Aligning a dish for Eutelsat 10B at 10 degrees East
For installers and enthusiasts across Australia, locking onto a geostationary satellite requires more than guesswork and a hopeful nudge on the mounting bracket. The 10.0°E orbital slot is occupied by Eutelsat 10B, a multi-mission platform that carries Ku-band and C-band payloads serving maritime, governmental, and broadcasting customers across Africa, Europe, the Middle East, and parts of Asia. Catching its footprint from the Southern Hemisphere involves careful arithmetic, a clear line of sight, and an understanding of how Australia sits relative to the geostationary arc.
Eutelsat 10B replaced the older Eutelsat 10A spacecraft in 2022 and continues to provide coverage over the Indian Ocean region, which is highly relevant for vessels transiting west of Perth and for outback operations requiring connectivity to African or European hubs. Whether you are servicing a mining camp near Kalgoorlie, a remote homestead in the Pilbara, or a yacht club berth in Fremantle, the process of aiming your dish begins with knowing exactly where 10.0°E sits in the sky above your specific address.
Understanding the 10.0°E slot and Eutelsat 10B mission
The 10.0°E position has historically hosted satellites supporting African broadcasting, in-flight connectivity, and maritime services. Eutelsat 10B carries two main payloads: a high-throughput Ku-band beam covering the Atlantic corridor and Africa, and a wide C-band beam designed for global maritime and government users. The satellite is a Spacebus Neo platform built by Thales Alenia Space and was launched aboard an Ariane 5 rocket from Kourou.
From Australia, reception is challenging but workable, particularly for C-band signals in the western and northern parts of the continent where the look angle is more favourable. The satellite is visible above the horizon from most Australian latitudes, but the elevation angle is low, generally between 5° and 15° depending on your location. This means terrain, vegetation, and buildings can easily obstruct the signal path, so a careful site survey is essential before any bracket is bolted to a wall.
Site survey and location considerations for Australian installers
A successful installation begins long before the dish leaves the vehicle. Across Australia, installers face unique obstacles: salt spray on coastal installations between Sydney and Brisbane, cyclone-rated mounting requirements in northern Queensland, and bushfire risks that demand metal rather than plastic mounting hardware in rural Victoria. The first rule of thumb is to find the clearest possible horizon toward the north-northwest from southern Australian sites, or toward the west-northwest from northern sites.
In Melbourne, a rooftop with a view toward the north across the suburbs may work, but street trees planted for summer shade often block the low-elevation signal path. In Perth, the coastal plain offers good horizons in most directions, yet the Darling Scarp to the east can shadow installations in the foothills. For Adelaide installers, the Mount Lofty Ranges create similar challenges, and a site visit often reveals that the dish must go on the western side of the property rather than the obvious northern face. Brisbane sites typically enjoy clearer horizons thanks to the flatter terrain of the southeast Queensland coastal strip.
Elevation angles for 10.0°E from Australian capitals are surprisingly similar, ranging from roughly 8° in Hobart to about 13° in Darwin. At these low angles, even a single tree in the signal path can attenuate the signal by several decibels, so it pays to walk the property with a compass and mark the bearing on a site plan before drilling any holes.
Calculating azimuth, elevation and skew with SatPointer
Once you have identified a candidate mounting location, the next step is to calculate the precise pointing angles. Azimuth tells you which compass bearing to face the dish, elevation tells you how high above the horizon to tilt it, and polarisation skew tells you how many degrees to rotate the LNB within its clamp. All three values change with your latitude and longitude, so a tool that uses Google Maps as its base layer is invaluable.
The SatPointer application combines your selected installation address with current orbital data to produce the exact angles for any geostationary satellite. By entering your postcode or dropping a pin on the map, you receive a numerical readout and a visual line drawn from your location to the satellite. This removes the trial-and-error approach that used to dominate field installations, particularly for less common targets like 10.0°E where traditional pay-TV installers rarely point their dishes.
For a typical Sydney installation, azimuth comes out around 295° (roughly west-northwest) and elevation around 9°. From Perth, the azimuth swings to about 305° and the elevation drops slightly. These small numerical shifts matter at the margin, and getting them wrong by even five degrees can leave you chasing a signal peak that does not exist.
Selecting dish size and estimating required gain
Dish sizing for 10.0°E from Australia depends on which payload you are targeting and the strength of the downlink in your region. Ku-band reception is generally feasible with a 90 cm or 1.2 m dish in western and northern Australia, while eastern seaboard sites typically need a 1.8 m dish or larger to overcome the lower look angle and additional path loss. C-band reception demands substantially larger apertures, usually 2.4 m or more, because the longer wavelength offers less gain per square metre of dish surface.
If you are sizing a new dish, the how to estimate required dish gain using SatPointer data workflow walks through the calculation step by step, factoring in the EIRP footprint, free-space path loss, and your local noise floor. This is particularly useful when quoting a job for a remote client who cannot afford a return visit if the chosen dish turns out to be undersized.
