Using SatPointer to compare two adjacent orbital slots
Using SatPointer to compare the coverage of two adjacent orbital slots turns a broad satellite map into a site-specific decision. Two neighbouring geostationary satellites may appear to cover the same Australian city, yet their orbital positions, beam limits and required pointing angles can produce different installation outcomes.
SatPointer is a free, web-based application operated by TotalSat Limited. It combines Google Maps, satellite orbital data and a user-selected installation location to calculate pointing directions for reception, uplink, downlink and mobile satellite links. The chosen location therefore matters as much as the satellite name.
Coverage is only one part of a useful comparison. The estimated dish diameter, azimuth, elevation and possible obstructions also affect the result. A technically covered site can still be difficult to install on an apartment balcony, a terrace or beside a metal rooftop pole.
Begin with two neighbouring slots and the service each satellite is intended to carry. Record the installation address and connection type, compare the outputs consistently, and retain enough detail to repeat the calculation when an installer or service provider requests the pointing data.
Why orbital neighbours need separate checks
Geostationary satellites are commonly separated by only a few degrees of orbital longitude. Two slots that look almost identical on a national map can nevertheless produce different bearings from the same address, particularly when one satellite serves a regional or spot beam.
A small change in orbital position alters the calculated azimuth and elevation. That difference may matter for a fixed bracket, a polar mount or a dish that must clear a parapet. Moving a dish by even a modest angle can also introduce pointing error if the installer assumes the neighbouring slot is equivalent.
National footprints can conceal the practical distinction between a metropolitan location and a regional edge. Perth may see an eastern orbital slot at a lower elevation than Brisbane, so obstructions and usable signal margin need checking separately even when the two locations fall under the same coverage description.
Set up the Australian installation site
In Google Maps, select the actual address, then verify that the pin represents the final dish position. On a Sydney or Melbourne apartment, roof-level coordinates can differ from a ground-level estimate by enough to affect the calculated clearance. Record the selected coordinates before comparing the satellites.
Choose two adjacent orbital slots from the satellite database and record each satellite’s full name and operator. Adjacent positions do not guarantee equivalent programming, capacity or service areas. Confirm that each selected entry matches the link being evaluated rather than assuming that nearby slots are interchangeable.
Set the relevant reception, uplink, downlink or mobile mode before reading the pointing results. Clock settings do not change the geometry, but they matter when arranging an installation: Sydney and Melbourne use AEST or AEDT, while Perth uses AWST without daylight saving.
Compare beam coverage and dish size
Check the satellite identities and nominal positions against SatPointer’s orbital source data. That helps ensure the calculations refer to the intended spacecraft rather than an outdated entry or a similarly named satellite.
Recording both results in the same format exposes differences that separate lookups can hide.
| Measure | First adjacent satellite | Second adjacent satellite | Decision value |
|---|---|---|---|
| Orbital slot | Enter the exact slot from the database | Enter the neighbouring slot | Confirms which positions are being compared |
| Beam coverage | Mark coverage at the selected address | Mark coverage at the same address | Shows where the address falls relative to each footprint |
| Estimated dish size | Record the returned diameter | Record the returned diameter | Estimates the antenna size associated with each link |
| Pointing direction | Record azimuth and elevation | Record azimuth and elevation | Highlights the physical adjustment needed for each dish |
| Mounting requirement | Note polar alignment or skew if shown | Note the equivalent result | Reveals whether existing hardware can be reused |
| Connection type | Select reception, uplink, downlink or mobile | Select the matching link type | Keeps the comparison tied to the intended service |
Treat the dish-size figures as planning estimates rather than guaranteed performance. Actual reception also depends on the signal available at the address, feed-line loss, receiver sensitivity, interference and local requirements. A smaller estimate can still be the poorer choice if the beam edge or the mounting position makes operation marginal.
Match the satellite to the link
Australian subscription-TV users may recognise names such as Foxtel and Fetch, but those brands are not proof that nearby slots carry the same channels. Use the satellite database and provider information to match the service to the link. SatPointer calculates a direction; it does not confirm channel packages, subscription eligibility or a particular installer’s availability.
Reception and downlink are often straightforward starting points, while uplink performance and mobile equipment can impose different antenna requirements. For crews working around remote Australian mining operations or on coastal vessels, verify the footprint, authorised frequencies and equipment specifications before committing to a site.
Independent checks of satellite naming and service context are useful when two entries sit close together. The satellite service reference from DigiSNS can help confirm that the selected spacecraft and orbital listings match the intended operators. Resolve discrepancies with the provider rather than relying on a directory alone.
Share the pointing data
Installers, community groups and satellite enthusiasts can share a calculation without making every visitor an analyst. The custom dish widget can be added to a website, blog or forum using the code supplied by SatPointer.
Configure the displayed satellite and available location options so the embedded view answers a practical question. Since pointing results depend on coordinates, a public widget should not imply that one fixed direction works everywhere. An installer’s contact details and a clear location prompt can make the tool more useful to visitors.
For a professional brief, record the coordinates, satellite name, orbital slot, azimuth, elevation, skew or mount setting, estimated dish diameter and calculation date. A screenshot can support the notes, but a written record remains valuable when several sites must be compared or an installer returns with revised measurements.
Put the comparison into practice
Choose the link that combines usable coverage with equipment you can obtain, install and maintain. Check the proposed dish position against the calculated direction instead of relying on a compass photograph. Apartment balconies, metal poles and rooftop structures can change the outcome, while coastal exposure raises corrosion concerns for exposed fittings.
Before replacing saved calculations or changing equipment in bulk, keep an untouched copy. The broader data-safety lesson in this backup comparison guide is to preserve the original before batch edits. For a satellite project, retain a dated copy of both satellites’ results, including coordinates and dish estimates, so a later calculation does not erase a known-good setup.
Verify the bearing and elevation at the proposed dish position with a compass and inclinometer, and check that the unobstructed path matches the calculated view. Open SatPointer, enter the installation location, select the two neighbouring satellites and save the comparison. Use the results to shortlist the link, brief the installer and retain the pointing data for future maintenance.