Calculations & ConversionsA Wireless System (more or less!)
System
Performance System PerformanceThis calculator will give you one of three answers:
To RESET any parameter just set it to BLANK before clicking 'Calculate' Notes: RX Sensitivity is ALWAYS expressed as a negative dBm ( dBm) and is the lowest power of signal your radio can handle. Its buried somewhere in your radio spec and will be typically in the range of 70 to 110 dBm. Don't guess or 'fudge' this number. Note: If you solve for TX antenna (you leave it blank) and define a specific SAD factor it is applied to the TX budget and any TX antenna value will include this factor. If you then click Calculate again without changing anything, the SAD factor will be calculated to include the supplied TX antenna value and thus may show a lower value than the original one. Calculations and equations used. System Performance Calculations
* NOTE: Calculations provided by Zytrax. Calculators are provided for the use of our customer’s at their own risk and RF Linx, Inc. does not ensure their accuracy or applicability. Power BudgetUse this calculator to walk through all the factors that make up your Power Budget. The 'Power Budget' is the the total power being output from the wireless system and is the sum of:
Enter one parameter in each column (or leave blank) depending on what you know and the calculator will supply the appropriate conversions automatically. Up to 2 decimal places may be entered as 0.xx or .xx. Note: Connector loss is generally small UNLESS you've got lots of 'em in which case you are probably in trouble anyway, or your cable is VERY short. Just leave the line blank if you are feeling lazy. Calculations and equations used. Power Budget Calculations
* NOTE: Calculations provided by Zytrax. Calculators are provided for the use of our customer’s at their own risk and RF Linx, Inc. does not ensure their accuracy or applicability.
Antenna
Height Fresnel ZonesDefines how much clearance you need (yes you need more than simple LineofSight) and for longer links > 3 Km (2 miles) whether you may have a ground clearance problem from our friendly planet. M. Fresnel and his theories. Enter the Total link distance (in Miles or Kilometers), if you do not enter an Obstacle distance (in Miles or Kilometers) the calculator will use the midpoint for all calculations (Note: assumes antennas at same height). Finally enter the system Frequency in MHz and then click the 'Calculate' button. 1 GHz = 1000 MHz e.g. 2400 = 2.4 GHz. The calculator will generate the radius of the 1st Fresnel zone only (at the obstable point or the midpoint), the 60% (no obstacle) radius and the height of the effective earth curvature at the midpoint of the Total link distance using the effective earth radius. Calculations and equations used. Fresnel Zone Calculations
* NOTE: Calculations provided by Zytrax. Calculators are provided for the use of our customer’s at their own risk and RF Linx, Inc. does not ensure their accuracy or applicability.
dB to Watt
Conversions dB to Watts ConversionsPower in milliWatts to dBm (and vice versa) . Enter the 'Transmit Power' (A or G above) in milliWatts OR the 'Power Ratio' in dBm and click the appropriate 'Calculate' button. 1 Watt = 1000 milliWatts. Calculations and equations used. dBm to Watts Calculations
* NOTE: Calculations provided by Zytrax. Calculators are provided for the use of our customer’s at their own risk and RF Linx, Inc. does not ensure their accuracy or applicability.
Channel
Information Channel Information & Overlap Guide
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(Top) United States Frequency Allocation Charthttp://www.ntia.doc.gov/osmhome/allochrt.html(Top)
FCC
Information Basic EIRP Worksheets for Amplified Systems
Note:
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Free Space
Loss Free Space LossLoss of power over distance (assuming no FRESNEL Effect and nothing in the way). This a very idealised calculation and in practice everything interferes with the signal but it will give you a reasonable approximation of the actual loss over distance. Enter the system Frequency in MHz and the distance in either Kilometers (Km) or Miles below and then click the 'Calculate' button. 1 GHz = 1000 MHz e.g. 2400 = 2.4 GHz. Calculations and equations used. Free Space Calculations
* NOTE: Calculations provided by Zytrax. Calculators are provided for the use of our customer’s at their own risk and RF Linx, Inc. does not ensure their accuracy or applicability.
Average
Loss Charts Average Loss Charts
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