[mythtv-users] Technotrend 1500 S: can scan, but tuning is difficult

belcampo belcampo at zonnet.nl
Tue May 4 16:29:28 UTC 2010

Jarle Thorsen wrote:
> 2009/12/5 Peter Bienstman <Peter.Bienstman at ugent.be 
> <mailto:Peter.Bienstman at ugent.be>>
>     Hi,
>     I have Mythbuntu 9.10, a Technotrend 1500 DVB-S card connected to a TV
>     Vlaanderen Triple Sat dish (basically a modified Multytenne with LNB 4
>     removed).
>     LNB 1 is hooked up to Astra 1, LNB 2 to Astra 3 and LNB 3 to Astra 2.
>     In Kaffeine, I can scan and watch channels just fine (with some
>     caveats, e.g. I
>     have to tune to a LNB 1 channel first before I can tune to a LNB 3
>     channel.)
>     In MythTV, doing a scan both on LNB 1 and on 3 seems to find all the
>     channels
>     just fine. However, when watching the (FTA) LNB 1 channels, some
>     work, but some
>     don't get further than 'partial lock', although I can watch all of these
>     channels without problems Kaffeine. For LNB 3, I was even unable to
>     find any
>     channel that fully locks...
>     I thought I needed to press 'C' during Live TV to switch to a
>     different LNB,
>     but that does not seem to do anything.
>     Perhaps there are some troubles with how MythTV handles the DiSEqC
>     switch. I
>     found some reference on the mailing list that for the Multytenne,
>     you need to
>     set the DiSEqC repeats to zero, which I did, but perhaps that's not
>     the issue
>     here.
>     Any suggestions?
> I am also experiencing what seems to be problems with diseqc switching. 
> I think maybe mythtv will neglect sending a diseqc signal even when such 
> signal is needed to tune the switch to the right lnb. I'm wondering if 
> anybody can tell us the logic behind the diseqc switching code. Will a 
> diseqc signal be sent whenever one tries to tune to a channel? If not, 
> when will mythtv choose not to send a diseqc switch signal?  
> -- 
> Jarle Thorsen
I'm in the same boat, untill now I use an very old .21 trunk version 
where diseqc works OK, I would love to use my Technotrend DVBS-2 card, 
but I'm not able to get more then 1 LNB, not with .22-fixes nor .23-fixes.
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