[mythtv-users] adding 3rd tuner, is my plan OK?

Mike LaPlante mike at dividia.net
Tue Sep 11 17:52:42 UTC 2007

Andrew Gallatin wrote:
> Hi, 
> I'm planning to add a 3rd ATSC card to my system, but connected to an
> antenna which is pointed in a different direction than my main
> antenna.  My goal is to pick up PBS perfectly, as the PBS tower is in
> a different direction than all my other channels.  I'm concerned about
> distinguising between the cards in case the hardware changes, or the
> PCI bus probe order changes, etc.  My current DVB cards are a dvico
> fusion hdtv5 gold (cx88) and an air2pc hd5000 (b2c-flexcop).  I'm
> planning to add an air2pc (also b2c-flexcop, but old nxt2002 chip).
> Unfortunately, udevinfo provides no identifying information that I can
> find for my existing cards (*).  I was planning to write a script which
> uses a small C program to get the FE_GET_INFO info name ("LG
> Electronics LGDT3303 VSB/QAM Frontend" for both my existing cards) and
> create symlinks based on that. (All links in the range
> /dev/dvb/adapter[4..6] point at /dev/dvb/adaptor[0..2]).
> After adding the card and verifying the script works (and is run
> before the backed starts), I was planning to:
> - delete the existing capture cards, video sources, and inputs.
> - scan for channels using the aliased /dev/dev/adaptors (4,5,6)
> - hook up a single SD lineup to all cards
> - delete the PBS station from the LG adaptors on the main antenna
> - delete everything but PBS from the nxt2002 adaptor on the secondary 
>   antenna.
> So, before I start, what am I doing wrong?
> Thanks,
> Drew
> (*) 
> # udevinfo -a -p $(udevinfo -q path -n /dev/dvb/adapter0/frontend0)
> udevinfo starts with the device the node belongs to and then walks up the
> device chain, to print for every device found, all possibly useful attributes
> in the udev key format.
> Only attributes within one device section may be used together in one rule,
> to match the device for which the node will be created.
>   looking at device '/class/dvb/dvb0.frontend0':
>     KERNEL=="dvb0.frontend0"
>     SUBSYSTEM=="dvb"
>     SYSFS{dev}=="212:3"
>     SYSFS{uevent}==""
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The PCI Bus ID should be unique on each card.


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