[mythtv-users] Hauppauge WinTV-quadHD TV Tuner Card 1609 and Pixelation
barry3martin at gmail.com
Sun Feb 17 17:55:25 UTC 2019
If your pixellation is caused by low signal levels, then you will need
to tell us just what your aerial system is like in order to work out
what would be a good solution. A lot of people get bitten by not
understanding how to set up an aerial system. Some basics that you
may or may not already know:
1) The quality of the aerial signal can not be improved by anything
you do after the aerial itself.
Thanks for the in-depth review of reception. I do have some background
in hobby electronics and aware of signal loss in coax, splitters, etc. I
will admit a lot of my potential solutions thus far here were by
educated guessing. (I hope this reply isn’t coming off wrong – I do
appreciate the guidance.)
7) If you have signal level problems, then separate tuners may be a
better option. If you have a TV and two separate tuners, you can use
a three-way splitter, so each of them gets one third of the available
signal. If you use a TV and a dual tuner device, you have to use a
two way splitter, giving the TV half the signal, and each of the dual
tuners will then only be getting one quarter of the signal.
Agree. One major detail I left out is I have three antennae here. Bad
news is they’re in the attic (signal loss of asphalt roof), good news is
it keeps peace in the family. I did test an outdoor antenna and no
significant improvement in reception. Back the the antennae, one is for
the televisions, one each for the two Backends. The original single
antenna to feed the TVs and the original one Backend did cause issues
with too much signal for one feed and/or not enough for the other feed.
The TV feed. (Live, OTA; separate from MythTV Backends.) Have noticed
different televisions ‘react’ differently. The older TVs are more prone
to displaying pixellation, an interrupted picture (and sound) where the
newer TVs will have little to no interruption. All TVs are LED, coax
homerunned to a splitter in the basement. Have also tested a couple of
the runs by temporarily running RG-6/U from the splitter to the
televisions with pixelation issues – again no change to that set.
Conclusion is the particular tuner.
The MythTV / Backend feed. (Separate from the TV feed.) Actually is two
Backends with their own antenna, so duplicates. Reasoning was the new BE
to replace the old BE. Sometimes BE1 will record fine while BE2 has
issues, sometimes BE2 is fine/better than BE1. Both have HVR-1600 and
HVR-2250 tuners installed. Yes, the 1600 is a single digital tuner and
the 2250 is a dual digital tuner, so the 2250 probably has that 3 dB
drop. Doesn’t appear to make any difference.
The constant here with signal drops (pixelation) is when it is windy.
Antennae are in the attic, so eliminated movement of the antenna itself
as well as the coax. The dropouts will affect the TV Feed and the
Backend feeds, physically separate from each other. For the TVs does
make a difference as to which TV; for the Backends somewhat the same
Hopefully I’m not coming across as a smarty-pants, just literally years
of experimentation with this system. At this point it seems the problem
is more with how the tuner reacts to the varying signal when windy (yes,
we can predict bad recordings), so hopefully a newer generation of tuner
such as the 1609 will alleviate some of the problem. Your advice on
delivering the signal to the tuner is very much appreciated.
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