223
« on: December 16, 2017, 2113 UTC »
OK here's the clean +/- comparison i promised. No smoothing or noise reduction and all the auto-adjustments on the waterfall turned off. The top panel is filter in-line between the H800 and the Afedri, the middle panel is with the filter removed, and the bottom panel is the filter put back. The strong signal you see is 930 kHz. Not shown is the trace on the S-meter; baseline noise went from S2 with the filter on to S5-6 with it off.
So...for $20 bucks you can get some BCB relief. Does it solve all my intermod problems? No...perhaps in part because the BCB filter is working on the amplified signal from the antenna. Turns out the H800 has the preamp IN the antenna probe, and the little box is just the power supply for that.
Next step is to lay out my LOG and try that +/- the filter.