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Sorry, it's taken me so long to respond.
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No problem; it takes time to do it right. And it's going to take time for us to digest your results and think of an intelligent helpful comment.
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I am not sure what the difference is between "Signal Strength" and "Signal Qualtiy" as called out on my LG 42LD550 TV.
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Every manufacturer does it a little differently. The percent scale is only relative, not absolute, but it is very useful for comparisons. The signal strength is similar to the NM dB or Signal pwr dBm scales on your tvfool report. The Signal Quality is probably SNR (Signal to Noise Ratio).
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Also, can you confirm that "front" and "back" of antenna is as I think in the picture below?
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Your labels are correct.
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Also, the weird thing to me is that is that the main channels that I want to get on the 1st Floor TV, but only get on the 2nd Floor TV (WSOC-TV, WTVI-HD, WTVI-MV, WTVI-Ct) all have "Signal Strengths" on the 2nd Floor TV of 89% or higher. In fact, there are stations that I got on both TVs, for which the signal strength on the 2nd Floor TV is lower than 89%. Doesn't really make any sense to me.
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It doesn't make sense yet to me either.
There are three possibilities. The loss in the coax line to the first floor is more than estimated. As a test, run a temporary coax line to the 1st floor to bypass the in-wall coax run.
The 1st floor tuner is more sensitive to overload than the tuner in the 2nd floor TV. Try inserting various values of attenuation between the antenna and the input of the 3412. A 2-way splitter has a loss of 3.5 dB, a 4-way 7 dB.
https://www.antennasdirect.com/store...ttenuator.html
http://www.3starinc.com/drop_in-line_attenuator.html
http://mjsales.net/collections/atten...ant=1083705673
•Attenuation values 1, 3, 6, 8, 10, 12, 16, 20dB (FAM)
click on 1 dB for other values; the up and down arrows are faint
The tuner in the 1st floor TV is less sensitive than the tuner in the 2nd floor TV. To test this theory you would need to move the 2nd floor TV down to the 1st floor.
Is it safe for me to assume that you do a tuner rescan of the 1st floor TV after a change?