https://www.pistack.xyz/tags/radio-monitoring/ Recent content in Radio-Monitoring on Pi Stack Hugo en-us Sat, 06 Jun 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-06-06-self-hosted-pager-message-monitoring-pagermon-multimon-ng-pdw-guide/ Sat, 06 Jun 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-06-06-self-hosted-pager-message-monitoring-pagermon-multimon-ng-pdw-guide/ <h2 id="introduction">Introduction</h2> <p>Pager networks — once the backbone of emergency communications and hospital messaging — are still actively broadcasting across the world. Using POCSAG (Post Office Code Standardisation Advisory Group) and FLEX protocols, these networks transmit numeric and alphanumeric messages over VHF and UHF frequencies. While commercial paging services have declined, many hospitals, fire departments, and industrial facilities still operate private paging systems — and with a $25 RTL-SDR dongle and open source software, you can monitor these transmissions from your own server.</p>