IU0RBF — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving IU0RBF, decoded by SO8OO in southeastern Poland. 52 FT8 messages attributed to this token as transmitter, on 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-09-19 and 2026-09-20.
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 52 FT8 messages attributed to IU0RBF as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (100%). In this small sample, the estimated median decoder S/N was -3 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 52 messages
- Active dates
- 2 UTC dates
- Estimated median S/N
- -3 dB
- Estimated 10th-90th percentile
- -10 to +3 dB
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 10, strong (≥ -8 dB) 42.
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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).
Frequent counterpart tokens observed at SO8OO
Tokens most often paired with IU0RBF in decoded directed-looking exchanges:
Most frequent locator attributed to IU0RBF
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
- JN61 · 42 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,158 km (approx.)
- Last such locator decoded
- 2026-09-20 04:29 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 | IU0RBF S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-20 04:27 | 40m | +4 / - | NO5Z | - / - | 3 | Partial capture |
| 09-20 04:25 | 40m | -2 / - | KR9U | - / - | 2 | Partial capture |
| 09-20 04:24 | 40m | -4 / - | WX7P | - / - | 2 | Partial capture |
| 09-20 04:16 | 40m | +4 / - | W3GO | - / - | 2 | Partial capture |
| 09-20 04:08 | 40m | +2 / - | N1EDF | - / - | 3 | Partial capture |
| 09-20 04:06 | 40m | 0 / - | WA6LTV | - / - | 3 | Partial capture |
| 09-20 04:05 | 40m | -5 / - | KR4DJY | - / - | 3 | Partial capture |
| 09-20 04:03 | 40m | -8 / - | W2JC | - / - | 3 | Partial capture |
| 09-20 04:02 | 40m | - / - | F5PBG | -6 / - | 2 | Partial capture |
| 09-20 04:01 | 40m | -4 / - | SQ9CXH | - / -3 | 2 | ✓ Closing fragment |
| 09-20 03:58 | 40m | -6 / - | W3L | - / -17 | 4 | ✓ Closing fragment |
| 09-20 03:57 | 40m | -6 / - | N1EDF | - / - | 2 | Partial capture |
| 09-20 03:53 | 40m | -6 / - | KA0JWC | - / -18 | 4 | ✓ Closing fragment |
| 09-19 05:05 | 40m | -2 / - | WB3JSZ | - / - | 2 | Partial capture |
| 09-19 05:04 | 40m | -4 / - | KN4KYD | - / - | 3 | Partial capture |
| 09-19 05:00 | 40m | -1 / - | KS1WK | - / -20 | 4 | ✓ Closing fragment |
| 09-19 04:52 | 40m | -7 / - | KO4OIG | - / - | 3 | Partial capture |
| 09-19 04:51 | 40m | -8 / - | KE9END | - / - | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 040800 +6 533 N1EDF IU0RBF JN61 (x3) 041415 -3 2177 WA6LTV IU0RBF JN61 041545 +0 453 K0YEQ IU0RBF JN61 041615 +3 453 W3GO IU0RBF JN61 (x2) 042345 -11 2427 KN4DS IU0RBF JN61 042415 -3 2427 WX7P IU0RBF JN61 (x2) 042545 -1 2320 KR9U IU0RBF JN61 (x2) 042730 +3 2437 NO5Z IU0RBF JN61 (x3)
UTC dB Audio Message 064100 -16 1978 IU0RBF F4UJU -07
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.
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