🛰️ Free Satellite Downlink SpecsNORAD #33591 · WEATHER
NOAA-15/18/19 (APT Decommissioned) → NOAA-20/21 Guide
Reference guide on the June–August 2025 official retirement of legacy NOAA 137 MHz APT and transition to active METEOR-M N2-4 & NOAA-20/21.
Frequency
구 137.1 MHz APT (2025.08 공식 퇴역) → 7812 MHz HRD / NASA GIBS
Modulation: JPSS VIIRS HRD (NOAA-20/21) & 레거시 APT 아카이브
Orbit Altitude / Inclination
850 km / 98.7°
📡 Free Reception Guide
⚠️ [2026 Advisory] Legacy NOAA-15/18/19 137 MHz APT transmissions were officially decommissioned in Jun–Aug 2025. For free 137 MHz VHF reception today, tune to METEOR-M N2-4 (137.9 MHz LRPT), or view live NOAA-20/21 VIIRS imagery via NASA GIBS.
NORAD Two-Line Element (TLE SGP4 Orbital Parameters)
1 33591U 09005A 26289.55000000 .00000120 00000-0 92000-4 0 9998
2 33591 98.7120 310.1200 0014200 112.4000 247.8500 14.12501200912045
🛠️ Recommended SDR Receiver Hardware & Decoding Stack
For VHF LEO satellites (137.9 MHz METEOR-M N2-4 LRPT & 145.8 MHz ISS), use a 120° V-Dipole or QFH circularly polarized antenna with an RTL-SDR V4 dongle and SatDump software.