[mythtv-users] announce: script for locating QAM channels

Jeremy McDermond mcdermj at xenotropic.com
Sun Mar 5 15:40:20 UTC 2006

On Mar 5, 2006, at 5:32 AM, Brian Wood wrote:

> I'm a firm believer in using high-quality power supplies. A lot of
> problems can be traced to cheap ones (especially the ones in the $50
> cases with PS included). The PS is usually the first place a builder
> will skimp in order to save $$$.
> As I mentioned previously, I've had this problem with two different
> machines, the first had a Thermaltake 560-watt PSU, and the second
> was a stock Dell machine, not great, but probably a serviceable PSU.
> Good thought though. I wonder how much power capture cards in general
> draw. When MythTV systems start to get 3 or 4 of them how much power
> are we talking about ?
> I wonder if a lot of the strange, intermittent and unrepeatable
> problems we see reported here might be related to power problems.

I'm not sure if it's necessarily having enough power, but having  
clean power.  Having interference from a poorly shielded power  
supply, or having dirty power being provided to the card could wreck  
some serious havoc with the RF side of the card.

> So it sounds like the reported BER is meaningless ??
> I'll try connecting my card further upstream to see if this makes a
> difference. I had been assuming that a zero BER meant I had
> sufficient signal

According to http://www.penlug.org/twiki/bin/view/Main/ 
DigitalTelevisionDVB, the BER is meaningless on an HD-3000 card:

Note that neither the pcHDTV HD-2000 nor the HD-3000 card support the  
FE_READ_BER ioctl, so the ber reported by azap is undefined. It's  
usually 00000000 for the HD-3000 card, and something like FFFFFFF3  
for the HD-2000 card.

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