dvbtune and LOF - Am i missing something?

[madmax25]

Hello:

I have what I think is an "Universal" LNB connected to a WinTV Nova S Plus Hauppage card on my PC and am running Linux Fedora Core.

I am an unable to get dvbtune-0.5 to work. However, vlc media player is able to play all channels on that transponder on the same PC. But I need to get dvbtune to work. This is the background:

Satellite: ABS1
TP Frequency: 12579 H
SR: 22000
FEC: 3/4
Country: India

I am trying to get a dump of the SI information using the following command

dvbtune -f 12579000000 -s 22000 -p H -i

also tried

dvbtune -f 12579000 -s 22000 -p H -i

A web search revealed that I will have to take care of the offset introduced by the LO frequency which is 9.75/10.600 and that I will need to subtract this value from the TP frequency.
Hence I have tried (12579 - 9750 = 2829) and (12579 - 10600 = 1979)

dvbtune -f 2829000 -s 22000 -p H -i
dvbtune -f 2829000000 -s 22000 -p H -i

dvbtune -f 1979000 -s 22000 -p H -i
dvbtune -f 1979000000 -s 22000 -p H -i

I have also tried using 10.75 as the offset.

The output that I get has always been something like

[root@localhost dvbtune-0.5]# ./dvbtune -f 12579000000 -s 22000 -p h -i
Using DVB card "Conexant CX24123/CX24109"
tuning DVB-S to L-Band:134537405, Pol:H Srate=22000000, 22kHz=off
polling....
Getting frontend event
FE_STATUS:
polling....
polling....
polling....
polling....
polling....

Can someone help me to understand why I am facing this problem and how to deal with the LO frequency?
Would also appreciate knowing whether the frequency parameter passed to dvbtune should be in Hz or KHz or Mhz or GHz.

My ultimate aim is to be able to tune to a certain transponder and extract EPG information for all channels that is on that transponder. (at least for ones where EPG exists).
Thanks.

Madhu

 

[madmax25]

ok..managed to figure it out myself and for the sake of the 30 odd people who seemed to have viewed this request for help here is the answer:

polarization was vertical as against horizontal. Lyngsat gave me wrong information. vlc had worked because it had a list of satellites already built into its database and took the correct polarization value.

as for dvbtune, after going through its source code in detail, it seems to be able to automatically handle absolute frequencies as it subtracts the appropriate LOF frequency.
Hats off to dvbtune

Regards,
Madhu

 

[digiblur]

ok..managed to figure it out myself and for the sake of the 30 odd people who seemed to have viewed this request for help here is the answer:

Way to go!

I don't think you'll find many users using dvbtune around here.

 

[madmax25]

digiblur.... why is it that dvbtune is not popular? whats the substitute for that?

 

[digiblur]

digiblur.... why is it that dvbtune is not popular? whats the substitute for that?

Most people are using Windows DVB boxes around here.