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38 lines
1.2 KiB
Markdown
38 lines
1.2 KiB
Markdown
# Coverage
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## Predicted coverage
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Meshview can display a predicted coverage boundary for a node. This is a **model**
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estimate, not a guarantee of real-world performance.
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### How it works
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The coverage boundary is computed using the Longley-Rice / ITM **area mode**
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propagation model. Area mode estimates average path loss over generic terrain
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and does not use a terrain profile. This means it captures general distance
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effects, but **does not** account for terrain shadows, buildings, or foliage.
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### What you are seeing
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The UI draws a **perimeter** (not a heatmap) that represents the furthest
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distance where predicted signal strength is above a threshold (default
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`-120 dBm`). The model is run radially from the node in multiple directions,
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and the last point above the threshold forms the outline.
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### Key parameters
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- **Frequency**: default `907 MHz`
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- **Transmit power**: default `20 dBm`
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- **Antenna heights**: default `5 m` (TX) and `1.5 m` (RX)
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- **Reliability**: default `0.5` (median)
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- **Terrain irregularity**: default `90 m` (average terrain)
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### Limitations
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- No terrain or building data is used (area mode only).
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- Results are sensitive to power, height, and threshold.
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- Environmental factors can cause large real-world deviations.
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