[linux-dvb] twinhan 1025 - problems locking onto signal

Manu Abraham abraham.manu at gmail.com
Mon Aug 13 15:06:46 CEST 2007

On 8/13/07, Simon Kenyon <simon at koala.ie> wrote:
> Simon Kenyon wrote:
> > just bought 3 cards for my mythtv master backend. silly me.
> >
> > anyway, using szap i find that tuning to a particular channel is at best
> > a hit and miss affair.
> > i have a 4x16 multiswitch which feeds astra28.2E into these three cards
> > and 4 satellite receivers.
> > they all get decent signal. i previously had a nexus-s and a technotrend
> > 1500ci in the box and they had no problems with the signal.
> >
> > is there anything i can do - other than binning them?
> > i'm using the hg tree of v4l-dvb.
> > is there an expermental tree out there with some improvements for this card?
> >
> a data point is that it will not lock onto any signals with a vertical
> polarization
> but will lock on to signals with a horizontal polarization (at the
> second attempt - not the first).
> the latter sounds like a timing issue.

Some of the 1025 cards have been very nasty. It resembles an older
case where one card would not tune to either vertical (or was it
Horizontal) completely stuck at one volytage level.

To take a bite at it, load the dst module with verbose=5, module
parameter. look at the logs, if you have timing errors you will see
them in the log.

> i have 5 other receivers and 2 dvb-s cards which have no problems with
> the signal coming from the multiswitch to which they are all attached.
> any help or even ideas of what to do to diagnose the problem out there?

just post the logs, will take in a look whether anything's possible.

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