Can't hear users very well on AO-51 LU Mode. U band downlink exhibits good quieting of squelch with some QSB. For downlink I'm using an M2 436CP30 polarized yagi with SSB SP7000 pre-amp. I might have heard a whisper of somebody today during a high pass over California. Maybe if I had a polarity switch I could hear better. de Ron n6paa

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