IU8RTJ — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving IU8RTJ, decoded by SO8OO in southeastern Poland. 58 FT8 messages attributed to this token as transmitter, on 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-06-14 and 2026-08-30.
These are automated observations at the SO8OO receiver, not an official contact log. Times are UTC. Attribution follows decoded FT8 message structure: CQ uses the first token and directed-looking messages use the second. Free text that resembles a directed message can be attributed imperfectly. Summary S/N reflects propagation plus SO8OO receiver, antenna and local-noise conditions. Counts are not adjusted for monitoring outages; transmissions that were not decoded are absent. Inferred entity and location data may be inaccurate for portable, remote or special-event operation.
SO8OO decoded 58 FT8 messages attributed to IU8RTJ as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (95%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8 dB.
Overview
Observed FT8 message patterns
- Attributed sample
- 58 messages
- Active dates
- 6 UTC dates
- Estimated median S/N
- -8 dB
- Estimated 10th-90th percentile
- -19 to +3 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 8, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 31.
WSJT-X defines S/N reports against a 2,500 Hz reference noise bandwidth. The ranges above are SO8OO receiver-side display categories, not official WSJT-X classes, transmitter-power measurements or estimates of how easy the station is to hear elsewhere. Statistics include only successful decodes on SO8OO's monitored FT8 channels; transmissions that were not decoded are absent.
Frequent counterpart tokens observed at SO8OO
Tokens most often paired with IU8RTJ in decoded directed-looking exchanges:
Most frequent locator attributed to IU8RTJ
The map compares the centres and boundaries of the locator field attributed to this token by decoded message structure, 2° × 1° as a Maidenhead square, and SO8OO's six-character receiver square. The separation is not an exact antenna-to-antenna distance or a radio-path length.
- Attributed locator
- JN70 · 55 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,175 km (approx.)
- Last such locator decoded
- 2026-08-30 21:10 UTC
A decoded locator can describe portable, remote or special-event operation and is not proof of a permanent station address or transmitter identity.
Observed FT8 exchanges
S/N cells show: decoded at SO8OO / report transmitted by the counterpart. An observed exchange is not a QSL or an official logbook confirmation.
| Time UTC | Band | IU8RTJ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-16 21:06 | 40m | - / -12 | 7Z1BQ | -18 / - | 2 | Partial capture |
| 09-16 20:54 | 40m | - / -25 | UA9JTJ/9 | -6 / - | 2 | Partial capture |
| 08-30 20:56 | 20m | -24 / -14 | PP5HR | -20 / -5 | 4 | ✓ Full exchange observed |
| 08-25 15:21 | 20m | - / -15 | TF1A | -4 / - | 2 | ✓ Closing fragment |
| 08-25 15:05 | 20m | - / -18 | RA9LL | +7 / - | 3 | ✓ Closing fragment |
| 08-05 10:35 | 20m | - / -20 | CR5VP | -22 / - | 2 | Partial capture |
| 07-17 21:32 | 20m | - / -16 | KF0YOB | -4 / - | 3 | ✓ Closing fragment |
| 07-09 15:36 | 20m | - / - | G8XDD/P | -17 / - | 2 | ✓ Closing fragment |
| 07-02 14:24 | 20m | - / -9 | GU4WRP | -7 / - | 3 | ✓ Closing fragment |
| 07-02 14:15 | 20m | - / -13 | M7JVT | -14 / - | 5 | Partial capture |
| 07-02 14:09 | 20m | - / - | G4YLJ | -17 / - | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 174815 -13 1355 IU8RTJ IU4PPL JN54 205415 -5 1397 IU8RTJ UA9JTJ/9 -25 (x2) 210600 -18 1338 IU8RTJ 7Z1BQ -12 (x2) 141315 -18 983 IU8RTJ IU4PPL R+11
UTC dB Audio Message 103600 -21 1378 IU8RTJ CR5VP -20 075400 -19 2165 IU8RTJ LA8ENA RR73 201945 -18 1772 IU8RTJ EA8AT RR73 150515 +8 2608 IU8RTJ RA9LL -18 (x3) 152145 -2 1165 IU8RTJ TF1A -15 (x2) 205630 -23 1396 PP5HR IU8RTJ JN70 205815 -21 1370 IU8RTJ PP5HR -14 205830 -24 1396 PP5HR IU8RTJ R-05 205845 -20 1370 IU8RTJ PP5HR RR73 210200 -19 1396 KK4PJ IU8RTJ JN70 210400 -22 1396 KF9UG IU8RTJ JN70 (x2)
UTC dB Audio Message 131915 -15 2169 IU8RTJ OO26TRUDO -14
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee