What is a Monoblock LNB used for?
A Monoblock LNB houses two (or more) LNBs in a single unit with a built-in DiSEqC switch, so one dish can receive two closely spaced satellites without any external switch or motor. It is designed for satellite pairs separated by a small orbital angle-commonly 3 degrees, 4.3 degrees, or 6 degrees-such as popular DTH satellite combinations. The receiver switches between the two satellites using a simple DiSEqC command.
Because the two LNB feeds are fixed at the correct spacing on one body, a Monoblock removes the need to align two separate LNBs on a multi-feed bracket. This makes it a clean, low-cost way to add a second popular satellite to a single fixed dish.
The key constraint is orbital separation: a Monoblock is manufactured for a specific angular gap, so it only works well for the satellite pair it is spaced for. For satellites that are far apart, you instead use separate LNBs on a multi-feed dish or a motorized system. Monoblocks are available in single, twin, and quad output versions to feed one or multiple receivers.