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<div class="moz-cite-prefix">On 2/28/24 20:15, DryHeat122 wrote:<br>
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cite="mid:CAM=qwAHcW0WOCgbmxP-5CeEuj=TigoF5foFWdMf+7CZeMJCn_w@mail.gmail.com">
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<div dir="ltr" class="gmail_attr">On Wed, Feb 28, 2024, 9:00
PM Gary Buhrmaster <<a
href="mailto:gary.buhrmaster@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">gary.buhrmaster@gmail.com</a>>
wrote:<br>
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<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On
Thu, Feb 29, 2024 at 3:37 AM DryHeat122 <<a
href="mailto:dryheat122@gmail.com" target="_blank"
rel="noreferrer" moz-do-not-send="true"
class="moz-txt-link-freetext">dryheat122@gmail.com</a>>
wrote:<br>
><br>
> I have a HDHR Duo. For one station (Channel 12), the
HDHR app can tune it just fine. When I try to "watch this
channel" on Myth via Program Guide, "signal" (IDK if that
is strength or quality) dithers between 56% & 59% and
it can't get a lock. Recordings on that channel also fail.<br>
><br>
> What could explain this? Every other channel works
fine. I am only 9 mi as the crow flies from the mountain
where all the stations broadcast. Rabbitears.com lists
the signal as good. If the app can lock the signal
accessing through the device then Myth accessing through
the device should able to also, no?<br>
<br>
Yes, but. If the signal is "too strong", the HDHR's<br>
can overload their frontend(*) and the decoding<br>
can fail. And if you do not have an LTE filter, one<br>
can find that the local (600Mhz) LTE signal<br>
from one or more of the local mobile providers<br>
results in overloads on the front end. And,<br>
lastly, sometimes too strong a signal can<br>
overload the frontend too, which can require<br>
a pad(**), although if your other channels<br>
are (deep) fringe may require a channel<br>
specific pad (which is available, but typically<br>
not cheap).<br>
<br>
<br>
(*) RF frontend is a well understood term<br>
in EE and RF physics.<br>
<br>
(**) aka attenuator<br>
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<div dir="auto">It seems like if the first two were the case,
the HDHR app wouldn't be able to tune the channel either, but
it can. As for too strong a signal overloading Myth, channels
with higher signal strength according to the <a
href="http://rabbitears.com" moz-do-not-send="true">rabbitears.com</a>
report get locked by Myth just fine.</div>
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</pre>
</blockquote>
<p>I presume that by "HDHR app" you mean "HDHomeRun Config" on your
linux computer? If so, you can run that in parallel with mythTV
and see signal strength, signal quality, and symbol quality as
mythTV is using that channel. You can also tell which tuner in the
tuner box MythTV is using by looking at which one is tuned to the
channel that MythTV is tuned to.<br>
</p>
<p>It is not clear to me which HDHR you are using, there were
several versions with two inputs. The very first one had two
independent inputs, one for each tuner. If only one is connected
and MythTV is choosing the wrong one, the signal strength would be
very bad.</p>
<p>It used to be that each input on those early tuners could be
programmed separately on MythTV, but since later HDHomeRun tuners
only have a single input, mythTV treats all of the tuners in a
HDHR box as identical (even though the 4K box has two ATSC 3.0
tuners and two ATSC 1.0 tuners). If you have one of the early
HDHomeRun tuners with two inputs, you must put a splitter in front
of it so both tuners see the same signal.</p>
<p>Another worry is that FM signals are much stronger than TV
signals, and can saturate the input of the tuner or any pre-amp
you have on your antenna. You might need an FM trap. There are two
types of FM trap, and they seldom say what type they are. One will
kill all FM, but will also kill channel 6, the other will keep
channel 6 but only kills the lower frequency FM signals. Which one
you want depends on if there is a signal on channel 6 that you
care about. The easiest way to tell them apart is with a spectrum
analyzer. Spectrum analyzers used to be very expensive, but
recently they have gotten much cheaper. This one would probably be
adequate:
<a class="moz-txt-link-freetext" href="https://www.amazon.com/Portable-tinySA-Spectrum-Analyzer-Touchscreen/dp/B08H1S2SYR/ref=sr_1_2?crid=1XSBPWL2CWZS7&dib=eyJ2IjoiMSJ9.E2AAv7H7z2PGLOgyJTAO-lBDmuwuTT8_tR5Idv_aruCipw-410bgkNkSwwv_ClfodGqzCkYgCsPPRyJe9IaRW7oBwvtM3iO8yHWrMKZfCTYDNrv94v4jspDSXK2dBYm2bFRGrWLhmWuBtICIUEYVFWOhPGrFRVYLWMt56sKM4sEnl6Riigz-RS8hxevkqmiEp-mjqJeTIcH9Tl6KGcZ9ZdDBPfkVmxE8YJ5k4U20MHg.R6fUEd8L53gDWBKiF013trLV6zVZyfQ39wFUmwN8YDc&dib_tag=se&keywords=spectrum+analyzer&qid=1709184412&sprefix=spectrum+%2Caps%2C151&sr=8-2">https://www.amazon.com/Portable-tinySA-Spectrum-Analyzer-Touchscreen/dp/B08H1S2SYR/ref=sr_1_2?crid=1XSBPWL2CWZS7&dib=eyJ2IjoiMSJ9.E2AAv7H7z2PGLOgyJTAO-lBDmuwuTT8_tR5Idv_aruCipw-410bgkNkSwwv_ClfodGqzCkYgCsPPRyJe9IaRW7oBwvtM3iO8yHWrMKZfCTYDNrv94v4jspDSXK2dBYm2bFRGrWLhmWuBtICIUEYVFWOhPGrFRVYLWMt56sKM4sEnl6Riigz-RS8hxevkqmiEp-mjqJeTIcH9Tl6KGcZ9ZdDBPfkVmxE8YJ5k4U20MHg.R6fUEd8L53gDWBKiF013trLV6zVZyfQ39wFUmwN8YDc&dib_tag=se&keywords=spectrum+analyzer&qid=1709184412&sprefix=spectrum+%2Caps%2C151&sr=8-2</a></p>
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