IU5RCJ — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving IU5RCJ, decoded by SO8OO in southeastern Poland. 21 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-08-27.
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 21 FT8 messages attributed to IU5RCJ as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -4 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 21 messages
- Active dates
- 1 UTC dates
- Estimated median S/N
- -4 dB
- Estimated 10th-90th percentile
- -14 to +5 dB
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 7, strong (≥ -8 dB) 13.
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 IU5RCJ in decoded directed-looking exchanges:
Most frequent locator attributed to IU5RCJ
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
- JN53 · 3 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,089 km (approx.)
- Last such locator decoded
- 2026-08-27 22:21 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 | IU5RCJ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-27 22:36 | 20m | -11 / - | TJ1GD | - / -21 | 3 | Partial capture |
| 08-27 22:32 | 20m | -7 / - | TJ1GD | - / -21 | 5 | Partial capture |
| 08-27 22:31 | 20m | - / -6 | KE2FSC | -16 / - | 2 | ✓ Closing fragment |
| 08-27 22:29 | 20m | -16 / - | KB3MAW | -24 / -7 | 3 | Partial capture |
| 08-27 22:26 | 20m | -6 / - | KD2QPU | - / -15 | 2 | Partial capture |
| 08-27 22:22 | 20m | -2 / - | W0OVX | - / -5 | 4 | Partial capture |
| 08-27 22:18 | 20m | +4 / - | BG4UVR | - / -11 | 2 | Partial capture |
| 08-27 22:18 | 20m | - / -9 | WA4FU | +1 / - | 5 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 222645 -4 606 KD2QPU IU5RCJ -15 (x2) 222900 -24 1978 IU5RCJ KB3MAW FN20 222915 -17 2296 KB3MAW IU5RCJ -07 (x2) 223100 -16 942 IU5RCJ KE2FSC R-06 (x2) 223215 -3 2289 TJ1GD IU5RCJ -21 (x8)
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