Yeah, since there is really no room in the current stack of three 500 MHz wide blocks separated by 200 MHz guard bands, the LNBFs connected to external SWiM units will either have to move the converted RDBS band outside the stack "electrically" by converting to a frequency somewhere above 2150 MHz. Or move it "physically" by re-tasking the flexports.
Going back to this discussion, I have a question. Is using 200 MHz for guard bands really necessary? If Directv did introduce a new LNB, would smaller guard bands be an option? I know it isn't the same thing, but there are some pretty small guard bands of only a few MHz between transponders.
I realize that even if you can shrink the guard bands you probably can't eliminate them entirely, but if were possible to do so, you'd get 200 MHz between 750 and 950, and another 200 MHz between 1450 and 1650. Hey, 400 MHz, exactly what is needed for RDBS!
Unless there is a dormant LO at 14.95 GHz to allow current LNBs to place RDBS at 2350 - 2750 MHz, it would seem a new LNB would be required to receive RDBS. At that point, maybe shrinking the guard bands is an option. Just as an illustration, let's say we use a 50 MHz guard band instead of 200 MHz, and widen the IF range by 75 MHz on either end. If I've done the math right, this solution requires only two LOs; one for Ku at 10.475 GHz (or 14.925 GHz) and one for Ka and RDBS at 18.975 GHz:
B band 175 - 675 MHz
A band 725 - 1225 MHz
RDBS 1275 - 1675 MHz
Ku 1725 - 2225 MHz
This might make it more likely upgrading would require only a new LNB to handle A band and RDBS from D14 @99W and RDBS from D15 @101W, because it is expanding the signal range by a very small amount. It would also leave higher frequencies free in case Directv wanted to add even more capacity down the road.