For a small bar in Broome wanting to receive an African news feed for expat patrons, a 1.2 m Ku-band dish is often sufficient. For a pastoral station in the Kimberley needing reliable C-band connectivity for operational telemetry, a 3.7 m mesh dish may be the only practical option. The Australian outback is full of these trade-offs, and matching the antenna to the application saves both money and frustration.
Practical alignment procedure from compass to fine-tuning
Begin by mounting the dish on a plumb, rigid structure. In cyclone-prone areas of Western Australia and the Northern Territory, this often means a galvanised pole set in concrete rather than a wall bracket, since wall mounts can flex under wind loading and slowly drift off-target. Use a magnetic compass to set the coarse azimuth, accounting for magnetic declination: in Perth this is roughly -1°, in Sydney about +12°, and in Darwin closer to +4°.
Set the coarse elevation using the inclinometer or the scale printed on the dish mount, then connect your satellite finder or spectrum analyser to the LNB. Slowly sweep the dish from east to west in small increments, watching for the signal to peak. Once you have a peak, tighten the azimuth bolts only enough to hold position, then fine-tune the elevation, and finally adjust the LNB skew for maximum signal quality on a transponder known to be active on Eutelsat 10B.
If you are part of a team, the person at the dish should call out small movements while the person at the receiver watches the signal meter. A common mistake is to over-tighten bolts before confirming the peak, which then forces you to loosen everything and start again. Patience pays more than torque when aligning a dish at low elevation angles, where each degree of movement shifts the beam footprint noticeably.
Troubleshooting common signal issues in the field
Even after a textbook alignment, signal problems can emerge days or weeks later. The most common culprit in Australian installations is water ingress into the LNB or feedhorn, especially during the wet season north of the Tropic of Capricorn. A few drops of moisture can attenuate a Ku-band signal by 3 dB or more, which is often the difference between a reliable link and endless dropouts. Sealing connectors with self-amalgamating tape and weatherproof boots is a small cost that prevents many return visits.
Wind-induced movement is another frequent issue, particularly on the exposed coastal plains near Geraldton or along the Bass Coast. If the signal drops out during gusty weather but recovers when the wind drops, the mount is likely undersized or the bolts have worked loose. Upgrading to heavier-gauge brackets or adding a second set of guy wires on larger dishes usually solves the problem.
Finally, check for new obstructions. A neighbour may have planted a row of lemon-scented gums that has grown into the signal path, or a new shed may have been erected on an adjacent block. Australian gardens grow quickly in the warmer months, and a path that was clear at installation can be obstructed within a year. Regular maintenance visits, ideally annual, keep commercial sites online and protect the reputation of the installer.
Comparing look angles across Australian cities
The following table summarises the calculated pointing angles for Eutelsat 10B at 10.0°E from several Australian population centres. Values are based on the geodetic coordinates of each city centre and are accurate to within a fraction of a degree.
| City | Latitude | Longitude | Azimuth (°) | Elevation (°) | Skew (°) |
|---|---|---|---|---|---|
| Perth | -31.95 | 115.86 | 305 | 11 | -19 |
| Darwin | -12.46 | 130.84 | 285 | 13 | -27 |
| Adelaide | -34.93 | 138.60 | 296 | 10 | -17 |
| Brisbane | -27.47 | 153.03 | 290 | 9 | -22 |
| Sydney | -33.87 | 151.21 | 295 | 9 | -18 |
| Melbourne | -37.81 | 144.96 | 294 | 9 | -16 |
| Hobart | -42.88 | 147.33 | 292 | 8 | -14 |
These angles shift slightly as you move within each metropolitan area, so always re-calculate using the exact installation address rather than relying on a city-wide average.
Field recommendations for reliable 10.0°E reception
- Confirm a clear line of sight to the bearing indicated by your pointing tool before mounting the dish.
- Use a magnetic compass corrected for local declination, and verify with a GPS-enabled device.
- Select dish size based on the weakest transponder you intend to receive, not the strongest.
- Seal all outdoor connectors with self-amalgamating tape and UV-stable boots.
- Allow at least 10 cm of clearance behind the dish for LNB adjustment without obstruction.
- Peak the signal on a known-active transponder, then re-check on a second transponder for consistency.
- Schedule an annual maintenance visit to inspect mounts, seals, and vegetation growth in the signal path.
If you are planning a new installation or upgrading an existing system aimed at 10.0°E, the SatPointer application gives you the angles, the satellite footprint, and the dish-size guidance in a single browser window. The underlying orbital data and beam coverage come directly from the satellite data source, so you can trust the figures you see on screen. Open SatPointer on a laptop or phone, drop a pin at your installation address, and you will have everything you need to walk into the field with confidence.