[mythtv] Problems with Hauppauge Nova TD Dual Tuner USB Stick and Mythtv, no problems in Windows!

[Another Sillyname]

Well waddayaknow!!

2 x Hauppauge DVB-TD USB Dual Tuner Sticks.........no decent full locks in
'nix, windows mostly OK.

1 x Hauppauge HVR 2200 PCI-E Dual Tuner Card.....Everything fine, no
problems.

Same wiring setup and antenna.

So I stand by my original supposition/speculation.

Either the driver or the mythtv interfacing to that driver for the DVB-TD
USB Dual Tuner has a problem.

I understand and accept that other people may not be having any problems at
all, but if two devices show identical problems and then a different card
works first time the likelyhood is in software.

Time to work out what I'm going to do from here.




On 13 April 2013 16:12, Roger Siddons <dizygotheca at ntlworld.com> wrote:

> On Fri, 12 Apr 2013 14:39:15 +0100, Stephen Worthington <
> stephen_agent at jsw.gen.nz> wrote:
>
>  On Fri, 12 Apr 2013 13:16:05 +0100, you wrote:
>>
>>  On Thu, 11 Apr 2013 09:39:37 +0100, Another Sillyname
>>> <anothersname at googlemail.com> wrote:
>>>
>>>
>>>> I hope the above makes some kind of sense and would appreciate any
>>>> thoughts or comments people have, I may end up suggesting to him >that
>>>> he may have to just get a better TV antenna on his roof that's raised
>>>> above the blocking building.....
>>>>
>>>>  I had a heap of trouble with the related TD Nova PCI tuner some time
>>> ago
>>> and eventually replaced the aerial and feeds to no avail.
>>>
>>> Maybe I have a duff card but personally I don't rate them, despite their
>>> seemingly good reputation. In my research I noticed a fair few people
>>> complaining of reception problems and susceptibility to EMI.  (even
>>> though
>>> a lot of people also have no trouble). It could be a build quality issue
>>> or they don't cope well in marginal conditions, such as yours.
>>>
>>> I have two suggestions;
>>> 1) Have you tried waving the stick around on a USB cable? I've seen
>>> reports that they work better when they're further away from the TV/PC
>>> components.
>>> 2) Try a different tuner before going to the hassle of replacing the
>>> aerial - after all, you say the TV tuner is happy. In desperation I
>>> picked
>>> up a cheap USB tuner to compare & contrast my 'signal reception problem'
>>> and that one worked perfectly!
>>>
>>
>> As it is a dual tuner, it will need to split the aerial signal to feed
>> it to both tuners.  A splitter typically causes around 6 dB of signal
>> loss.  So that means that any dual tuner will be that much less
>> sensitive than a single tuner.  Putting a dual tuner in a system with
>> other tuners means that you have to have an external splitter, then
>> the internal splitter inside the dual tuner - two lots of signal loss.
>> So if you want the best sensitivity and more than two tuners, you do
>> not want to use a dual tuner - use an external 3+ way splitter for
>> your 3+ tuners, and get only one level of signal loss.  If all you
>> need is two tuners, a dual tuner is fine.  Or you can do what I had to
>> - use an aerial amplifier/splitter and get signal levels that are way
>> above the levels where problems will occur for any tuner.
>>
>
> Good points and I don't disagree.
>
> However I fear I've misled you - my 'cheap USB' was also a dual tuner so I
> was comparing like with like.
>
> When diagnosing reception issues the first step is to remove all extras,
> splitters etc. and I believe the OP is aware of this. Interestingly my duff
> tuner showed no improvement from amps/attenuators/direct feeds etc and my
> cheap one is unaffected by extra splitters.
>
> As Gary states it is difficult to get meaningful numbers from tuners for
> comparison - it's usually a case of trial and error and YMMV. My mistake
> (and my point to the OP) was that, because I was adamant I had a good
> tuner, I wasted a lot of time and effort checking every other component of
> my system. I should have tried a different tuner at the outset.
>
> And FYI some of the UK's 5 muxes are mainly shopping channels! I find that
> a single dual tuner (with multi-rec) is perfectly adequate for us. Even the
> occasional clash is of no consequence as the programmes are repeated so
> often!
>
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