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=== Dish 500 Single ===* 20" : 110°Dish 500 with two Dish pro single LNB's to receive signals from Echostar 7 (110) and from Echostar 6,8 (119).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.Dish Network uses a general type of LNB called a circular feed lnb. All of the following DBS providers use specific types of circular LNBs: Dish Network, ExpressVu, and Direc TV. With these circular LNBs not all are compatible across the DBS providers. ExpressVu and Dish Network are compatible. This term is in reference to LNB switching that is necessary for receivers connected to more than one LNB. Remember, to receive from more than one satellite, more than one LNB was needed. Dish 500 introduced a dual LNB system. The receiver needed a way to switch between one LNB and the other, depending on what satellite a particular channel resided on. The Dish 500 required a 2 in 1 out switch(SW21), and the 4 in 2 out (SW42) switch for the receiver to receive from two satellites (119 and 110). Then Dish Network came up with the legacy Twin 500 and the legacy Quad. This LNB's incorporated two LNB and internal switches, eliminated the need for external switches. The switching system had to be further improved to accommodate the connection of more than four total receivers. This improvement is the Dish Pro (DP) LNB. The Dish Pro (DP) LNB takes the odd and even transponders and brings them both to the receiver at the same time. The old voltage switching control of the legacy LNB polarity became obsolete. With the new system the signal could be split to multiple receivers. However, the new Dish Pro (DP) LNB consumes the use of a full 1000 MHz or 1 GHz of bandwidth. Coax cable which worked Ok for Legacy installations may not meet the needs of a DP installation. The Dish Pro LNB's are typically denoted by the letters DP or DPP on the side of the LNB. The Dish Pro (DP) LNBs basically convert all horizontal frequencies to vertical so the lnb handles only one polarity. This is easier to separate signal with DP splitter. If the Dish Network receiver is a legacy receiver, it will not work with the modern DP LNBs.Both Legacy LNB Dish 500 and Dish Pro 500 are designed to receive satellite transmissions from 119 and 110. Twin and Quad legacy LNBs will connect up to four receivers. They have the SW21 for each output. These LNBs are designed to work for old receivers for Bell ExpressVu & Dish network. For ExpressVu the satellites are Nimiq 91W & Nimiq 82W. The newer DP LNBs will not work with older receivers, as stated above. Newer receivers should have the letters DP right on the front or top to indicate compatibility with modern DP LNB dishes.=== LNB Types Explained ==='''Single LNB:''' This refers to an LNB designed to support only one satellite receiver. It cannot be split to support more than one receiver at a time. It may be pointed to a single satellite in space.'''Dual LNB:''' This refers to an LNB designed to support two satellite receivers, or more with the addition of a multiswitch.=== Switches and the DisEqC ===A dual has two coax connections. 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. When the receiver want to tune to a channel on the 110 satellite, a digital signal using the DisEqC format was sent down the coax to the switch. Another signal was sent to switch back to 119.Dish Network also came out with several additional switches for various applications. All the switches used the same DisEqC method. The SW-64 required an external power supply. The SW-64 was used to distribute signal from three satellites (usually 119, 110 and either 61.5 or 148) to as many as four receives. The 61.5 and 148 satellites are used for additional local channel channels, international programming and other niche market market programming.