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Message: <blockquote data-quote="bema" data-source="post: 934189" data-attributes="member: 366229">I bought two Invacom QTH-031 last year but both didn't catch any UK beam transponder so I couldn't compare the isolation. The NF was "crap" compared to BU or maybe it was my dish that was not compatible with Invacom LNB. At the same time bought five BU all better than QTH-031 at least from the sensitivity point of view. I selected the best one and modified the vertical low noise amplifier and got it slightly better, approx 0.5 dB. The horizontal  amplifier is still better so  I turned it 90 degrees and use it for the vertical transponders (HD channels).Even if the isolation is good from the beginning, leakage can occur later i the chain since the gain is very high etc...</blockquote>