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无线链路预算计算器.
计算点对点无线链路的自由空间路径损耗、接收电平、衰落余量、菲涅尔区净空和地球曲率影响。
CALCULATED IN YOUR BROWSER · NOTHING IS UPLOADED
Fade margin18.3 dBmeets the target
- Free-space path loss
- 121.7 dB
- EIRP
- 42.5 dBm
- Received signal
- -56.7 dBm
- First Fresnel zone radius (midpoint)
- 8.04 m
- Earth bulge at midpoint
- 0.37 m
- Clearance needed above obstacles at midpoint
- 5.19 m 60 % of the Fresnel zone + earth bulge
- Maximum distance for 15 dB margin
- 7.32 km
- Free-space model: FSPL = 20 log₁₀(d km) + 20 log₁₀(f MHz) + 32.44. Real links lose more to obstacles, multipath and, above about 10 GHz, rain.
- EIRP and frequency limits are set by national regulators and differ between countries; check that your power and antennas are legal where you install them.
使用方法: 无线链路预算计算器
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英语技术说明
Free-space model: obstacles, multipath and rain fade above 10 GHz need site-specific planning. Legal power limits vary by country. Everything is calculated in your browser; nothing is sent or probed on the network.
FSPL = 20 log₁₀(d) + 20 log₁₀(f MHz) + 32.44; received power = EIRP − FSPL + receive gain − losses. Clearance = 60 % of the first Fresnel zone + d² ÷ (8 k R).
A 5 km link at 5.8 GHz with 20 dBm and 23 dBi antennas receives −56.7 dBm: an 18.3 dB margin, with 5.2 m clearance needed at midpoint.