For years now the Dish 500+/1000+ LNBFs simultaneously receive two adjacent bands at 11.7-12.2 GHz and 12.2-12.7 GHz from approximately the same orbital slot without mutual interference.
I don't know what Dish does, "but" if their LO was 10.7 GHz, the output would be between 1 and 2 GHz.
Well AFAIK the Dish 500+/1000+ use perhaps four L.O.s;
Due to their frequency stacking approach, two (10.75 and 11.25 GHz) using low side conversion for the lower blocks (950-1450 MHz) of the two received bands, and the remaining two (13.850 and 14.350 GHz) to form the upper frequency blocks (1650-2150 MHz), using high side conversion.
But that's beside the point which I was trying to make which was to simply show that two close satellite bands can be successfully received, with each having sufficient out of band rejection of the other to prevent mutual interference, and I see nothing to prevent the same for separating the 17.3-17.7 GHz RDBS band from 18.3-20.2 GHz Ka bands.
... I don't see this being any different than DirecTV 8 & DirecTV 4S at 101 that makeup the TPs.
D8, D9S, and D4S, all operate within the same 12.2-12.7 GHz band and are separated into odd and even transponder sets with high isolation by being of both offset frequencies and opposite polarities.
The two adjacent bands received by the Dish 500+/1000+ both use the same odd/even polarity and therefore separation can only be accomplished through their being in different frequency ranges.
Edited by HoTat2, 15 July 2013 - 02:36 PM.