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is there any rule of thumb to know when trying to get a station if its worth trying a bit more or if a co-channel is just going to knock it off the air.
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Off the top of my head, it's around 35 dB
at the input to the tuner. for adjacent channels [emphasis added, the factors Tim mentioned come into play for this] This also presumes you are not generating either IMD or harmonics in the receiving system before the tuner that fall into the weaker channel's bandwidth lowering its SNR. For co-channels, I'd have to look it up.
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or is this pretty much factored into the results page
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It is not factored in at all.
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anytime there is a C you are going to get knocked off
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No, you have to manage the co-and adjacent signal forecasts separately and manually.