Re: Unreliable tuning with HVR-950q

[Steven Toth <stoth@linuxtv.org>]

Scott Bronson wrote:
> On Mon, Sep 22, 2008 at 12:22 PM, Steven Toth <stoth@linuxtv.org> wrote:
>> Watch the SNR value, it's measures in db and expressed in hex with one
>> decimal place. So, 0x102 = 25.8db
> 
> OK.  Watching the display in MythTV, when I see this I immediately
> know that the tuner will never lock.
> 
>     Signal 0% | S/N 2.4dB | BE 0 | (L__) Partial Lock
> 
> 
> And when I see this, I know that in 1/2 second I'll see a TV picture:
> 
>     Signal 0% | S/N 2.4dB | BE 0 | (LAM) Lock
> 
> 
> It's always the same: 0% signal, 2.4dB S/N and BE 0.  Does "L__" offer
> any hints as to why locks are so elusive?

Scott, thanks for the info.

I'm not actually comfortable trusting the myth display without digging 
into it's code, I don't know what it does with the values. Try using the 
azap statistics, which I'm happier to discuss.

At this point I don't see any software fixes, we're not going to make 
the driver retune a number of times. You're overwhelming the tuner/demod 
frontend with high RF levels.

If you have SNR numbers they would be good to see, but they are for 
informational purposes at this point. They are a curiosity.

You likely need an attenuator.

- Steve

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