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<p style="margin-bottom: 0in; line-height: 100%">Hi Stephen!</p>
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<pre class="western" style="margin-left: 0.49in">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. </pre>
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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.)</p>
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<pre class="western" style="margin-left: 0.49in">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.</pre>
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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.</p>
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<p style="margin-bottom: 0in; line-height: 100%">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.</p>
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<p style="margin-bottom: 0in; line-height: 100%">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. </p>
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<p style="margin-bottom: 0in; line-height: 100%">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
results. </p>
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<p style="margin-bottom: 0in; line-height: 100%">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.</p>
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<p style="margin-bottom: 0in; line-height: 100%">Barry</p>
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