[clug] TV-wifi interference [was: Will pay money to get mythtv box working]

Jade Barton jade.barton at gmail.com
Wed Feb 2 05:20:35 GMT 2005

Yes, this happens to me too.  I have a rooftop antenna which the
"antenna guy" reckons has ample power to run HD DTV.

Here's a Summary:
-The system is a P2.4 with 1Gb RAM and 2x 40Gb WD HDD's stripe RAIDed
so there should be no bottlenecks.
- Rooftop antenna coming through a wall socket.
- It only happens when the HTPC talks on the network. I've had the
laptop sitting (physically) right next to the HTPC talking on the
network and it doesn't interfere.
- I have removed all other PCI devices from the HTPC fearing a lack of
BW on the PCI bus.
- I have turned my (Netgear) wireless card down to 25% power output.
- Physically putting the 2 cards at opposite ends of the computer PCI
slots and getting an external antenna.
- I've tried every DTV software known to man - Linux AND Windows
(please stop throwing things at me)

Nothing made it stop.  The only other thing I can think of is that the
power output of the WIFI card (including leakage off the card/cable
itself) sitting in close proximity to the DTV card affects the card
itself.  When I went hunting on the net I (suprisingly) couldn't find
anyone who had got this combo to work.

I put this down to another side effect of operating in/on the
unregulated, anything goes, cross-your-fingers-and-hope-for-the-best
world of the 30MHz/2.4GHz/5.8GHz bands.  Now we disable the card
everytime we watch TV (even the regular polling of the card when not
in use gets annoying after a while).

If anyone has got this working I would be interested in your setup.

PS. (RE: original post) I also spent weeks and weeks trying to get
MythTV to work with my Vision+ card.  I have seen a million links but
very few fully working (properly... for more than 10 minutes) setup's.
 Paul, I feel your pain.  Good luck.

Aw heck, who needs TV when you've got PC's anyway!

On Wed, 02 Feb 2005 14:50:08 +1100, Drew Parsons
<Drew.Parsons at anu.edu.au> wrote:
> On Tue, 2005-02-01 at 23:34 +1100, Eyal Lebedinsky wrote:
> > Paul Wayper wrote:
> > > AVerMedia DVB-T
> >
> > Which one? The original (761) or the new one (771)? The
> > new one has a better tuner with improved sensitivity.
> >
> Speaking of tuner interference, when I installed our wireless server
> (Linksys WRT54G) at home, my housemate bought himself a wireless card to
> use, to save cables criss-crossing the house.
> But he discovered that when he's actively using the wifi card
> (downloading something from the web), then the TV image from his digital
> TV card (I can't remember which brand, sorry) goes to pieces - the image
> freezes up, goes jerky.  When the download is complete, the TV image
> goes back to normal.
> I don't believe it's anything like an IRQ conflict on the motherboard.
> As I understand it, digital receivers behave like this when the signal
> is very weak.  My housemate is just using a table top antenna.  Maybe
> connecting to the rooftop antenna might help, but if he's going to get
> an extra cable like that then he might as well just get a long ethernet
> cable and forget about wireless.
> Has anyone experienced this sort of interference before?  Is there any
> obvious solution?
> Drew
> --
> linux mailing list
> linux at lists.samba.org
> https://lists.samba.org/mailman/listinfo/linux

More information about the linux mailing list