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=== Dish 500 Dual Dish Pro LNBs ====== Dish 500 Dual Single LNBs ===The first Dish 500 Dishes used two-single LNBs for a one receiver system. This Dish 500 with two Dish pro single LNB's will receive signals from Echostar 7 (110) and from Echostar 6,8 (119). To allow a receiver to get signal from both the 119 LNB and the 110 LNB. Dish network developed the SW-21 Switch. The SW-21 Switch is a digitally controlled A/B switch.The first Dish 500 Dishes used two-single LNBs for a one receiver system. This Dish 500 with two Dish pro single LNB's will receive signals from Echostar 7 (110) and from Echostar 6,8 (119). A Dish 500 Dual installation may use DP (Dish Pro) LNB types or two Legacy LNB types. Either allows a receiver to get signal from both the 119 LNB and the 110 LNB. Dish network developed the SW-21 Switch for combing the signal from the two separate LNBs. Note that even with the dual DP LNBs the SW-21 switch is still required. The SW-21 Switch is a digitally controlled A/B switch.=== Dish Pro 500 ====== Dish Legacy Twin 500 and Pro Twin 500 ===Made for Dish Network by Winegard with DishPro Plus Twin LNBF used to pickup the Echostar 110 and 119. LNB features a built-in DP21 videopath multiswitch compatible with all newer "DishPro" receivers. Older units equipped with they legacy twin LNB, newer equipped with DishPro Plus twin LNB.Made for Dish Network by Winegard with either Legacy Twin or DishPro Plus Twin LNB used to pickup the Echostar 110 and 119. The Pro Twin LNB features a built-in DP21 videopath multiswitch compatible with all newer "DishPro" receivers. Older units equipped with they legacy twin LNB, newer equipped with DishPro Plus twin LNB. Units may also be available with the old Legacy Quad, which still received from two satellites but allowed for a total of four receivers.