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=== Dish 500 Dual Single LNBs ====== Dish 500 Dual 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). 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.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 external 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. The dual came with either two single LNBs which was rare, or two dual LNB's, which were LNBs each having two connectors, totaling four connectors.