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OK, a few points of explanation.
When the next satellites are launched, DirecTV 10 and 11, they will use part of the frequency band overlapping OTA. This means that diplexing OTA onto the satellite cables will not work. IT DOES WORK TODAY but when DirecTV 10 and 11 start transmitting the diplexing will fail.
You can still use diplexing to get OTA to older receivers, anything that does not support Ku/Ka band (the MPEG-4 channels). Connect the four outputs from the AT-9 dish to the Zinwell WB-68 multiswitch. Take four outputs from the WB68 multiswitch and connect them to an old POWERED 5x8 multiswitch. Connect your OTA to the fifth input of the 5x8. You will now have four outputs left from the WB68, these will support Ku/Ka receivers (the R20 and HR20). The eight outputs from the old multiswitch will support older non-MPEG 4 receivers and will have OTA diplexed onto them.
It is possible that the old 5x8 multiswitch with built-in diplexing will not isolate the signals enough to eliminate interference with OTA. No-one really knows until the new satellites are up. If there is a problem you will have to insert diplexers in each of the cables between the WB68 and the old 5x8 to strip out the interfering signals.


There is also a possibility that by moving the b-band converters to the outputs of the WB68 instead of being connected to the receivers directly you will be able to diplex OTA. Again no-one can be sure until they've tried it, and that can't be done until the new satellites are on line.

It is likely that all new national HD will be in MPEG-4 and on the new satellites. No-one is sure how long there will be the current MPEG-2 HD channels, maybe for a long time.
 

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Claus - I don't see how anyone has actually tested putting the b-band converter at the WB68 since the new satellites have not yet been launched so there are no Ka-lo signals to convert. I haven't even seen anyone posting using test equipment to do this since it would probably be a very expensive test to set up. The only way to know will be to try it when we are getting Ka-lo signals from DirecTV 10 and 11.
 
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