![](https://www.seanfoley.blog/wp-content/uploads/2021/05/flightware-filter-testing-1024x768.jpg)
![flightware ADS-B Dual 978 MHz + 1090 MHz Band-Pass SMA Filter](https://www.seanfoley.blog/wp-content/uploads/2021/05/flight-aware-filter-spectrum-results.png)
I plan to build an ADS-B tracker. However, I live in an RF noisy urban neighborhood, and all that noise can desense an RF receiver, so I bought this FlightAware Dual UAT+ADS-B filter. I put it on the spectrum analyzer and I measured a passband from ~930Mhz to ~1.2Ghz with ~1.5dB of insertion loss. Since this is all up in the gighertz range, my plan is to keep the antenna feedlines short by mounting a raspberry pi 4 in a weather-rated enclosure close to the antenna. I’ll power all of it by running a network cable with POE to the raspberry pi with a POE hat.