[mythtv-users] QAM64 vs. QAM256

Brad DerManouelian myth at dermanouelian.com
Sun Apr 22 15:21:36 UTC 2007

On Apr 22, 2007, at 11:13 AM, Geoff Mishkin wrote:

> I've been trying to get the digital part of my roommate's pcHDTV  
> HD-5500
> to cooperate for a couple of months now.  I have an HD-3000 which  
> works
> fine with QAM256, but with his, the signal strength would remain at 0
> when I try to scan QAM256.  I recently inadvertently scanned QAM64 and
> to my amazement, all the channels showed up!
> We are both connected to the same cable system, and are behind the  
> same
> splitter.  We are both on kernel 2.6.20.  I was wondering if someone
> could provide an explanation for the apparent two different  
> modulations
> on the same piece of wire.
>              --Geoff Mishkin <gmishkin at bu.edu>

I think I remember a bug in some newer kernels where the strength is  
not reported correctly and always displays as 0.

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