[mythtv-users] HD PVR and IR transmitter for channel change (why)
beww at beww.org
Wed Dec 15 15:59:31 UTC 2010
On Wednesday, December 15, 2010 08:29:34 am Dave Richardson wrote:
> Sorry if this is remedial, the wiki does not appear to address the
> If the setup for an HD PVR from cable STB is
> STB --> [composite] --> HD PVR --> [USB] --> Myth BE
> Then the wiki appears to jump straight to a conclusion that the IR
> Transmitter channel change wiring and setup is
> HD PVR --> [ir emitter] --> STB
> with a lot of instruction about how to ensure modules/kernel and
> myth setup are done.
> My QUESTION: there seems to be a leap or assumption made that this
> is the best/correct IR transmitter setup to channel change on the
> Can someone please elaborate on this? Are there other options or at
> least reasons why this approach is favored? My gap in understanding
> is that this is not similar to how IR transmitting is done when
> capturing from STB -> PVR 550/150 or other setups. Why is the HD
> PVR IR Transmitter favored over IR transmitting from the BE?
I don't know, but some possibilities are:
The placement of the HD-PVR may be different from the location of the BE,
up to the 15 foot limit for a USB cable anyway.
In my case the HD-PVR is on the other side of a wall from the BE
machine, which is in the garage.
Obviously you can run a wire from the BE to an IR emitter, and you can
probably run it farther than the limit for USB, but using the HD-PVR's
emitter eliminates one cable.
The HD-PVR emitter may have more IR power than a serial-port driven
emitter, since it has it's own power source.
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