SDR Archives - Supermikko

L-Band Satellite Signal Exploration with RTL-SDR and Patch Antenna

By Supermikko|2026-03-06T22:36:44+02:00March 6th, 2026|Categories: Frequencies, Radio, Space|Tags: gnss-sdr, gps, Inmarsat, iridium, L-band, raspberry-pi, rtl-sdr, sarsat, satellite, SDR|

Today I spent some time exploring the L-Band spectrum (1500-1700 MHz) using an RTL-SDR dongle connected to an L-Band satellite patch antenna on a Raspberry Pi. The setup is simple but effective for receiving various satellite signals including Inmarsat, Iridium, GPS, and COSPAS-SARSAT search and rescue transponders. Hardware Setup RTL-SDR with [...]

Milstar UHF FHSS Downlink

UHF FHSS Downlink of Milstar, a Unites States joint military service satellite communications system that provides secure, jam resistant, worldwide communications. Milstar (Military Strategic and Tactical Relay) is a constellation of military communications satellites in geosynchronous orbit. Those are operated by the United States Air Force and they provide secure jam-resistant worldwide communications so [...]