■ ISS TRACKER
International Space Station • G7SYQ • IO93 Lincolnshire • NA1SS / RS0ISS
▶ LIVE TRACKING & PASS PREDICTION◀
☀ RADAR — IO93
● ACQUIRINGAzimuth
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△ 24-HOUR PASS PREDICTIONS
Loading...● CALCULATING PASSES...
📵 AMATEUR RADIO FREQUENCIES — ARISS / NA1SS / RS0ISS
STATUS: MAY 2026| Mode | Direction | Frequency | Notes |
|---|---|---|---|
| FM VOICE REPEATER NA1SS • Columbus lab |
↓ DOWNLINK | 437.800 MHz FM • Doppler ±10 kHz |
CURRENT ACTIVE MODE (May 2026) Kenwood D710GA — Columbus European Lab. No PL tone needed to listen. Uplink on 145.990 with PL 67 Hz. |
| FM VOICE REPEATER | ↑ UPLINK | 145.990 MHz FM • PL Tone 67.0 Hz required |
Transmit here to access the Columbus repeater. PL tone 67.0 Hz must be enabled. Max power needed from IO93 — use a beam. |
| FM VOICE DIRECT ITU Region 1 — Europe/UK |
↓ DOWNLINK | 145.800 MHz FM • Doppler ±3.5 kHz |
Worldwide downlink for voice and SSTV. Used when crew are doing direct QSOs. Never transmit on 145.800 — listen only unless called by crew. |
| FM VOICE DIRECT | ↑ UPLINK | 145.200 MHz FM • Region 1 (Europe/Africa) |
Uplink for ITU Region 1. Crew listen here while transmitting on 145.800. No PL tone. Keep transmissions short — pass duration is only ~10 minutes max. |
| APRS / PACKET AX.25 1200 Bd AFSK • RS0ISS |
↕ SIMPLEX | 145.825 MHz FM • Worldwide |
APRS digipeater on RS0ISS (Zvezda module). Path: ARISS. Works with basic 2m FM radio + TNC or Direwolf software TNC. Currently also active on 437.825 MHz. |
| APRS / PACKET RS0ISS • Zvezda |
↕ SIMPLEX | 437.825 MHz FM • Active May 2026 |
UHF APRS from Zvezda module. Currently active (May 2026 ARISS status). Use with UHF beam for best results from IO93. |
| UHF SIMPLEX Rarely used |
↕ SIMPLEX | 437.550 MHz FM |
UHF simplex, rarely used for voice. Also used for some SSTV events. See SSTV section below. |
| HAM TV Columbus lab • DVB-S |
↓ DOWNLINK | 2395.00 MHz DVB-S • Needs dish |
Video downlink from Columbus module. Requires a 60cm+ satellite dish with modified LNB. Transmitting test signal as of May 2026. Visit live.ariss.org/hamtv |
△ DOPPLER SHIFT GUIDE — IO93 LINCOLNSHIRE
| Frequency | Approaching (Max shift) | Overhead | Departing (Max shift) | Tip |
|---|---|---|---|---|
| 145.800 MHz | +3.4 kHz → 145.8034 | 145.800 MHz | −3.4 kHz → 145.7966 | Leave radio on 145.800 — works for most passes |
| 437.800 MHz | +10.1 kHz → 437.810 | 437.800 MHz | −10.1 kHz → 437.790 | Start high, tune down through pass |
| 145.825 MHz | +3.5 kHz → 145.8285 | 145.825 MHz | −3.5 kHz → 145.8215 | APRS software usually auto-corrects |
📷 SLOW SCAN TELEVISION (SSTV) — ARISS
ARISS PROGRAMPRIMARY SSTV DOWNLINK
145.800 MHz
FM • PD120 or Robot 36 mode
Primary frequency for ARISS SSTV events.
Mode varies by event — PD120 is most common recently.
Older events used Robot 36.
2-minute gap between each image transmission.
Mode varies by event — PD120 is most common recently.
Older events used Robot 36.
2-minute gap between each image transmission.
SECONDARY SSTV (UHF)
437.550 MHz
FM • Robot 36 mode • 10W
Used for some dedicated SSTV events (e.g. April 2026 event).
Robot 36 mode at 10W transmit power.
Requires UHF antenna — beam recommended.
Doppler: ±10 kHz across pass.
Robot 36 mode at 10W transmit power.
Requires UHF antenna — beam recommended.
Doppler: ±10 kHz across pass.
RECENT SSTV EVENTS
Apr 2026: Series 31 — 437.550 MHz Robot 36. Cosmonauts Day / Gagarin 65th anniversary. Apr 10–14.
May 2026: Event May 8–9, 10:30 UTC start, 145.800 MHz.
SSTV Gallery site: Currently offline. Check ariss.org for next event dates.
May 2026: Event May 8–9, 10:30 UTC start, 145.800 MHz.
SSTV Gallery site: Currently offline. Check ariss.org for next event dates.
How to receive SSTV from IO93:
Tune to 145.800 (or 437.550) FM on your radio. Connect audio output to a PC running
MMSSTV (Windows) or QSSTV (Linux/Pi).
Software decodes automatically. No special hardware needed — an RTL-SDR dongle works well.
Doppler shift is gradual on 145 MHz; for 437 MHz, start tuned 10 kHz high and tune down during the pass.
Each image takes ~2 minutes to decode. You only need a few seconds of the pass directly overhead for a full image.
Submit received images at ariss-sstv.blogspot.com to claim an ARISS certificate.
⚙ SETUP & TROUBLESHOOTING
Pass predictions require Python 3 with ephem on the Pi web server.
Install:
Observer location is set to IO93 — Lincolnshire (53.2333°N, 0.5300°W, 20m ASL).
To adjust, edit
Pass results are cached for 5 minutes in
Install:
pip3 install ephem or sudo apt install python3-ephemObserver location is set to IO93 — Lincolnshire (53.2333°N, 0.5300°W, 20m ASL).
To adjust, edit
OBS_LAT / OBS_LON / OBS_ALT constants in api.php.Pass results are cached for 5 minutes in
iss/cache/passes.json — ensure Apache can write to that directory.sudo chown www-data:www-data /var/www/html/iss/cache