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<blockquote data-quote="bubby-joe" data-source="post: 576418" data-attributes="member: 307458"><p>Close, difference between an LNB and an LNBF is how there polarity is switched, an LNB is single polarity and requires some form of servo motor or extra device to switch from vertical to horizontal and an LNBF usually has built in switching by line voltage, 10-13 volt for vertical and 14-18 volt for horizontal in the coaxial cable from the receiver but in the end they both do the same job they convert TP frequency to something you either see or hear.&nbsp; The QPF-031 does both linear and circular KU basically 2 LNBF's in one and has dual polarity voltage switching making it 2 LNBF's and the ADF-120 is what it uses to properly concentrate signal on a prime focus dish.&nbsp; This married to a C-band LNBF in a dual scale ring on a motorized prime focus dish gives me the world with only 2 LNBF's and 1 4X1 DiSEqC switch, FTA receiver and a V-Box.&nbsp; I suppose I could cut up 2 C-band scale rings and have them welded back together after playing with the angles.&nbsp; If one's not available in North America then that's my last option build it from the scrap pile.&nbsp; I plan to hold the ADF-120 in the scale ring with a machined hockey puck, or a rear mounted 40 mm collar clamp, hockey puck very similar to what I use to hold a 40 mm throat LNBF in a 39 inch starchoice dish instead of there stacked LNBF.&nbsp; Same as my gun sight laser is mounted to center the scale ring on the dish only 40 mm mount hole.</p></blockquote><p></p>

[QUOTE="bubby-joe, post: 576418, member: 307458"] Close, difference between an LNB and an LNBF is how there polarity is switched, an LNB is single polarity and requires some form of servo motor or extra device to switch from vertical to horizontal and an LNBF usually has built in switching by line voltage, 10-13 volt for vertical and 14-18 volt for horizontal in the coaxial cable from the receiver but in the end they both do the same job they convert TP frequency to something you either see or hear. The QPF-031 does both linear and circular KU basically 2 LNBF's in one and has dual polarity voltage switching making it 2 LNBF's and the ADF-120 is what it uses to properly concentrate signal on a prime focus dish. This married to a C-band LNBF in a dual scale ring on a motorized prime focus dish gives me the world with only 2 LNBF's and 1 4X1 DiSEqC switch, FTA receiver and a V-Box. I suppose I could cut up 2 C-band scale rings and have them welded back together after playing with the angles. If one's not available in North America then that's my last option build it from the scrap pile. I plan to hold the ADF-120 in the scale ring with a machined hockey puck, or a rear mounted 40 mm collar clamp, hockey puck very similar to what I use to hold a 40 mm throat LNBF in a 39 inch starchoice dish instead of there stacked LNBF. Same as my gun sight laser is mounted to center the scale ring on the dish only 40 mm mount hole. [/QUOTE]

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