[mythtv-users] HD PVR and IR transmitter for channel change (why)

Dave Richardson mythtv at derdev.com
Wed Dec 15 16:05:28 UTC 2010

 On Wed, 15 Dec 2010 08:59:31 -0700, Brian Wood <beww at beww.org> wrote:
> 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
>>  topic...
>>  http://www.mythtv.org/wiki/HDPVR
>>  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
>> STB.
>>  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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 So the wiki's content pertaining to support for the HDPVR IR emitter is 
 to offer more emitter options rather than to prescribe or limit options?
 That's very helpful, thanks to all!!!

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