[linux-dvb] Need advice for HVR-1800

Andrey Falko ma3oxuct at gmail.com
Sun Aug 10 08:35:28 CEST 2008

On Sun, Aug 3, 2008 at 11:18 AM, Andrey Falko <ma3oxuct at gmail.com> wrote:
> Hi,
> I suspect that my HVR-1800 has a hardware defect where, it can't get
> signals via ATSC or NTSC. Before I send it back, I'd like to know if
> I'm doing something wrong or if I'm missing something. I've never had
> or played with a tuner card.
> First, I get my kernel to support the card by compiling the cx23885
> module. After modprobing cx23885, I get /dev/dvb/adapter0/ folder as
> well as a /dev/v4l folder containing video0 and video1.
> The next thing I did was try dvbscan
> /usr/share/dvb/atsc/us-CA-SF-Bay-Area . I am located in the Bay Area.
> I tried some other files in that directory, but none of them was able
> to tune to a frequency.
> Next, I tried running w_scan -a 0, this gave me the following output:
> w_scan version 20060902
> -_-_-_-_ Getting frontend capabilities-_-_-_-_
> -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
> ERROR: Sorry - i couldn't get any working frequency/transponder
>  Nothing to scan!!
> dumping lists (0 services)
> Done.
> I then tried dtvsignal from pcHDTV, it gave me this output:
> # ./dtvsignal -dvb 0
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> tuning to 57000000 Hz
> video pid 0x0021, audio pid 0x0024
> dtvsignal ver 1.0.7 - by Jack Kelliher (c) 2002-2007
> channel = 2 freq = 57000000Hz
>  30db       0%         25%         50%         75%        100%
> Signal:     |     .     :     .     |     ._____:_____._____|
> Signal: 000 .
> The HVR-1800 had two ports, an ATSC and TV Cable. I tried both w_scan
> and dtvsignal over both ports. I also tried to different cables with
> each.
> If I tell mplayer to use analog tv, I get a green screen. VLC gives me
> static. Without channels.conf mplayer should not play dtv. VLC
> reported that it could not tune.
> Unfortunately for debugging purposes I don't have either a Windows OS
> nor a TV that I can hook up.
> Should I buy an antenna? Return this card? Or is there something else
> I can try or something that I am missing?
> Thank you in advance for any help.
> -Andrey

I bought a cheap antenna for testing purposes, and I've been able to
pick up channels right away with dvbscan, so its not a hardware or
kernel driver problem. Thanks for everyone who's worked so hard to
make it possible to get this card supported in vanilla-sources!

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