[linux-dvb] Dvico dual digital express - Poor tuner

Alex Ferrara alex at receptiveit.com.au
Sun Sep 28 23:29:37 CEST 2008


On 26/09/2008, at 8:19 AM, Alex Ferrara wrote:

> On 21/09/2008, at 8:41 PM, stev391 at email.com wrote:
>
>>> On Sun, Sep 21, 2008 at 3:35 PM, Alex Ferrara <alex at receptiveit.com.au 
>>> > wrote:
>>>> I am currently seeing inconsistent performance with the dvico dual
>>>> digital express. Some channels tune just fine, and others have the
>>>> impression of a very low signal strength.
>>>
>>> I have the same card in regional Australia, i had a similar problem
>>> problem, its working fine now though.
>>>
>>> One of my issue was that i had not scanned the channels properly,  
>>> did
>>> you generate your initial-tuning-data yourself and use scan to
>>> generate the channels.conf, or use somebody elses initial-tuning- 
>>> data
>>> ?
>>>
>>> It could be that the frequency in your channels.conf isnt accurate
>>> enough, from what ive experienced if you set the frequency in the
>>> channels.conf to be the center frequency of channel + 125kHz you
>>> should be ok.
>>>
>>> Also, there is an app called femon from dvb-apps package which will
>>> display the signal strength of the currently tunned channel, i just
>>> started that going and moved my indoor digital antenna around till i
>>> got max strength.
>>>
>>>
>>> Glenn
>>
>> Alex,
>>
>> Does this also happen in windows?
>> If so another possible solution is to either turn down your  
>> distribution amplifier or install attenuators on the RF input into  
>> the card.
>> In my mates setup I had to install a 12db attenuator inline to  
>> reduce the signal enough to within the cards dynamic range (An  
>> analogy of this is if you are at a rock concert next to the  
>> speakers it sounds sh!t due to the high volume however if you move  
>> away or muffle the sound slightly it will sound a lot better).
>> His older TV cards needed this higher strength signal to operate,  
>> if it didn't I would have just gotten rid of his distribution  
>> amplifier.
>>
>> I hope this helps.
>> (I have set up a total of 5 of these cards in linux so far and this  
>> has been the only issue with the current set of drivers. [Location  
>> is Melbourne]).
>>
>> Stephen.
>>
>>
>> -- 
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>>
>
>
> I have had some time to test this fully. Using "dirty" Windows Vista  
> I am able to tune all channels with perfect quality. On the same  
> computer, with nothing changes except for the OS, I can tune most  
> channels and only watch some. I am using Mythbuntu 8.04.1 with the  
> current v4l-dvb mercurial drivers and the extracted firmware using  
> the perl script in the kernel documentation directory. Kernel is  
> 2.6.24 incidentally.
>
> There must be something going on in the driver or the firmware is  
> not quite right. One of my friends in Canberra also has one of these  
> dual express cards, and he is having very similar issues to me.
>
> I also tested a Dvico Dual Digital 4 PCI card, and found that it  
> worked perfectly. I believe mine is a v2 card, but I am not 100%  
> sure on that one.
>
> Regards
> Alex Ferrara
>
> Director
> Receptive IT Solutions
>
> _______________________________________________
> linux-dvb mailing list
> linux-dvb at linuxtv.org
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb


Does anyone have any ideas or similar experiences?

Regards
Alex Ferrara

Director
Receptive IT Solutions

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