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Re: [PATCH] FM1216ME_MK3 some changes




Hi,
 
> Am Montag, den 27.04.2009, 19:29 +1000 schrieb Dmitri Belimov:
> > Hi All
> > 
> > Step by step.
> > 
> > This is patch for change only range of FM1216ME_MK3. Slow tunning
> > is not a big problem.
> > 
> > diff -r b40d628f830d linux/drivers/media/common/tuners/tuner-types.c
> > --- a/linux/drivers/media/common/tuners/tuner-types.c	Fri
> > Apr 24 01:46:41 2009 -0300 +++
> > b/linux/drivers/media/common/tuners/tuner-types.c	Tue Apr 28
> > 03:35:42 2009 +1000 @@ -558,8 +558,8 @@ 
> >  static struct tuner_range tuner_fm1216me_mk3_pal_ranges[] = {
> >  	{ 16 * 158.00 /*MHz*/, 0x8e, 0x01, },
> > -	{ 16 * 442.00 /*MHz*/, 0x8e, 0x02, },
> > -	{ 16 * 999.99        , 0x8e, 0x04, },
> > +	{ 16 * 441.00 /*MHz*/, 0x8e, 0x02, },
> > +	{ 16 * 864.00        , 0x8e, 0x04, },
> >  };
> >  
> >  static struct tuner_params tuner_fm1216me_mk3_params[] = {
> > 
> > Signed-off-by: Beholder Intl. Ltd. Dmitry Belimov
> > <d.belimov@xxxxxxxxx>
> 
> if it does help anything for having all above 441 MHz in UHF ranges.
> 
> Acked-by: Hermann Pitton <hermann-pitton@xxxxxxxx>
> 
> There is simply no known broadcast in that gap on other freq. tables.
> 
> Can you please enlighten us who/what broadcasts there?

I don't know. This trick for solve problem with low sensitivity the tuners on end of band.
We get it from measuments.

> > 
> > With my best regards, Dmitry.
> > 
> > > Hi Dmitri,
> 
> Cheers,
> Hermann

With my best regards, Dmitry.

> > > Thank you for you responses.
> > > 
> > > Just a few more comments...
> > > 
> > > On Thu, 2009-04-23 at 20:36 +1000, Dmitri Belimov wrote:
> > > > Hi Andy
> > > > 
> > > > > Dmitri,
> > > > > 
> > > > > 
> > > > > On Wed, 2009-04-22 at 17:48 +1000, Dmitri Belimov wrote:
> > > > > > Hi All
> > > > > > 
> > > > > > 1. Change middle band. In the end of the middle band the
> > > > > > sensitivity of receiver not good. If we switch to higher
> > > > > > band, sensitivity more better. Hardware trick.
> > > > > 
> > > 
> > > > Several years a go your customers write some messages about bad
> > > > quality of TV if frequency of TV is the end of band. It can be
> > > > low band or middle. Our hardware engeneer make some tests with
> > > > hardware TV generator and our TV tuners.
> > > > 
> > > > If we set default frequency range for low and middle band,
> > > > quality of TV signal on 159MHz and 442 MHz is bad. When we make
> > > > our changes with moving end of bands the quality of TV much
> > > > better. And our system programmer for OS Windows use changed
> > > > bands for drivers. Customers be happy.
> > > 
> > > OK.  A properly run experiment wins over theory every time. :)
> > > 
> > > 
> > > 
> > > > You can test it if in your placement available TV programm on
> > > > 159MHz or 442MHz. This trick can be usefull for other tuners.
> > > 
> > > If you look at tveeprom.c, a number of other tuners are using that
> > > tuner definition:
> > > 
> > > $ grep FM1216ME_MK3 tveeprom.c
> > > 	{ TUNER_PHILIPS_FM1216ME_MK3, 	"Philips FQ1216ME
> > > MK3"}, { TUNER_PHILIPS_FM1216ME_MK3, 	"Philips FM1216 ME
> > > MK3"}, { TUNER_PHILIPS_FM1216ME_MK3, 	"LG S001D MK3"},
> > > 	{ TUNER_PHILIPS_FM1216ME_MK3, 	"LG S701D MK3"},
> > > 	{ TUNER_PHILIPS_FM1216ME_MK3, 	"Philips FQ1216LME
> > > MK3"}, { TUNER_PHILIPS_FM1216ME_MK3, 	"TCL MFPE05 2"},
> > > 	{ TUNER_PHILIPS_FM1216ME_MK3, 	"TCL MPE05-2"},
> > > 	{ TUNER_PHILIPS_FM1216ME_MK3, 	"Philips FM1216ME
> > > MK5"},
> > > 
> > > If your change makes things bad for the other tuners, we'll
> > > probably have to create an alternate entry for the other tuners
> > > instead of using the FM1216ME_MK3 defintion.  I suspect most of
> > > them are clones of the FM1216ME MK3 however, so it probably won't
> > > matter.
> > > 
> > > > > > 3. Set charge pump bit
> > > > > 
> > > > > This will improve the time to initially tune to a frequency,
> > > > > but will likely add some noise as the PLL continues to
> > > > > maintain lock on the signal.  If there is no way to turn off
> > > > > the CP after the lock bit is set in the tuner, it's probably
> > > > > better to leave it off for lower noise and just live with
> > > > > slower tuning.
> > > > 
> > > > We discuss with our windows system programmer about it. He sad
> > > > that in analog TV mode noise from PLL don't give any problem.
> > > 
> > > I would be concerned about phase noise affecting the colors or
> > > any FM sound carriers.  If the noise isn't noticably affecting
> > > colors to the human eye (do color bars look OK?), or sound to the
> > > human ear, then OK.
> > > 
> > > 
> > > >  But in digital TV mode
> > > > noise from PLL decreased BER.
> > > 
> > > I thought the FM1216ME MK3 was an analog only tuner.  I guess I
> > > don't know DVB-T or cable in Europe well enough.
> > > 
> > > 
> > > > > Leaving the CP bit set should be especially noticable ad FM
> > > > > noise when set to tune to FM radio stations.  From the
> > > > > FM1236ME_MK3 datasheet: "It is recommended to set CP=0 in the
> > > > > FM mode at all times." But the VHF low band control byte is
> > > > > also used when setting FM radio (AFAICT with a quick look at
> > > > > the code.)
> > > > 
> > > > Yes. You are right. We can swith CP off in FM mode.
> > > 
> > > OK.  Thank you.
> > > 
> > > > With my best regards, Dmitry.
> > > 
> > > 
> > > Regards,
> > > Andy
> > > 
> > > 
> > > 
> 

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