Solid out of band rejection, and I suspect around -100 dB ultimate rejection. It’s a straightforward cavity filter, a little aluminum brick with fine performance. The black square in the center of the image is the 1090 MHz filter, and it’s a quite good one. So, I drafted up what I thought would be a reasonable spec and went into Alibaba to find a filter manufacturer to build one. I ended up with 5 filters, all exactly to my spec, and for a bargain price (well, relatively speaking).Ībove is the finished ADS-B receiver assembly, complete with Raspberry Pi, RTL-SDR 1ppm TCXO SDR dongle, a eBay-purchased LNA, an eBay-purchased 12 vdc to 5 vdc DC-DC converter, and some coaxial cabling (also from eBay). Not that I had an immediate need, I didn’t have anything on a mountaintop, but I suppose I had a little extra cash and felt excited to be able to imagine a good ADS-B receive site atop an Arizona mountaintop (or hilltop) location. Over a year ago I decided that I needed some good filters for ADS-B reception on mountaintops.
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