Monoblock LNBs for 19.2° east and 13° east have been widely available for several years (indeed, the DiSEqC switching system was originally designed for just this setup).
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In May 2010 the Astra 3B satellite was launched to the Astra 23.5° east position to release the Astra 1E and Astra 1G satellites previously in that position for use at other orbital positions.
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The two feedhorns are positioned at the correct spacing for reception from the two satellites required and the DiSEqC switching system is used to select between the signals from the two satellites with commands from the connected receiver.
duo | Safri Duo | The Dynamic Duo | Duo LNB | Secret Garden (duo) | Monoblock LNB | Jimmy & Wes: The Dynamic Duo | Antique (duo) | Duo Duo | Benevento/Russo Duo | PowerBook Duo | Nervo (duo) | LNB Pro A | Grammy Award for Best R&B Performance by a Duo or Group with Vocals | Free Beer (comedic musical duo) | Fame (duo) | duo (music) | Duo Crommelynck | Duo-Art | D'Unbelievables duo, Pat Shortt | Appleton (music duo) |
Astra 3A was launched to provide follow-on capacity to replace the DFS-Kopernikus 3 satellite and deliver additional capacity for the Benelux countries and central Europe, to create SES-Astra’s third major European satellite hotspot after Astra 19.2°E and Astra 28.2°E with access to channels at both positions using a single dish fitted with a monoblock Duo LNB.
In March 2007, a new type of monoblock, called the Duo LNB was introduced by CanalDigitaal in the Netherlands for the simultaneous reception of Astra 19.2°E/Astra 23.5°E with a spacing of just 4.3 degrees.