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I just wish I could figure out why I am getting the error messages on ABC-KSPR channels.
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The signal might be too "hot" for the Roamio tuner. A simple test would be to insert a 2-way splitter between the C2V and the input of the AC7, which would attenuate the signals 3.5 dB; two splitters in series or a 4-way splitter would attenuate the signals 7 dB.
If you want some actual fixed attenuators:
http://www.mjsales.net/itemsearch.asp?FamilyID=221
They also have power passing attenuators, but you don't need that kind now.
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I guess we have concluded the 10-1 is due to VHF being more susceptible to interference...
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Yes, electrical interference is greater on VHF. It could also be from multipath reflections coming from other directions because of the simple Vhf antenna. Again from ATSC A/74:
A more directional VHF antenna would reject many of those reflections.
Note from the table that the greater the difference in time between the main signal and the echo (reflection), the weaker the echo must be to not interfere with reception.
How often do you see the uncorrected errors? Once-a-day for a few minutes, or more like almost constantly?
Do you see picture and audio problems on your TV only when you have errors?