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Kworld ATSC-110 Antenna1/2 select

Friends,
>
> From:
> Trent Piepho <xyzzy (at) speakeasy.org>
> Date:
> Sun, 25 Feb 2007 12:05:19 -0800 (PST)
>
>
> On Sun, 25 Feb 2007, PS wrote:
>   
>> This patch is being withdrawn.  Recently detected instabilities in the
>> Kworld ATSC-110 when I2C-writing 5 bytes to the TUV1236D.  Not sure if
>>     
>
> Do you know what the PLL chip inside the TUV1236D is?
>
> If it's a common TUA603x chip, then sending 5 bytes is _not_ the correct
> protocol for setting the auxillary byte.
>
> The auxillary byte lets you control the AGC take over point settings.  This
> does make a difference.  I can get a better SNR by adjusting the TOP
> settings with my DTT7612 tuner.  See:
> http://www.speakeasy.org/~xyzzy/pictures/agctop.png
>
> That was for for cable.  I see the same thing now that I'm using an
> antenna.
>
> Setting the agc top value does not need to be done on every tune.  It only
> need be done when the device is opened to initialize it.  The DVB tuner
> object doesn't have an initialize callback, but AFAIK the plan is to add
> one for just this purpose.
>
>
>   
> ------------------------------------------------------------------------
>   
>
> From:
> CityK <CityK (at) rogers.com>
> Date:
> Sun, 25 Feb 2007 16:31:44 -0500
>
>
> Trent Piepho wrote:
>   
>> Do you know what the PLL chip inside the TUV1236D is?
>>
>> If it's a common TUA603x chip,
>>     
> yep, its a TUA6034T
>   
Confirmed.  A photo of an opened  TUV1236 from AnandTech website (?)
shows a 6034T chip inside.  The datasheet also has a block diagram
showing a TUA6034 MOPLL (RF AGC) chip.

If someone wants to tackle this problem, please let me know.  I can
email the TUV1236D datasheet/guide; it would be very useful.  I also
found a user manual for the SAA713x family, in case anyone needs it. 
Both are PDF's.
> ------------------------------------------------------------------------
>
>
> From:
> "Ed Windes (V4L)" <ewindes.46402841 (at) bloglines.com>
> Date:
> Mon, 26 Feb 2007 09:56:29 -0600
>
>
>> Has anyone else tried the patch and noticed similar symptoms?
>
> I've been using the patch, and haven't noticed any instability.  Can I do
> anything to help debug the problem you're seeing?
>
> I do notice that when switching from ATSC (DVB) to analog/antenna2,
> the card
> tunes to the correct antenna/channel, and then goes to static after about
> 3-4 seconds.  If I then tune to another analog channel and everything is
> good.  (Until the next time I go from digital to analog.)
>
Ed, I'm curious as to what program you're using to watch and switch
programs between ATSC/antenna1 and analog/antenna2?
  As for the symptom you'd described, I had not seen it, since I use
MPlayer to watch ATSC on antenna1, then switch to TVtime to watch analog
channels on antenna2.  This rather primitive use probably eliminated any
mis-interaction between the different pieces of code that control ATSC
and analog tuning.

Previous testing was limited to switching between an outdoor antenna on
Antenna1 and cableTV on Antenna2, using TVtime and KDEtv.  But, that is
no longer available - disconnected cableTV service.

Trying Kplayer this week - still struggling with it.

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