TXVRG Coverage

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Basemap

Hillshade (DEM-derived)

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FCC Part 90 sites (ULS)

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PSKReporter 6m live spots (FT8)

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Coverage overlay opacity 70%

Click map to set TX, then compute. Or pick a repeater and use its values.

TX latitude TX longitude

Or paste a Maidenhead grid

Lat/lon accepts decimal (33.0198), DMS (33°1'11.3"N or 33 1 11.3 N), or DDM (33°1.19'N).

TX height AGL (m) TX EIRP (dBm) RX height AGL (m) — 1.5 = HT, 2 = mobile, 10 = home, 30 = tower RX gain (dBi) Frequency (MHz) Max range (km) — 32 km = 20 mi FCC UHF coordination ring Grid size (auto, scales with compute budget — bigger grid = sharper terrain) Propagation model Time reliability (ITM only) Compute budget (auto-picks supersample for accuracy)

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Apply land-cover clutter loss at RX Use OSM building footprints as obstacles Use 1m / 1/3-arcsec hires DEM where available

Microsoft Buildings + A/B vs OSM is a planned ingester (parquet per US state) — not yet wired. Track in TODO.

Coverage diff (what-if)

Run two coverage computes (same TX, different parameters), then compare. Green = signal gained, red = signal lost. ±1 dB renders transparent.

Baseline (A) Comparison (B)

Signal (dBm)

≥ -75 (very strong)
-79.5
-84
-88.5
-93
-97.5
-102
-106.5
-111
-115.5
-120
< -120 (below threshold)

Uses the selected node's stored TX values + the RX / range / model settings from the Compute tab.

Combine method

Tick the boxes in the list to combine multiple sites' coverage. Best-server takes the strongest TX per pixel — correct for any system where radios switch between sites on different frequencies. Sum-power adds in linear power — only correct for true simulcast on the same frequency.

no AOI — coverage renders the full bbox

Add node

Name Callsign Type

Lat Lon

Maidenhead grid (optional) TX antenna height AGL (m)

TX freq (MHz) RX freq (MHz)

CTCSS (Hz) EIRP (dBm)

Antenna pattern (radiation shape). "omni" matches any vertical (folded dipole, collinear, stacked) — they're azimuthally identical. Use a Yagi or corner reflector for directional sites (P2P links, sectorized coverage).

Pattern Orientation (°, 0=N)

Down-tilt (°, positive = ground)

H-plane (azimuth)

E-plane (elevation)

Site-locked RX assumptions (used when computing coverage for this node — not pulled from the Compute tab):

RX height AGL (m) RX gain (dBi)

Color Notes

F2-layer ionospheric skip zone — geometric model. Shows where first-hop skywave lands for a given frequency and solar conditions. Valid for HF through 6m (1.8–54 MHz); 10m and 6m are the primary use cases here. 6m will show "above MUF" under normal F2 conditions — sporadic-E (the main 6m skip mode) is not yet modeled.

solar data not loaded

Solar Flux Index (F10.7)

TX latitude TX longitude

Click the map on the Compute tab to set TX, or enter manually.

Frequency (MHz)

Hour (UTC, 0–23) Month (1–12)

* Sporadic-E probability is statistical (month + time-of-day). Individual openings are unpredictable. For real-time Es: check DX cluster or PSKReporter.

Signal (dBm)