combine HD sat with comcast cable feed question

[wease59]

I know in the old days of DTV you could combine dtv and OTA antenna through a sat. diplexor.I tried this with my new home setup with comcast cable and i could not get sat 99 at all.No signal.I remove the 2 diplxerors and conect direct and get signal at 99%
It was only 99 that would not come in .101 and all others were perfect?
Any ideas on hold to get this to work as the home was pre-wired.
Thanks for any help.

 

[jdspencer]

Because of the Ka band now on DirecTV, you can't diplex cable with satellite.
The frequencies used overlaap.

 

[Brisak]

Actually there is a way,as long as you install the b-band converter before you diplex the satellite signal .

Actually attach the b-band converter to the
Diplexer that you are running from the dish
On the sat in port.

 

[DAS]

If you have an H/HR 23 or higher this will not work since the b-band in built into the ird.

 

[Brisak]

True but he has a 21 so he's all good

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[wease59]

Yes it work.
thanks