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Wireless Calculators

# Calcolatrice Wireless

### Sistema Wireless Power Budget
 Radio and Antenna Transmit Power Antenna Gain Power mWOR dBm dB(i) dB Cable Loss Cable Properties(per 100 ft or m) Cable Length dB (100 ft)OR dB (100 m) feetOR meters dB Connector Loss Frequency in MHz No. of Connectors MHz. No. dB Budget dB

Free Space Loss
 Frequency Distance Result MHz KmOR Miles dB

Fresnel Zones
 Total Link Obstacle Distance 1st Fresnel Zone Radius KmOR Miles KmOR Miles mat Km ftat Miles Frequency 60% No Obstacle Radius MHz m ft Earth Height (mid-point) m ft

System Performance
 Frequency Distance Result MHz KmOR  Miles dB TX Power TX Cable TX Antenna dBmOR mW dBm dB dB RX Sensitivity RX Cable RX Antenna dBm dB dB dB Margin RX Power SAD Factor Theoretical Margin dBm % dB

milliWatts to dBm (and vice versa)
 Transmit Power Result mW dBm Power Ratio Result dBm mW

# Power Budget Calculations

1. mW to dBm = 10Log10(Watts) + 30

2. feet to meters = .3048

3. meters to feet = 3.28

4. Calculator normalises all distances to kilometers and meters

5. Connectors loss = 0.10 * square root (frequency in GHz)

# Free Space Calculations

1. Free space loss = 36.56 + 20Log10(Frequency) + 20Log10(Distance in miles)

2. Calculator normalises all distances to miles

3. Miles to Kilometers = 1.609

4. Kilometers to miles = 0.621

# Fresnel Zone Calculations

1. Calculator normalises all distances to kilometers and meters

2. Miles to Kilometers = 1.609

3. Kilometers to miles = 0.621

4. feet to meters = .3048

5. meters to feet = 3.28

6. 1st Fresnel Zone radius (Km) = 17.3 x Sqr root ((Obstacle Distance x (Total Link - Obstacle Distance)) / (Frequency in GHz x Total Link))

7. 1st Fresnel Zone radius (miles) = 72.1 x Sqr root ((Obstacle Distance x (Total Link - Obstacle Distance)) / (Frequency in GHz x Total Link))

8. Obstacle free radius = 0.6 x 1st Fresnel Zone radius

9. Radius of nth Fresnel zone = sqr root ( (n x wave length x Obstacle distance x (Total Link - Obstacle Distance)) / Total Link )

10. Earth curvature calculation = Total Link **2 /8 * earth radius

11. Earth radius = 3963 miles, 6378 Km

# System Performance Calculations

1. Calculator normalises all distances to miles and feet during calculations.

2. Free space loss = 36.56 + 20Log10(Frequency) + 20Log10(Dist in miles)

3. mW to dBm = 10Log10(millWatts) + 30

4. dBm to mW = 10(dBm/10)

5. RX Power = Margin - RX sensitivity

6. Theoretical margin = TX power budget + RX power budget - free space loss

7. SAD factor = Theoretical margin/TX power budget * 100 and shows the percentage of spare power on transmission.

# dBm to Watts Calculations

1. mW to dBm = 10Log10(Watts) + 30

2. dBm to mW = 10(dBm/10)

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