You may be right, but on the other hand that spec lists output IF frequencies, which the SWM LNB doesn't output on the wire, and isn't likely to use at all even internally. If it outputs stacked frequencies they'd have to be immediately unstacked, as the input to the analog SWM splits out each 500 MHz wide band separately and uses LOs to shift them all to the same/similar (unspecified) frequency range prior to input to the "selection" stage. i.e. 12 separate inputs to the selector, or up to 16 if it had BSS capability. This would not only add unnecessary complexity/cost, it conflicts with Directv's obvious desire to reduce the number of LOs used in a LNB as much as possible, as demonstrated by multiple patents describing ways to reduce their number. DROs are quite cheap, maybe they may wish to reduce their number as a source of noise? Perhaps VOS can comment to that?
There's another reason I suspect this could possibly be the case that I didn't mention. There's a Directv patent that details the KaKu legacy LNB, describing use of two LOs sharing among all the 99/101/103/110/119 inputs (not really fitting the "not obvious" criteria, it merely "splits" the output of each LO, but it is no secret our patent system is broken) This is highly likely to be the design of the KaKu LNB, since everything fits perfectly with what we know. There is no mention of BSS frequencies anywhere in there. It also shows only 2 LOs, a third would be required for BSS (the BSS frequencies are filtered out after applying the Ka LO, as required to avoid BSS frequencies overlapping with Ka lo)
There's a second patent from Entropic that describes using a single LO to take the satellite inputs from 99/101/103 and output each 500 MHz band on a separate output in the range between 250 and 900 MHz or so. This is what the input of a SWM would desire, and would be useless as a standalone LNB due to the unstacked output. It uses multiple stages dividing the LO output to accomplish this, and provides some examples. One such example uses BSS frequencies. This is more recently filed, so wouldn't be a description of the current SWM, but wouldn't be a DSWM LNB either as a DSWM wants inputs at near baseband frequency (~50 - 550 MHz) Regardless of how applicable it may be, it got me thinking about how the limitations that would apply to the current KaKu supporting BSS wouldn't apply to the current SWM LNB, which at least allows for the possibility, even though I couldn't find a "smoking gun".
The information on WNC's site looks like it was copied from the SL3 and SL5 information, or it would have specified the SWM output range instead of the stacked range. Besides, if the SWM LNB is capable of receiving BSS, the specs on that page are 100% accurate until the day Directv starts broadcasting BSS and updates receiver firmware/guide info to select channels from it
Like I said, just throwing the possibility out there, I don't have any evidence. It sure would be handy for Directv if they wanted to use BSS for something that wasn't a narrow market, as only a small percentage of the Slimlines out there would need to be touched, versus all of them if the SWM LNB doesn't support BSS.
Edited by slice1900, 16 December 2013 - 04:23 PM.