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Have you tested reception with no preamplifier parts in the system? (Remove the mast-head amplifier and the power insertion adapter completely.) The levels shown in your report are strong, arguing against the need for any amplifier at all.
If you still have trouble, the symptoms can also be indicating multipath. Multipath can be a problem in both weak and strong signal conditions. The solution may be found in repositioning the antenna (aim and or location).
FWIW, a low SNR is not proof of low signal level, but rather an indication of poor signal quality. Signal power (strength) is only one simple element in the equation...
Last edited by GroundUrMast; 29-Aug-2012 at 7:42 PM.
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