec.   

 

Azimuth from A to B: Degrees
Azimuth from B to A: Degrees

The Distance from A to B is Miles.
The Distance from A to B is Kilometers.