IU4FJI — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving IU4FJI, decoded by SO8OO in southeastern Poland. 110 FT8 messages attributed to this token as transmitter, on 160m, 60m, 40m, 20m, 10m, across 4 UTC dates in the available aggregate history. Observed between 2026-08-27 and 2026-09-17.
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 110 FT8 messages attributed to IU4FJI as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (65%), followed by 60 m (21%) and 10 m (8%). Several six-hour UTC windows tied for the largest share (86%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (89%); the estimated median was -3 dB.
Overview
Bands
Last attributed message: 2026-09-17 18:40 UTC
Observed FT8 message patterns
- Attributed sample
- 110 messages
- Active dates
- 4 UTC dates
- Estimated median S/N
- -3 dB
- Estimated 10th-90th percentile
- -9 to +1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 10, strong (≥ -8 dB) 98.
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 IU4FJI in decoded directed-looking exchanges:
Attributed messages by UTC hour
Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.
Most frequent locator attributed to IU4FJI
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
- JN54 · 82 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,013 km (approx.)
- Last such locator decoded
- 2026-09-17 18:39 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 | IU4FJI S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-17 18:38 | 60m | -3 / -15 | 4Z5NN | -20 / -16 | 7 | ✓ Full exchange observed |
| 09-17 18:37 | 60m | -9 / +2 | DK1XAM | -6 / +2 | 4 | ✓ Full exchange observed |
| 09-17 18:35 | 60m | -8 / - | YO3HEY | - / - | 2 | Partial capture |
| 09-17 18:33 | 60m | -8 / -2 | US2YW | +3 / +6 | 5 | ✓ Full exchange observed |
| 09-17 18:32 | 60m | -4 / +6 | OI5AY | +4 / -14 | 4 | ✓ Full exchange observed |
| 09-17 18:30 | 60m | -4 / +5 | GE7RTI | -12 / -6 | 5 | ✓ Full exchange observed |
| 09-17 18:27 | 60m | -2 / -3 | EA1IOK | -6 / -14 | 5 | ✓ Full exchange observed |
| 09-17 18:27 | 60m | -3 / +9 | ON7GB | -3 / -1 | 7 | ✓ Full exchange observed |
| 09-04 19:24 | 40m | -3 / - | RI1FJL | - / - | 5 | Partial capture |
| 09-04 19:22 | 40m | -5 / - | IU5HIU | - / -3 | 2 | ✓ Closing fragment |
| 09-04 19:05 | 40m | -2 / - | RI1FJL | - / - | 29 | Partial capture |
| 09-04 18:44 | 40m | -4 / - | RI1FJL | - / -8 | 16 | Partial capture |
| 09-04 18:43 | 40m | - / - | SP6FME | +6 / - | 2 | Partial capture |
| 09-04 18:41 | 40m | 0 / -2 | OE6TNO | 0 / +4 | 4 | ✓ Full exchange observed |
| 09-04 18:32 | 40m | 0 / - | RI1FJL | - / - | 12 | Partial capture |
| 09-01 18:46 | 40m | -12 / - | IZ8PPI | - / -8 | 2 | Partial capture |
| 09-01 05:14 | 60m | -10 / - | VE2LBI | - / - | 2 | Partial capture |
| 08-27 10:23 | 10m | -6 / - | 5W1SA | - / - | 2 | Partial capture |
| 08-27 09:47 | 10m | -3 / - | 5W1SA | - / - | 7 | Partial capture |
| 08-27 06:49 | 20m | +6 / - | RI1FJL | - / -10 | 4 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 183415 -10 2114 US2YW IU4FJI RR73 183430 +5 2114 IU4FJI US2YW 73 183515 -10 2113 YO3HEY IU4FJI JN54 (x2) 183700 -8 725 IU4FJI DK1XAM +02 183715 -9 2113 DK1XAM IU4FJI R+02 183730 -4 725 IU4FJI DK1XAM RR73 183745 -9 2114 DK1XAM IU4FJI 73 183830 -7 2113 4Z5NN IU4FJI JN54 183845 -18 1533 IU4FJI 4Z5NN -15 183900 -6 2113 4Z5NN IU4FJI JN54 183945 -20 1533 IU4FJI 4Z5NN -13 184000 +2 872 4Z5NN IU4FJI R-16 184015 -21 1533 IU4FJI 4Z5NN RR73 184030 +0 872 4Z5NN IU4FJI 73
UTC dB Audio Message 191815 -5 1408 RI1FJL IU4FJI JN54 (x8) 192215 -5 1408 IU5HIU IU4FJI -03 (x2) 192415 -2 1942 RI1FJL IU4FJI JN54 (x5)
UTC dB Audio Message 182445 -16 1202 CQ IU4FJI JN54 (x2)
UTC dB Audio Message 094745 -4 1915 5W1SA IU4FJI JN54 (x9)
UTC dB Audio Message 064945 +7 1835 RI1FJL IU4FJI JN54 (x4) 091530 +0 2208 IU4FJI 9A5E -15
Decoder S/N history by band
Count-weighted daily averages across messages attributed to this profiled token and successfully decoded at SO8OO, limited to the rolling 90-day UTC chart window.
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee