The Twin LNBF is used with a DISH 500 dish antenna. It sees both 110° and 119° orbital locations and connects directly to up to two receivers.
The Twin LNBF has internal switches, and therefore cannot be used with other switches for connection to more than two receivers. The Twin LNBF can be connected to SW21 switches to allow you to receive signals from three orbital locations (e.g. 110°, 119° and 61.5°) when used in conjunction with a second dish antenna.
Here is an easy tip in determining if you have a Quad LNBF, without removing the LNBF from the dish. The Quad has a silver Dish logo sticker on the back. The Twin has an embossed Dish logo on the back.
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