[linux-dvb] Re: [PATCH] QT1010 - 125kHz step and fixes

Antti Palosaari crope at iki.fi
Wed Dec 6 00:05:49 CET 2006


Hei!

Andrew Waldram wrote:
> Hi tried your patch here in the UK
> 
> Massive improvement mostly works (megasky)
> 
> 3 Of the Crystal Palace transponders I cant get a lock, but can in
> windows and my Artec does in Linux
> 
> 481833330  = Works
> 561833330  = Works
> 529833330  = No Lock
> 578166670  = Works
> 537833330  = No Lock
> 505833330  = No Lock
> 
> Interestingly its all the transponders that carry BBC Video channels
> which I seem to recall transmit at a higher bitrate than the other
> channels.

Thanks for the feedback. Seems like new 125kHz stepping is working 
correctly and this one locking problem comes from different modulation 
(QAM16/QAM64)(?) schemes.

> Any further testing help I can provide??

Could you take some usbsnoops that I can see what is set differently in 
working and not working cases?

Download sniffer and tuning tool from:
http://benoit.papillault.free.fr/stats/get.php?location=../usbsnoop/sniff-bin-1.8.zip
http://nate.dynalias.net/ScanChannelsBDA/files/ScanChannelsBDA-2.0.0.7.zip
- extract both packages
- ensure that usb-stick is not plugged
- run SniffUSB.exe
  - in sniffer; install filter to PC-DTV Receiver
- start/run windows command prompt (cmd.exe)
  - plug usb-stick
  - run ScanChannelsBDA.exe from command prompt
   - select 4. from menu (Signal Statistics)
   - enter frequency in kHz (eg. 505833 for 505833333)
   - enter bandwidth 8 for 8MHz etc.
   - wait for results
   - stop tuning after 2-3 report lines by pressing any key
  - close tuning app (choise 10.)
  - unplug usb-stick
  - take usbsnoop.log from c:\windows\
  - take ScanChannelsBDA.log (from directory where ScanChannelsBDA.exe 
is run)
- rename logs or directory that contains logs and take new logs from 
another frequency
- compress files and email to me or put files in web-share

Regards Antti

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