We've been fooling around at work with different brands of charge controllers hoping to find something that is "quiet" enough to use at radio sites. We recently bought an Outback Flexmax 80 and a Morningstar Tristar 60A and compared them, both running at about 55A. We looked at the VHF lowband (6 meters to hams) and highband (2 meters) spectrum since that's what we mainly use and where we usually get RFI. I was surprised at te difference and thought other hams might be interested. Usually we use simple on/off controllers for RF quiet-ness, but I've been wanting to try MPPT. Here are some spectrum analyzer plots taken from dipole antennas about 25 feet above the working system.
Anyway I thought others might be interested, and if you have ideas for other brands I should try, I'm all ears.
solar test 1.jpgOutback_HB_812W_30ftVert_10ftHorz.GIFOutback_LB_40-41MHz_Zoomed.GIFTristar_LB_775W_30ftVert_10ftHorz.GIFTristart_HB_775W_30ftVert_10ftHorz.GIFOutback_LB_741W_30ftVert_10ftHorz.GIF
Anyway I thought others might be interested, and if you have ideas for other brands I should try, I'm all ears.
solar test 1.jpgOutback_HB_812W_30ftVert_10ftHorz.GIFOutback_LB_40-41MHz_Zoomed.GIFTristar_LB_775W_30ftVert_10ftHorz.GIFTristart_HB_775W_30ftVert_10ftHorz.GIFOutback_LB_741W_30ftVert_10ftHorz.GIF
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