[mythtv-users] Signal strength, DVB-T

Brad DerManouelian myth at dermanouelian.com
Sun Feb 3 22:29:26 UTC 2008


On Feb 3, 2008, at 2:16 PM, Bruce Richardson wrote:

> On Sat, Feb 02, 2008 at 12:55:13PM -0500, Tom Dexter wrote:
>> If the signal strength you're referring to in mythtv is the one that
>> momentarily appears in the OSD when you change channels, I think that
>> (at least in 0.20.2 with my HD-5500 cards) there might be some sort  
>> of
>> timing issue with the way mythtv reads that strength.  Mine sometimes
>> even shows zero.  However, if I actually display the strength by
>> either using the F7 key in mythtv or using a separate program (I use
>> femon a lot) it'll be anywhere from 60 to 95.
>
> I see the same signal strength figures when changing to a channel,  
> when
> pressing F7 or when using tzap.  All of these tell me that I am seeing
> signal strengths of 28 to 35% and yet the picture is clear and it's  
> all
> working.  I think that might be an issue with the driver or firmware.

Signal strength has little to do with signal quality.
I wish I could link to the page I read about it but I can't find it  
now. Basically, it said that signal strength means pretty much  
nothing. Signal quality is the real measurement of number of good  
packets vs. errors. 


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