[linux-dvb] [PATCH] Tuner calibration for some Nova-T devices

Stephen Rowles stephen at rowles.org.uk
Fri Dec 15 12:44:03 CET 2006


treza at chez.com wrote:
> Hi folks
>
> Here is a patch for Hauppage Nova-T-Stick and Nova-T-500 users.
> It sets the MT2060 IF1 frequency according to the
> calibration values stored in the EEPROM.
>
> It is supposed to enhance the signal quality, but, hey,
> there is no guarantee.
> Feedbacks would be much appreciated, to know whether it
> deserves being applied.
>
>   

Hi,

I have a nova-t-stick, I've applied your patch and re-installed the 
module. I probably not the best case as my system doesn't seem to work 
very well; I have some i2c issues and get lots of kernel messages like ( 
mt2060 I2C read failed) when watching TV. I have a via sp13000 which I'm 
using to run freevo. It has fedora core 5, with the latest kernel 
2.6.18-1.2239.fc5. And I have a compiled set of modules from hg.

with your patch tzap still fails to get signal lock. and looking at the 
signal numbers from dvbtune the strength appears to be pretty much the 
same as my last post about my tzap problems to this mailing list. (see 
below for numbers with your driver patch)

 From xine, which is the only way I can successfully use my DVB stick 
atm, the stick seems to work pretty much the same as before, getting a 
picture takes a while to appear but it does work and tune, there doesn't 
appear to be any noticeable change to the picture quality (which was 
pretty good anyway).

I'm happy to try other things if you want more testing. And if you have 
any suggestions about how I solve my i2c issues then that would be ace!


tzap and tune output:

./tzap "BBC ONE"
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 706000000 Hz
video pid 0x0258, audio pid 0x0259
status 08 | signal ffef | snr 0000 | ber 02000200 | unc 00008333 |
status 08 | signal ffef | snr 0000 | ber 02000200 | unc 00008333 |


./dvbtune  -f 706000000 -m -pnr 600
Using DVB card "DiBcom 7000PC"
tuning DVB-T (in United Kingdom) to 706000000 Hz
polling....
Getting frontend event
FE_STATUS:
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_SYNC
Bit error rate: 2097151
Signal strength: 25784
SNR: 0
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_SYNC
<transponder type="T" freq="706000000">
Nothing to read from fd_pat
Nothing to read from fd_sdt
</transponder>
Signal=25764, Verror=2097151, SNR=0dB, BlockErrors=0, (S|L|C|SY|)
Signal=25766, Verror=2097151, SNR=0dB, BlockErrors=0, (S|L|C|SY|)
Signal=25760, Verror=2097151, SNR=0dB, BlockErrors=0, (S|L|C|SY|)
Signal=25777, Verror=2097151, SNR=0dB, BlockErrors=0, (S|L|C|SY|)
Signal=25766, Verror=2097151, SNR=0dB, BlockErrors=0, (S|L|C|SY|)
Signal=25774, Verror=2097151, SNR=0dB, BlockErrors=0, (S|L|C|SY|)
Signal=25748, Verror=2097151, SNR=0dB, BlockErrors=0, (S|L|C|SY|)
Signal=25760, Verror=2097151, SNR=0dB, BlockErrors=0, (S|L|C|SY|)






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