[mythtv-users] Image Quality PVR-500

[Bill Chmura]

On Mon, 19 Feb 2007 10:17:56 -0700
Brian Wood <beww at beww.org> wrote:

> 
> On Feb 19, 2007, at 10:07 AM, John Drescher wrote:
> 
> >> Anyway, one thing to keep in mind is that the 500 has a splitter  
> >> inside it.  So when you are working out signal loss across all  
> >> your splitters and such, there is a two way in there.  No idea on  
> >> the quality of it though.
> >>
> > Actually the PVR500 has an amplifier (a really cheap one at that) in
> > it and that is the source of the problem. I wish it was a splitter as
> > that would be much easier to compensate for...
> 
> Especially if you see problems in the mid-band (channels 14-22). This  
> is caused by a single-ended amplifier (as opposed to a push-pull one)  
> that creates second-order harmonics of the low band that fall in the  
> mid-band.
> 
> If you see crap in 14-22 and 23 is OK then this is almost certainly  
> your problem, assuming your cable company is not re-mapping channel  
> numbers somehow.
> 
> In order of frequency the US cable channels are actually:
> 2 - 6
> 14 - 22
> 13 - 23
> 23 - and up

I think I blew a blood vessel reading that.  Is there a solution, or a way to compensate for this?  I will check what channels look worse than others when I get home.

Thanks for the info!