[mythtv-users] Hauppauge WinTV-quadHD TV Tuner Card 1609 and Pixelation
dheitmueller at kernellabs.com
Sun Feb 17 23:01:54 UTC 2019
On Sun, Feb 17, 2019 at 4:26 AM Stephen Worthington
<stephen_agent at jsw.gen.nz> wrote:
> 5) More recently, there have been some new tuner devices which have
> only one input but somehow feed that to each of their tuners in a way
> that gives them all effectively the same signal level. I have no idea
> how this is done, but I have two tuners that work like that, my
> TBS6909 8 tuner DVB-S2 card and my TBS6209 8 tuner DVB-T2 card. These
> are rare and seem to only be cards with greater than 4 tuners. But
> they work well.
It's typically done with an onboard splitter and integrated LNA.
Because it's part of the PCB design, you can build it with much
tighter tolerances and better calibrate the path to minimize loss, as
opposed to an external amplifier where you have no idea how much cable
will be on the outputs.
In general, a professional RF engineer with a spectrum analyzer who
can optimize the PCB design/layout is going to do a better job at
implementing a splitter and amplifier than the typical user splitting
the signal him/herself in front of the tuners.
Devin J. Heitmueller - Kernel Labs
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