無料 · ネットワーク・IT インフラ
無線リンクバジェット計算機.
対向無線リンクの自由空間損失、受信レベル、フェードマージン、フレネルゾーンのクリアランス、地球の丸みを計算します。
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.
使い方: 無線リンクバジェット計算機
データを入力するかファイルを選び、設定を調整して結果を生成します。コピーやダウンロードの前に結果を確認してください。
制限と対応形式
入力内容はお使いの端末で処理されます。
英語の技術説明
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.