[linux-dvb] SkyStar HD2 issues, signal sensitivity, etc.

Manu Abraham abraham.manu at gmail.com
Tue Apr 14 02:00:29 CEST 2009


Manu Abraham wrote:
> Dave Lister wrote:
>> 2009/4/12 VDR User <user.vdr at gmail.com>:
>>> On Sat, Apr 11, 2009 at 5:47 AM, Dave Lister <foceni at gmail.com> wrote:
>>>> 2009/4/11 VDR User <user.vdr at gmail.com>:
>>>>> There is a new mantis tree being uploaded at:
>>>>> http://jusst.de/hg/mantis-v4l
>>>>>
>>>>> Please try this tree.  The upload should finish within 2 hours and is
>>>>> using DVB api 5 (aka s2api).
>>>> RESULTS (using "s2" dvb-apps):
>>>> - scanning DVB-S works
>>>> - scanning DVB-S2 doesn't work
>>>> - zapping DVB-S is fast
>>>>
>>> Can you please try a fresh clone of the tree?  I believe the fixes
>>> have now been applied.  Thanks!
>>>
>> Ok, I did and it seems fine. I mean for a Linux DVB-S2 card. :)
>> Compared to liplianin driver, only minus is non-working DiSEqC.
>> Because I am using a multiswitch,  I had to switch to liplianin. I am
>> sorry, but I'm definitely keeping an eye on your driver as well and
>> will be testing it as it gets updated!
>>
>> For other SkyStar HD2 users, this is a summary as of 2009.04.14:
>>   - kernel 2.6.29 + mantis-v4l works (except DiSEqC as far as I can tell)
> 
> 
> Diseqc works fine over here, with the VP-1041 and other cards, using
> the mantis-v4l tree.
> 
> 
>>   - kernel 2.6.29 + s2-liplianin works just as reliably + DiSEqC
> 
> 
> The s2-liplianin tree doesn't use an updated tree for the mantis
> based devices unfortunately. It is stuck with older changesets of
> the mantis tree.
> 
> The s2-liplianin tree contains (ed) ? some clock related changes
> which were not favourable for the STB0899 demodulator, which is
> capable of causing potential hardware damage.
> 
> 
>> Common issues:
>>   - zapping DVB-S2 channel causes tuner HW lockup (loss of signal until reboot)
>>   - zap DVB-S2 channel => AWFUL ultra-high pitched noise emitted from
>> the card (capacitors or coils?) - makes your head hurt in about 30mins
>>   - very poor TS (picture data) quality; signal = 95%, SNR = 70%,
>> STB/TV gives superb picture, but SkyStar/PC picture is corrupted every
>> few seconds, sound glitches, etc. (as if the signal was like 40% on
>> STB) - confirmed in VDR (Xine), MythTV, mplayer.
>>
>> These issues are present with both of my two SkyStar cards, which
>> hopefully eliminates faulty HW. To be frank, 
> 
> The cards what i have don't have the issues whatsoever you mention.
> 
> There could be multiple causes, since the cards that i have don't
> have the troubles whatsoever you mention.
> 
> * If you had those changes on your hardware and your card was
> susceptible to such issues, then that could be a possible reason.
> 
> * There are quite some hardware pirates, as noted here ..


Added the missing link.

http://www.twinhan.com/news_071011-1.asp

> 
> In any of your cases, If you have hardware related issues please
> contact to your supplier to have it checked/replaced by them.
> 
> NOTE: Always try to stick with a tree that's a mainline tree or the
> development tree, rather than tree's with unknown changes.
> 
> Regards,
> Manu
> 
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