[mythtvnz] HD HomeRun vs HVR-2200 for DVB-T?

[Paulgir]

On Sun, 08 Sep 2013 13:41:27 +1200, Stephen Worthington  
<stephen_agent at jsw.gen.nz> wrote:

> On Sun, 08 Sep 2013 08:00:43 +1200, you wrote:
>
>> On Sat, 07 Sep 2013 23:35:16 +1200, Steven Ellis  
>> <steven at openmedia.co.nz>
>> wrote:
>>
>>> Has anyone here done a comparison on the two devices when dealing with
>>> marginal signal issues.
>>>
>>> My TVNZ and Mediaworks reception is OK but Kordia is a bit marginal on  
>>> my
>>> HVR-2200, but fine on my Samsung TV.
>>>
>>> Steve
>>>
>> I'm in a fringe area (50km from the transmitter,no line of sight) and
>> experience occasional pixellation during rain and high winds (mainly due
>> to nearby tree movement).
>> Both the HVR-2200 and HDHR are about the same for this and about 80% as
>> stable as my Panasonic TV.
>>
>> Paul
>
> Does your HDHR have dual tuners?  If so, then like the HVR-2200, the
> internal splitter will be dropping the signal level compared to the
> direct feed to the TV's single tuner.  The signal levels at all tuners
> in multi-tuner devices will always be lower than in single tuner
> devices due to that problem.  So you will always get better signal
> levels at the tuners if you have one external multiway splitter that
> feeds your TV and multiple single tuners than if you have a dual
> splitter that feeds one leg to the TV and the other leg to a dual
> tuner.  The leg going to the TV is not split.  The leg going to the
> dual tuners gets the same signal level as the leg to the TV, but is
> then split in half.  This is a fundamental problem with using multiple
> tuner devices that catches people all the time - they say their TV has
> a better tuner, when the tuners themselves are not to blame, it is
> just the level of signal that is getting to them is different.
>
> Which is not to say that there are not tuners out there with different
> sensitivities - there are.  But the tuners in TVs almost certainly use
> the same chips as the ones in PC tuners - TVs do not have inherently
> better tuners.  But all the time there are people posting about
> problems where their dual tuner is not picking up the weakest signals
> and their TV is, and it is usually just the geometry of the signal
> splitting that is causing the problem.  Feed a tuner less than half
> the signal level and it will perform worse.
>
> The reason why the Kordia multiplex is the one that usually has
> problems is that it is normally the highest frequency multiplex.  Any
> fixed aerial system working over a range of frequencies is always
> going to perform best at a certain part of that range, with the
> performance declining as the frequency of the signal is further away
> from that best frequency.  Kordia, at its higher frequency, is usually
> the multiplex that is further away from the best frequency and
> therefore gets the least signal at the tuners.
>
Good explanation.Yes the HDHR is dual tuner.
I must take an axe to that remaining tree in my signal path.

Paul