https://www.pistack.xyz/tags/signal-processing/ Recent content in Signal-Processing on Pi Stack Hugo en-us Sat, 06 Jun 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-06-06-self-hosted-amateur-satellite-ground-stations-satdump-goestools-noaa-apt/ Sat, 06 Jun 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-06-06-self-hosted-amateur-satellite-ground-stations-satdump-goestools-noaa-apt/ <h2 id="introduction">Introduction</h2> <p>Amateur satellite reception is one of the most rewarding niches in the software-defined radio (SDR) hobby. With a $30 RTL-SDR dongle and a simple antenna, you can receive real-time weather imagery directly from NOAA, Meteor, and GOES satellites orbiting hundreds of kilometers above Earth. The challenge isn&rsquo;t the hardware — it&rsquo;s the software that demodulates, decodes, and renders the raw radio signals into beautiful Earth images.</p> https://www.pistack.xyz/posts/2026-06-06-self-hosted-digital-voice-decoding-dsd-fme-op25-sdrtrunk-guide/ Sat, 06 Jun 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-06-06-self-hosted-digital-voice-decoding-dsd-fme-op25-sdrtrunk-guide/ <h2 id="introduction">Introduction</h2> <p>Digital voice has transformed land mobile radio. Public safety agencies, transit systems, utilities, and amateur radio operators have migrated from analog FM to digital protocols like P25 (Phase 1 and 2), DMR (Digital Mobile Radio), NXDN, and TETRA. For radio hobbyists, researchers, and interoperability developers, decoding these digital voice streams requires specialized software that can demodulate the complex digital modulation schemes and reconstruct intelligible audio.</p>