[linux-dvb] Re: My DVB-c patch (Re: The drivers and HTV)

[Ralph Metzler <rjkm@metzlerbros.de>]

Holger Waechtler writes:
 > Dennis Noordsij wrote:
 > >>- Disables zigzag for everything except DVB-s.  This is from Metzler
 > >>  driver.  Maybe someone with DVB-t needs it?  In that case change the
 > >>  "!= FE_QPSK" to "== FE_QAM".

Sorry, I only disabled it for debugging a new cable frontend which was
impossible with zigzag turned on.
 

 > > Disabled zigzag. For QAM_64, if I hit the exact frequency, it locks 
 > > immediately. Picture is perfect, etc. But I have 2 cards, and if I let the 
 > > frequency bending step in (i.e. offset the frequency by one stepsize, 
 > > 62.5kHz) locking for that card becomes more unreliable, it does better if it 
 > > doesn't bend the frequency at all. So it's very touchy, if I step 62.5kHz 
 > > away from the "right" frequency the results get much worse.
 > 
 > Ok, I'll postpone applying this patch. You can't simply disable 
 > frequency bending when you have multiple cards in the same box. When 
 > both try to tune on the same frequency I had in some setups the effect 
 > that both frontends loose lock due to RF interferences.


Does this really happen with multiple cards or only if two tuners are
on the same card/board right next to each other?


 > >>- Has anyone ever tested this auto inversion thing?  DVB-c is far too slow
 > >>  to tune and lock for this auto inversion code to work.  Therefore you
 > >>  need to manually set it.
 > > 
 > > 
 > > I had inversion turned off with the reg0 |= 0x20 code in ves1820.c
 > > (Your HTV channels.conf specifies inversion off for all channels, hope that 
 > > was right :)
 > 
 > You should use INVERSION_AUTO if you don't know for sure your providers 
 > inversion settings.


But it should also be possible to set it manually.



Ralph


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