[ivtv-users] hvr-1600, frame CRC mismatch - incomplete frame

[Kyle Lil]

> Date: Tue, 16 Mar 2010 15:49:54 -0400
> From: dheitmueller at kernellabs.com
> To: ivtv-users at ivtvdriver.org
> Subject: Re: [ivtv-users] hvr-1600, frame CRC mismatch - incomplete frame
> 
> On Tue, Mar 16, 2010 at 2:46 PM, Kyle Lil <kpl388 at msn.com> wrote:
> > With cables/splitter arranged in a configuration to give the HVR-1600 a
> > stronger signal I see an improvement in SNR from ~0x146 to ~0x14a when I
> > change qam_gain from 0x02 to 0x01. Rearranging connections to provide the
> > HVR-1600 a weaker signal, I see a similar improvement from 0x13c to 0x140
> > when changing from 0x02 to 0x01. In both cases the SNR appears stable, never
> > changing by more that 0x002.
> 
> That's good info, but is the error rate consistent on both a strong
> and weak signal?
> 
> Devin
> 
> -- 
> Devin J. Heitmueller - Kernel Labs
> http://www.kernellabs.com
> 
> _______________________________________________
> ivtv-users mailing list
> ivtv-users at ivtvdriver.org
> http://ivtvdriver.org/mailman/listinfo/ivtv-users

Interesting. It looks like the error rate is ~1 per 25 minutes with qam_gain set to 0x01 and the weak SNR (0x140). With the qam_gain set to 0x02 and the weak SNR (0x13c), the error rate is back to ~2 per minute. So it seems that the error rate is more related to the qam_gain setting than the SNR. I was actually just taking a shot in the dark by changing this parameter. Could you tell me what it actually does? Is this related to AGC gain somehow?




 		 	   		  
_________________________________________________________________
Hotmail: Trusted email with Microsoft’s powerful SPAM protection.
http://clk.atdmt.com/GBL/go/210850552/direct/01/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ivtvdriver.org/pipermail/ivtv-users/attachments/20100316/9923bbf5/attachment.html>