Plan a Dual-LNB Satellite Dish With SatPointer
Receiving two satellites from one dish can give an Australian home access to a broader selection of television, radio, data, or occasional satellite services without installing a second reflector. The arrangement uses two low-noise block converters, or LNBs, mounted on one bracket so each points towards a different orbital position while the dish reflects both signals into the feed assembly.
The difficult part is choosing compatible satellites and setting the offset between the LNBs accurately. SatPointer helps by combining your installation location with orbital data, mapping the required azimuth and elevation, and providing beam and dish-size information. Used before climbing onto a roof, it can turn a trial-and-error installation into a measured setup.
Choose A Suitable Satellite Pair
Start by identifying two satellites that carry services you are legally able to receive and that have usable coverage at your location. A satellite may appear over Australia but still have a weak or unsuitable beam in parts of the country. Compare the footprint, frequency band, polarisation, and estimated reflector size before buying hardware.
The separation between orbital positions is an important factor. Two satellites close together in the sky are generally easier to receive with one dish because the LNBs need only a small sideways offset. Wider separation may require a larger reflector, a specialised bracket, or a compromise in signal quality. The separation in degrees along the equator is not the same as the visible angle from your backyard, so use calculated pointing data rather than estimating from the orbital numbers alone.
A pair that works in Darwin may need a different approach in Melbourne or Perth. Brisbane and Sydney also produce different look angles, and the local horizon can be blocked by neighbouring roofs, trees, or hills. Check both satellites from the actual proposed mounting point, not simply from a suburb or postcode.
Use SatPointer Before Buying Hardware
Enter your installation location in SatPointer and select each satellite separately. Record the azimuth, elevation, and LNB polarisation or skew for both positions. SatPointer’s map makes it easier to see whether the dish will face a clear part of the sky and whether a nearby structure is likely to obstruct the lower-elevation signal.
The central satellite should normally be the stronger or more important service. Mount the dish so that this satellite sits at the main focal point, then place the second LNB to one side according to the satellite’s position in the sky. The bracket’s left-right direction can be counterintuitive: when standing behind the dish and looking towards the sky, the LNB offset may appear opposite to the satellite’s east-west movement on a map.
Use the SatPointer satellite database to review available orbital entries, beam coverage, and estimated dish sizes. Treat those figures as planning guidance rather than a guarantee. Rain fade, cable loss, local interference, and the quality of the LNB can change the result.
Calculate LNB Offset And Skew
A dual-LNB bracket does not place both converters at the exact centre of the dish. One LNB is at the focal point, while the second sits at a calculated offset. The reflector then illuminates the secondary LNB from a slightly different direction. A universal bracket with fine adjustment is preferable to a rigid holder because small changes can make a substantial difference to signal margin.
SatPointer gives the individual direction to each satellite, but the physical bracket setting still needs careful interpretation. The angular difference in azimuth and elevation indicates how far apart the satellites appear, while the dish’s focal length, diameter, and bracket geometry determine the actual spacing between LNB throats. A satellite installer may use a conversion chart supplied with the bracket, while an experienced hobbyist can begin with the calculated direction and refine it using a meter.
Skew is equally important. Rotate each LNB in its holder so its probe matches the satellite’s polarisation angle at your location. The correct rotation depends on latitude, longitude, and the satellite’s position. Mark the starting position with a pencil, then adjust in small increments while watching quality rather than relying only on raw signal strength.
Match The Dish And Mount To Local Conditions
A dish that is large enough for clear-sky reception may still be undersized for reliable rain performance. Select a reflector based on the weaker of the two services, especially if one beam is marginal in your region. Extra margin is valuable during summer storms, when heavy rain can reduce Ku-band signal levels quickly.
The mount needs to remain stable while both LNBs are aligned. A small movement at the dish edge can cause a noticeable change at the feed, so avoid a flexible balcony rail or a light TV antenna mast. On a tiled or metal roof, use suitable brackets, weatherproof penetrations, and corrosion-resistant fasteners. In coastal areas such as Newcastle, the Gold Coast, or Perth, salt air makes rust protection particularly important.
For exposed properties in northern Queensland, the Northern Territory, or Western Australia, wind loading deserves serious attention. A wind-load guide can help estimate the forces acting on the reflector and support structure. Check local building requirements and use a qualified installer where cyclone-rated work or roof access is involved.
Install And Fine-Tune The Two Feeds
Set the mast perfectly vertical before aligning the dish. An out-of-plumb mast can make the elevation scale inaccurate and can cause the dish to describe an unintended arc when adjusted. Tighten the mount enough to hold position while still allowing controlled azimuth and elevation movement.
Align the primary LNB and satellite first. Peak the signal using quality or carrier-to-noise readings, not just the receiver’s percentage indicator. Make tiny azimuth and elevation changes, pausing after each movement so the meter can respond. Then fit the second LNB and slide it along the bracket until its satellite reaches the best quality reading.
Connect the feeds to a DiSEqC switch if one receiver will select between both satellites. Label the ports clearly, for example, Satellite A on port 1 and Satellite B on port 2, then assign the same port numbers in the receiver menu. Use good compression connectors, minimise unnecessary joins, and seal outdoor connections against moisture. A short, high-quality coaxial run is usually preferable to a long cable with several adapters.
Confirm Reception Across The Whole Setup
Test multiple transponders on both satellites rather than stopping after one successful channel. Check horizontal and vertical, or left-hand and right-hand circular, services where applicable. A feed can appear aligned while one polarisation is weak because of incorrect skew, a damaged connector, or interference from a nearby transmission.
Record the final LNB order, skew marks, receiver settings, and signal readings. This makes troubleshooting easier after a storm or when a receiver is replaced. If a service disappears, first check whether its transponder, encryption, beam assignment, or broadcast schedule has changed before moving the dish.
Satellite enthusiasts often compare current listings and receiver configuration information with a satellite equipment resource, but verify technical details against the broadcaster and satellite operator. Channel availability can change, and an advertised footprint does not promise reception at every Australian address.
Practical Setup Recommendations
Keep the installation simple and measurable by following these priorities:
- Select the stronger or more important satellite as the dish’s central focal position.
- Confirm both footprints and calculated look angles at the exact property location.
- Use an adjustable dual-LNB bracket rather than forcing a generic monoblock into an unsuitable spacing.
- Align with signal quality readings and test several transponders on both satellites.
- Allow extra dish size and stronger mounting for wet, windy, coastal, or cyclone-prone locations.
- Label DiSEqC ports, cables, LNBs, and receiver settings before final weatherproofing.
A dual-LNB system is worthwhile when the two satellites have compatible coverage and enough angular separation for the selected reflector and bracket. It is less suitable when the satellites are widely separated, one requires a substantially larger dish, or the property has an obstructed view. In those cases, two dishes may provide a cleaner and more dependable result.
Open SatPointer, enter the proposed Australian installation site, and compare the two satellite positions before purchasing the dish, LNBs, bracket, switch, or cable. Use the calculated directions as your installation reference, then fine-tune both feeds on site for the strongest practical signal margin.