Re: [linux-dvb] DVB-T USB dib0700 device recommendations?

[Marco Borm <linux-dvb@retrodesignfan.eu>]

Hi Markus,

it seams that you don't know what the Hauppauge Nova-T 500 is:
Its not a USB device itself, its a PCI card with a VIA PCI/USB-Bridge 
Chip connected to multiple DIBcom USB chips:
http://www.bttv-gallery.de/high/bttv-gallery.html

I bought the card with the idea in mind that it uses low power USB 
technology, but that was a mistake.
Next time I will buy a real usb device and know it isn't allowed to eat 
more than 2.5W.


Greetings,
Marco

Markus Rechberger wrote:
> On Mon, Apr 13, 2009 at 4:18 AM, Marco Borm <linux-dvb@retrodesignfan.eu> wrote:
>   
>> Hi Henrik,
>>
>> one of the cards in my system is the dib0700 based "'Hauppauge Nova-T 500".
>> Compared with the "TerraTec Cinergy 1400" I would say that the receiver
>> sensitivity is worse but the main problem I have is that the card
>> consumes a loot of energy (8-13W), which is much more than the
>> Terratec(5-6W).
>>     
>
> That's a little bit weird USB itself should provide max 5V 500mA which would be
> 2.5 Watt; if it requires more then the device has to be self powered.
>
> Maybe you can try to use a different USB device (eg. storage) just for
> testing the
> consumption. USB is supposed to require alot power (the controller).
> You might try to unload the ehci/ohci driver too.
>
> Markus
>
>   
>> I calculated this using measure values of the whole system captured with
>> a Conrad/Voltcraft Energy Monitor 3000.
>> Personally I am little bit shocked about that and wondering if this can
>> be true because the dib is a USB-device, but the Voltcraft is one of the
>> better measurement device.
>> Maybe the VIA usb-hub controller on the board is the problem?!
>>
>> Would be interesting of someone has the same or other experiences with
>> this card or other PCI based cards. Hauppauge ignores all my questions,
>> so I can't recomment products of this manufacturer anyway.
>>
>>
>> Greetings,
>> Marco
>>
>> H. Langos wrote:
>>     
>>> I've been trying to minimize energy consumption [...] But before running
>>> out in the street and buying the first dib0700 device I'd like to know if
>>> there are any devices that are
>>>
>>> - especially good [...]
>>>
>>> or
>>>
>>> - especially bad [...]
>>>
>>>
>>> _______________________________________________
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>>> For V4L/DVB development, please use instead linux-media@vger.kernel.org
>>> linux-dvb@linuxtv.org
>>> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>>>
>>>
>>>       
>> _______________________________________________
>> linux-dvb users mailing list
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>> linux-dvb@linuxtv.org
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>>
>>     
>
> _______________________________________________
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> linux-dvb@linuxtv.org
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>
>