https://gnosis.farm/blog/sdr/ Recent content in SDR on gnosis.farm Hugo -- gohugo.io en-us Sat, 23 May 2026 21:00:01 +0200 https://gnosis.farm/receiving-and-decoding-astrid-messages/ Sat, 23 May 2026 21:00:01 +0200 https://gnosis.farm/receiving-and-decoding-astrid-messages/ The Belgian ASTRID network is a pager system for emergency services, like ambulances and firefighters, to get notified when their assistance is required somewhere. This network uses the POCSAG protocol and is unencrypted, so anyone in Belgium or close to the borders can receive all messages and decode them. There was once even a website called cpabreda.nl that recorded all messages and grouped them for each part of the country. Unfortunatly they had to shut down their website.