My new ADS-B decoding system consumes less than 1W and costs under US$25. It runs standalone, handling everything from reception to feeding adsb.lol.
The hardware: RP2350 (Pico 2) + W5500 for Ethernet + Core2021-HF 'LoRa' module + NEO-7M.
The Core2021-HF is a LoRa module that also handles ADS-B demodulation entirely in hardware. The NEO-7M is a u-blox GPS module.
Power and data travel over a single Cat 6 cable, using an Adafruit passive PoE injector and extractor.
We recommend feeding clean 'linearly-generated' DC power into the passive PoE injector. Otherwise, feeding noisy SMPS-generated power to a long Cat 6 cable (think antenna!) is likely to cause EMI problems!
It even can boot over the LAN, PXE style, for easier firmware development and debugging.
The 'range' is around 122 kms even from a non-optimal location. It even works indoors when planes are nearby ;)
Currently, it is connected to a rubber ducky antenna tuned to 868 MHz but it still manages to perform decently.
Yes, it does MLAT too! :=)
Quick PoC build:
