[mythtv-users] Realtime Fine Tuning -- just a pipe dream?

Michael T. Dean mtdean at thirdcontact.com
Fri Aug 31 21:22:42 UTC 2007


On 08/31/2007 04:03 PM, Jay R. Ashworth wrote:
> On Fri, Aug 31, 2007 at 03:39:07PM -0400, Michael T. Dean wrote:
>   
>> On 08/31/2007 03:08 PM, Jay R. Ashworth wrote:
>>     
>>> Has the ability to adjust channel fine-tuning from LiveTV (permanently
>>> for a channel, obviously) ever been anything more than a Feature
>>> Wishlist entry?  I've almost never needed it, but on my sis's recently
>>> reworked box, 3 channels are semi-ugly, and I was trying to see why.
>>>       
>> What three channels/frequency ID's (and what TV source--i.e. cable)? 
>> There may be an even easier fix.  That sounds a /lot/ like a frequency
>> table issue.
>>     
> 4, 11, and 72.  :-)
>   

OK, not likely a freq table issue.  :(

>> In theory, fine-tuning should never be required for any channel.  The
>> tuner's hardware fine-tune mechanism should be more than enough for
>> variations from the spec--the resolution of the kernel's tuner module is
>> (currently) only 62.5kHz.  (And the values you specify for finetune are
>> in kHz, so unless the value you've chosen is high, you may not even be
>> affecting the value passed to the tuner module--though it all depends on
>> the specific frequency and rounding issues.  This doesn't mean you
>> wouldn't see a difference as there are temporal variations and the state
>> of the tuner before retuning can impact the end result.)
>>     
> Sure.  But it's a lot easier to tell if you don't have to
> change->save->retune->retune again...
>   



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