> From: [email protected]
> To: [email protected]
> Date: Mon, 15 Feb 2010 19:14:00 -0500
> Subject: Re: [ivtv-users] hvr-1600, frame CRC mismatch - incomplete frame
>
> On Mon, 2010-02-15 at 16:22 -0500, Kyle Lil wrote:
>
> > Previously I'd had the tuner connected at the end of additional
> > splitters and devices, but I shortened the chain in troubleshooting.
> > I'll try attenuating the signal again to see if that helps. I hadn't
> > consider the possibility that the cable signal might exceed the
> > devices input limits.
>
> Actually, I've just verified that my antenna and preamp is overdriving
> my HVR-1600 for two digital TV stations. I could verify independently
> with my Sony TV, which provides SNR, signal, and Error readouts of the
> same channels. For me, WJLA and WUSA over the air are *really* strong
> according to the TV, but my MythTV recordings show errors. Here's the
> output of femon while MythTV is showing WUSA:
>
> status 1f | signal 011d | snr 011d | ber 000001c9 | unc 000001c9 | FE_HAS_LOCK
> status 1f | signal 011d | snr 0118 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0118 | snr 0118 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0118 | snr 0118 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0118 | snr 0118 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0118 | snr 0118 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0118 | snr 0118 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0118 | snr 0118 | ber 0000006a | unc 0000006a | FE_HAS_LOCK
> status 1f | signal 0118 | snr 0118 | ber 000007f3 | unc 000007f3 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0113 | snr 0118 | ber 00000836 | unc 00000836 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0122 | snr 0122 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0122 | snr 0122 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0122 | snr 0122 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0118 | snr 0118 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 011d | snr 011d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0122 | snr 0122 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
>
> SNR is great, but I get errors every once in a while.
>
> The pattern looks really similar to what you reported from azap.
>
> My problem is subject to weather variations for me, so it doesn't happen
> all the time. However, clear, cold winter nights seem to lead to the
> most problems recording these station with my HVR-1600. (I could turn
> down my amp, but since WETA, a really good station, is a really weak
> signal for me, I probably won't.)
>
>
> I think you'll just need to attenuate your cable signal before it hits
> the HVR-1600.
>
> Regards,
> Andy
>
>
> _______________________________________________
> ivtv-users mailing list
> [email protected]
> http://ivtvdriver.org/mailman/listinfo/ivtv-users
p.s. The AGC values I mentioned were for the Out Of Band data stream. For some
reason, my cable box does not list the In-band AGC value. It only gives the
SNR, which is ~35dB, comparable to what the HVR-1600 reports. By comparison,
the OOB SNR was ~21dB.
_________________________________________________________________
Hotmail: Free, trusted and rich email service.
http://clk.atdmt.com/GBL/go/201469228/direct/01/_______________________________________________
ivtv-users mailing list
[email protected]
http://ivtvdriver.org/mailman/listinfo/ivtv-users
