[mythtv-users] Can't tune to a particular DVB-S multiplex with one card but can with another conected to same source.

[Stephen Robertson]

>> I've got a strange problem that I don't know how to diagnose.
>>
>> One multiplex appears to not be able to be tuned by one of my cards
>> but the other doesn't have a problem.  This applies to both scheduled
>> recordings and live TV.
>>
>> The cards are Hauppage Nova-HD-S2 and Turbosight TBS8922.  The
>> Hauppage is the one that is having problems.
>>
>> Both are connected to the same source within Myth (as well as
>> physically to inputs on the same quad LNB), so if I understand things
>> correctly are using the same tuning information.
>>
>> The multiplex I am having problems with (as far as I can figure from
>> http://www.lyngsat.com/Eutelsat-28A-and-Astra-1N-2A-2B.html) is on
>> 10714H (Channel 4, Film4, Film+1 More 4 UK +1) (Freesat in the UK)
>
> This sounds like it might be related to my situation.
>
> I used to have a similar problem with a Satix S2 dual tuner and a Nova HD-S2, I found that if I did my scanning using the Nova HD-S2 I was able to tune everything with any tuner if I used the Satix S2 I had problems with CH4HD and BBC HD. The BBC HD problem disappeared when they changed their modulation recently but Ch4HD remained a problem.
>
> At one stage it was necessary to scan with the Satix the go back and re-scan BBC HD and CH4HD muxes with the Nova HD!
>
> I believe the problem I saw is related to different handling of auto FEC settings in different drivers, it may be possible to tickle the database entry for this mux and add the correct FEC or change to Auto if your problem is the other way around.
>
> Might not be your problem but it sounds similar enough to be worth a try.
>
> I don't have the problem any more because the different cards are used by different sources so I don't know if 10714H is affected in the same way.
>
> Andre

I've manually fiddled the row in the dtv_multiplex table to change the
symbol rate to 22000000.(per
http://www.lyngsat.com/tvchannels/uk/Film-4--1.html)  The channels
that were causing problems before now seem to tune successfully.  I'll
try when I get a chance to run the tuning on one card and then the
other and compare the results.

Stephen