[linux-dvb] TerraTec Cinergy DT USB XS Diversity (Quality with linux worse then with Windows)

Devin Heitmueller devin.heitmueller at gmail.com
Sun Dec 21 20:52:08 CET 2008


On Sun, Dec 21, 2008 at 1:31 PM, Holger Rusch <holger at rusch.name> wrote:
> Devin Heitmueller schrieb:
>>
>> On Sun, Dec 21, 2008 at 10:33 AM, Holger Rusch <holger at rusch.name> wrote:
>>>
>>> Shameless repost. No idea? Anybody?
>>
>> Are you using the latest code from http://linuxtv.org/hg/v4l-dvb,
>
> Yes, i use the hg tree.
>
>> including the newer 1.20 firmware?
>
> storage:/lib/firmware# ls -la dvb-usb-dib0700-1.20.fw
> -r--r--r-- 1 root root 33768 20. Nov 14:08 dvb-usb-dib0700-1.20.fw
>
> (the only .fw file in the directory
>
> storage:/lib/firmware# md5sum dvb-usb-dib0700-1.20.fw
> f42f86e2971fd994003186a055813237  dvb-usb-dib0700-1.20.fw
>
> Where do i get the newest one, if this one isnt the newest?
>
>> Have you tried turning off the LNA and see if there is any difference
>> in SNR?  While an amplifier can be a good thing in some cases, if
>> you're to close to the transmitter the LNA may be driving the signal
>> too hard for the demodulator.
>
> I changed:
> options dvb_usb_dib0700 force_lna_activation=1
> to
> options dvb_usb_dib0700 force_lna_activation=0
>
> and retried (rebootet).
>
> It did not help.
>
>> Is the SNR level always being reported as poor, or only when the
>> signal is dropping out?
>
> SNR is constantly poor <45%.
>
> And now?

Ok, so you've got the latest code and firmware (there is only one
version of the 1.20 firmware).  And we know it's not the LNA then.

You said the SNR is < 45%, but as far as I can see the SNR function
isn't implemented on the dib7000p or the dib7000m, so it should always
be zero.  Are you sure you weren't referring to strength?  Also, what
application are you using to watch the stream?

Devin

-- 
Devin J. Heitmueller
http://www.devinheitmueller.com
AIM: devinheitmueller



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