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Digital & Satellite
12 entriesCommon digital-mode watering holes (FT8, APRS, Winlink), the ISS, weather satellites and time-standard stations.
| Name / Channel | Frequency (MHz) | Mode / Notes | Details |
|---|---|---|---|
| APRS (North America) | 144.390 | AFSK 1200 | National APRS channel — position beacons, weather stations, messaging. View live at aprs.fi. |
| FT8 | 1.840 · 3.573 · 7.074 · 10.136 · 14.074 · 18.100 · 21.074 · 24.915 · 28.074 · 50.313 | USB | FT8 watering holes by band (dial, USB). The most active mode on HF today — decodable at –20 dB SNR. |
| PSK31 | 14.070 · 7.070 · 3.580 · 21.070 | USB | Classic keyboard-to-keyboard digital mode centers. |
| JS8Call | 7.078 · 14.078 · 3.578 | USB | Conversational/messaging offshoot of FT8; store-and-forward relaying popular with off-grid comms folks. |
| Winlink (VARA/Ardop) | Various per region | USB | Email over radio via RMS gateways. Channel lists ship with Winlink Express; works when the internet doesn't. |
| ISS voice (Region 2) | ↓145.800 ↑144.490 | FM | Talk to (or just hear) the International Space Station. Downlink 145.800 is easy with a handheld when it's overhead. |
| ISS APRS digipeater | 145.825 | AFSK 1200 | Packet digipeater on the ISS — bounce APRS messages off the space station. |
| ISS SSTV events | 145.800 | FM · PD120 | Periodic slow-scan TV image events from the ISS on the voice downlink. |
| SO-50 satellite | ↓436.795 ↑145.850 (67.0 Hz) | FM | Popular FM 'easy sat' workable with a dual-band HT and whip. |
| NOAA APT satellites | 137.100 / 137.9125 (NOAA-19: 137.100) | APT | Free live weather-satellite imagery with an RTL-SDR and a V-dipole. NOAA-15 137.620, NOAA-19 137.100. |
| WWV / WWVH time | 2.5 · 5 · 10 · 15 · 20 · 25 MHz | AM | NIST time stations — atomic-clock time ticks. Also the classic HF propagation check: if you hear WWV, the band's open. |
| CHU Canada time | 3.330 · 7.850 · 14.670 | USB+carrier | Canada's NRC time station. |