[linux-dvb] Re: setting the proper transonder value

[Sheetal_Pandey <Sheetal_Pandey@Satyam.com>]

Hi Malcolm,

I tried the following
dvbstream  -o -f 1150 -p H -I 1 -s 28125 517 700. I used dvbtune instead of
dvbstream.It says could not lock to the given frequency.It shows that
freq=1150 S/R=28125 etc. Do I have to change some where else for it to take
these values.

I changed the parameters as above for RTPi in channels.conf and ran ./vdr.I
am not very friendly with the menu on screen so I was not able to enter into
that.Up and down was fine.

Regards,
Sheetal Pandey


-----Original Message-----
From: Malcolm Caldwell [mailto:malcolm.caldwell@ntu.edu.au]
Sent: Wednesday, February 26, 2003 12:18 PM
To: Sheetal_Pandey
Cc: linux-dvb@linuxtv.org
Subject: Re: [linux-dvb] setting the proper transonder value


On Wed, 2003-02-26 at 14:35, Sheetal_Pandey wrote:
> Hi,
> 
> I am using the Hauuppauge WinTV nexus-S card.I have tuned the antenna to
> ASIASAT 2.I am trying to lock the card to European bouque but since I am
> using the card for the first time ,I am not comfortable in giving the
proper
> values.
> 
> I have another digital satellite receiver which is locked properly to
> European bouque ,I mean that the signal is proper.
> 
> The downlink freq is 4000 MHZ,fec 3/4,Symbol rate 28.125 Mbaud.I am using
a
> C band LNB with local oscillator freq 5150.Can somebody help in filling
the
> proper values.

I have this working - asiasat2 and European Bouquet.  I am fairly sure
the command line for eg. dvbstream is: (for eg for RTP)
dvbstream  -o -f 1150 -p H -I 1 -s 28125 517 700
(I can't confirm this at the moment as vdr is currently running)

The problem is that the dvb stuff assumes Ku band LNB where you tune to
L = freq - LOF.

With c-band L = LOF - freq.

(L is the frequency on the cable from the LNB to the card).

Luckily most of the tools accept L band frequences directly.  So to tune
to the European Bouquet you need to tune to 1150 (ie 5150 - 4000).

In VDR I have set the LOF to 0 and I put 1150 in the channels.conf.

I think that VDR could be modified to accept the real frequencies.  All
that is needed is to put freq=abs(freq).

(If freq - LOF = L, then LOF - freq = -L.  By putting the abs in we get
the correct frequency)

I must add that I have not tried this modification yet. (What do other
think?  Klus?)

> 
> Regards,
> Sheetal Pandey
> 
> 
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