[mythtv-users] PVR-150/500 and bttv?

[Michael T. Dean]

Joe Votour wrote:

>I've read the thread you you mention, and call me
>skeptical, but I don't buy it 100%.
>  
>
Uhhh.  OK.  If you want to focus on the anthill on top of the mountain 
instead of the mountain itself...  The point of quoting that post was 
not to say that the tuner definition is correct (considering I don't 
have a clue which tuner the OP is using)--it's the other 98% of the 
content that gives several tips on how to improve signal quality...  I 
assumed that was clear from the fact that I was replying to (and 
quoting) Greg's post where he says, "In my case it turned out to be a 
signal strength problem."

>Yes, a poor cable signal can cause all sorts of
>problems.  But short of doing a comparison between a
>PVR-500 in Windows and the same card in Linux, you
>just can't say that you have the tuner definitions
>100% correct.
>  
>
"The tuner definitions are correct according to the tuner datasheets," 
doesn't say that the tuner definitions are 100% correct...  I never 
claimed that they were right--only right according to the datasheets...  :)

>I work in the video industry, having worked on a
>set-top box, and before that, cable modems.  The main
>supplier of tuner chips that we use (starts in "B",
>ends in "com", you figure the middle out) is the
>absolute worst.
>
>When their datasheet isn't outright lying, it's
>missing information, and when the datasheet is
>complete, the reference code is totally different. 
>Then, there's also information that is only given to
>the largest customers who pay a ton of money.
>  
>
Excellent.  Then, with your experience in finding the lies and missing 
information in datasheets, I can't wait to see a patch for your tuner 
definition posted to the V4L list...  I won't be offended if you, or 
anyone else, change the definition.  I'll be extremely pleased if 
someone finds a better definition.  That's the point of open-source, 
anyway.  If I wanted my code to stay as broken as the day I wrote it, 
I'd work for a commercial software company.  ;)

>Right now, I have a PVR-250 that is of quality that is
>much greater than my PVR-500 in the same machine.  The
>TV does show that the signal isn't the greatest - but,
>when signal runs through the PVR-500, every now and
>then I get wavy lines and static, which is not visible
>on the TV, or the PVR-250.
>
>Since I have access to the equipment at work, I'll be
>bringing home a cable analyzer to check my signal
>level, but not everybody has access to this.  I'm
>hoping that perhaps an upgrade in the ivtv driver (I'm
>using the 0.2 series) will help out.  I might just
>have to run a Windows/Linux comparison at some point.
>  
>
Excellent.  I'm looking forward to seeing your results.  I can't do the 
Windows/Linux comparison myself--as I don't have Windows or an RF 
modulated feed with which to test the tuner.

Mike

>-- Joe
>
>--- "Michael T. Dean" <mtdean at thirdcontact.com> wrote:
>
>  
>
>>Greg Woods wrote:
>>
>>    
>>
>>>On Sun, 2005-09-11 at 17:01 -0400, Michael Tiller
>>>      
>>>
>>wrote:
>>    
>>
>>>>I don't know if the BTTV card just sucked (it was
>>>>        
>>>>
>>a Win-TV card) or if
>>    
>>
>>>>there was some kind of interference with the
>>>>        
>>>>
>>PVR-150?!?  If anybody
>>    
>>
>>>>knows of a reason why the presence of the PVR-150
>>>>        
>>>>
>>should make the BTTV
>>    
>>
>>>>signal suck and knows a way to address the
>>>>        
>>>>
>>problem, I'm all ears.
>>    
>>
>>>I tried to use a pcHDTV-3000 in the same machine as
>>>      
>>>
>>a PVR-150, and had
>>    
>>
>>>the same problem: the PVR-150 looked great, the
>>>      
>>>
>>signal for the 3000
>>    
>>
>>>sucked. In my case it turned out to be a signal
>>>      
>>>
>>strength problem.
>>    
>>
>>> 
>>>
>>>      
>>>
>>As I posted in the other signal strength thread, you
>>should check out: 
>>
>>    
>>
>http://www.gossamer-threads.com/lists/ivtv/devel/17953#17953
>  
>
>>Mike
>>
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>>
>>    
>>
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>  
>
>
>
>
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