Reading SatPointer's signal strength prediction map with confidence
SatPointer's prediction layer translates complex orbital geometry into a colour-coded visual that anyone in Australia can use to plan a satellite dish installation. The map combines the user's selected latitude and longitude with real-time satellite positions, beam footprints, and estimated EIRP values to show where a dish will receive a usable signal. For installers in places as far apart as Cairns and Perth, this kind of pre-flight check saves hours of trial and error on a roof.
The colour bands are not arbitrary decorations; they represent calculated signal margins that determine whether a given dish size will close the link. Understanding what each band means, and what factors can shift the prediction, turns the map from a pretty picture into a reliable planning tool.
Decoding the colour bands on the map
The map uses a graduated scale from cool to warm tones to indicate signal strength at the selected location. Greens and blues typically represent strong, locked signals with healthy margin, while yellows and oranges show marginal reception that may require a larger dish or a clearer line of sight. Reds and dark purples indicate zones where the satellite's beam does not reach with useful power, or where the elevation angle is too low to overcome terrestrial noise.
| Colour Band | Approx. EIRP (dBW) | Likely Dish Size | Practical Outcome |
|---|---|---|---|
| Deep green | 50+ | 60–80 cm | Solid lock on standard services |
| Light green | 45–49 | 80–90 cm | Reliable reception, minor rain fade risk |
| Yellow | 40–44 | 90–120 cm | Works in clear weather, fades in heavy rain |
| Orange | 35–39 | 120–180 cm | Requires careful alignment, large aperture |
| Red / purple | Below 35 | 180 cm+ or no service | Marginal or unavailable |
The values above are guidance rather than guarantees, because local terrain, building obstructions, and the specific transponder you target all influence the final result. A home in suburban Adelaide with a clear northern sightline will behave very differently from a coastal property near Cairns where tropical rain bands roll in most afternoons. When the map shows a yellow patch over your address, do not assume the satellite is unusable; it usually means a modest upgrade in dish size or a small adjustment in mounting position will pull the signal into the green. The SatPointer Network page documents how aggregated user reports correlate with these colour bands in different regions, which can refine the default assumptions built into the prediction engine.
How beam coverage overlays affect the reading
Each satellite on the map is represented by a translucent footprint showing where its signal is calculated to reach the ground. These footprints are derived from published beam contours and the underlying orbital slots science that determines how tightly a transponder's energy is focused. A wide regional beam will tint a larger area in pale green, while a high-gain spot beam concentrates power into a smaller zone, producing a sharper colour transition on the map.
Australian users will notice that beams covering the continent tend to favour the eastern seaboard, where population density justifies tighter focus. If you are planning an installation in Hobart or western Tasmania, the same satellite may show a noticeably weaker reading than it would for a customer in Sydney or Brisbane, even when both sites sit inside the nominal footprint. The map reflects this honestly rather than smoothing the difference away.
Mountains, valleys, and urban canyons introduce secondary attenuation that the contour data alone cannot capture. For a property tucked into the Adelaide Hills or behind a ridge near Katoomba, you may need to overlay a terrain layer or manually verify elevation angles before trusting the colour band.
Regional variations across the Australian market
The Australian continent spans more than 30 degrees of latitude, and that span translates into genuine differences in elevation angle, atmospheric path length, and rainfall statistics. Darwin sits almost directly under many geostationary satellites, giving it some of the highest look angles in the country and reducing the chance of terrestrial interference from distant transmitters. Perth, by contrast, sees lower elevation angles for the same birds, which lengthens the path through rain and increases fade margin requirements.
Operators choosing a satellite for a remote mining camp in the Pilbara or a roadhouse along the Stuart Highway will usually favour birds with stronger Australia-wide beams rather than spot beams aimed at Sydney or Melbourne. SatPointer's dish-size estimator draws on this distinction and tends to recommend larger apertures for sites west of the Great Dividing Range.
Coastal properties from the Gold Coast to Geelong face a different challenge: salt spray, high humidity, and the occasional tropical cyclone all push installers toward marine-grade mounting hardware. The prediction map will not warn you about corrosion, but it does help you confirm that even after weatherproofing compromises, such as a slightly recessed mount, the link budget remains comfortably in the green.
Factors that frequently shift the colour band across the country:
- Darwin's high elevation angles reduce terrestrial noise, yet tropical wet-season rain still drives seasonal fades
- Perth and the west coast see longer slant ranges through humid air, pushing borderline sites into yellow
- The Great Dividing Range shadows valleys from the east, often downgrading mountain properties by a band
- Hobart and Tasmania sit at the edge of many beams, frequently requiring larger dishes than mainland equivalents
- Remote sites in the Pilbara or along the Stuart Highway depend on wide regional beams rather than east-coast spot beams
Common misreadings and pitfalls
A frequent mistake is treating the map's colours as absolute rather than as a forecast for a standard installation. The prediction assumes an unobstructed line of sight, a properly aligned feed, and a clean LNB. Anything that compromises those assumptions, such as a tree that has grown since the satellite was last surveyed, a loose connector, or a misaligned skew, will degrade real-world performance well below the mapped value.
Another common pitfall is ignoring the elevation number that appears next to each satellite marker. An elevation of 5 degrees over Melbourne may technically be in the green, but a dish pointed that low will pick up terrestrial 5G noise from nearby towers and will struggle during summer thunderstorms. Installers along the Mornington Peninsula or in the Bayside suburbs often find that raising the mount by a metre to clear a roofline shifts the elevation just enough to clean up the signal.
Users also sometimes forget that the map updates as the satellite's position drifts within its station-keeping box. A prediction captured at 9 am may differ slightly from one captured at 9 pm, and for inclined-orbit satellites nearing end of life this difference can push a marginal site from yellow to orange overnight.
Practical workflow for planning an installation
A reliable workflow with the prediction map starts with entering the exact installation address rather than a rough suburb centre, because a few kilometres can shift the colour band on a tight spot beam. From there, run the prediction for at least two candidate satellites and compare the dish sizes each requires; sometimes a less familiar bird offers a much smaller dish for the same service.
Field checks then confirm what the map suggests:
- Sweep the proposed mount location with a compass and inclinometer to verify the azimuth and elevation match the predicted values
- Inspect the sightline with a camera or drone to flag trees, gables, or new neighbours' two-storey extensions that may have appeared since satellite surveys were published
- Measure existing terrestrial signal levels with a spectrum analyser to confirm they sit well below the satellite's threshold
- Re-run the prediction after any change in dish size or location to see how the colour band responds
- Document the chosen settings and the predicted margin so future maintenance visits have a baseline to compare against
The SatPointer widget can be embedded on a tradie's website or a community forum, allowing customers in regional Queensland or the Top End to self-check their address before booking a callout. This reduces wasted visits and helps installers prioritise sites where the prediction is clearly green rather than chasing marginal installs. If the map points to a red or orange zone, the practical answer is rarely to abandon the project. It usually means selecting a different satellite, upgrading the dish, or relocating the mount to a position with a clearer horizon. For Australian households on the fringe of a beam, a 1.2 metre dish paired with a quality LNB often rescues what a smaller antenna cannot.
Set your installation address, pick a satellite, and study the colour bands before climbing onto any roof. A few minutes with SatPointer's prediction map turns a guess-and-check job into a planned, professional installation.