Hey Edgar,
Sorry for the delayed response. I think I have seen your post on the Comsol forum as well (that forum has helped me a lot too)! Is it possible to make such a filter tunable because the 280 KHz signal varies a little from measurement to measurement? That seems like it would be a problem so I have been looking into the "phasing method" for single sideband modulation.
Does anyone know anything about SSB modulation for these frequency ranges (and using the phasing method since it seems the filtering method won't work very well)? I can understand the math, but I haven't been able to see anything about practical implementation for SSB modulation (like where to buy the hardware and/or how to build something like this).
-Eric