[mythtv-users] Having trouble recording OTA since adding a second tuner

Terence Ripperda ripperda at gmail.com
Mon Mar 15 19:07:30 UTC 2010


On Mon, Mar 15, 2010 at 12:06 AM, Kevin Ross <kevin at familyross.net> wrote:

> Terence Ripperda wrote:
>
>> I've been experimenting with MythTV, and recently added a second tuner.
>> Ever since adding the second tuner, I've been having random trouble locking
>> to the OTA signal on one of the 2 tuners. I haven't gathered a lot of data
>> yet, but it appears to be random, isn't tied to either tuner specifically.
>> Usually, when this happens, the current tuner will tune to some stations,
>> but not other stations. if I switch to the "other source", I'm then able to
>> tune into the station I'm having trouble with.
>>
>> Both tuners are identical Hauppauge HVR950Q usb sticks, using the xc5000
>> driver.
>>
>> I did have to use a coaxial splitter to split the incoming signal to both
>> of the usb sticks. I noticed other mails on this list that indicated signal
>> loss can cause problems like mine.
>>
>> I'm curious what the steps towards debugging something like this would be.
>> if this is a signal loss issue, I can purchase a booster, but I'd like to
>> know if there's a way to verify this is the cause, before I do spend money.
>>
>> I did catch this in my logs:
>>
>> 2010-03-04 19:00:02.629 Started recording: Community "Physical Education":
>> channel 1361 on cardid 2, sourceid 1
>> 2010-03-04 19:00:42.186 UPnpMedia: BuildMediaMap VIDEO scan starting in
>> :/hosts/readynas/Mythtv/
>> videos:
>> 2010-03-04 19:00:42.512 UPnpMedia: BuildMediaMap Done. Found 115 objects
>> 2010-03-04 19:01:15.262 AutoExpire: CalcParams(): Max required Free Space:
>> 3.0 GB w/freq: 15 min
>> 2010-03-04 19:01:43.750 DevRdB(/dev/dvb/adapter0/frontend0) Error: Poll
>> giving up
>> 2010-03-04 19:01:43.757 DVBSH(/dev/dvb/adapter0/frontend0) Error: Device
>> error detected
>> 2010-03-04 19:01:43.814 DVBRec(2:/dev/dvb/adapter0/frontend0) Error:
>> Stream handler died unexpectedly.
>> 2010-03-04 19:01:44.335 TVRec(2): Changing from Watching RecordingOnly to
>> None
>>
>> I did not see any other errors in the kernel output (from the xc5000
>> driver).
>>
>> Thanks for any help/tips,
>> Terence
>>
>
> To determine if the splitter is lowering your signal strength too much,
> when you have problems tuning a channel, remove the splitter and plug the
> antenna cable directly into the tuner and see if you can then tune the
> channel.


Thanks Kevin, I'll give that a try tonight. is there also a way to log/see
what the signal strength is of an active broadcast? I'd like to compare
strength between various test cases.



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