JA3RSJ — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving JA3RSJ, decoded by SO8OO in southeastern Poland. 5 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-06-06.
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 5 FT8 messages attributed to JA3RSJ 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 -11 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 5 messages
- Active dates
- 1 UTC dates
- Estimated median S/N
- -11 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 2, strong (≥ -8 dB) 2.
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 JA3RSJ in decoded directed-looking exchanges:
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 | JA3RSJ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-06 19:54 | 40m | - / -20 | HA1TIB | 0 / - | 2 | Partial capture |
| 09-06 19:44 | 40m | - / -20 | LZ5UY | -2 / - | 2 | ✓ Closing fragment |
| 08-26 02:56 | 20m | - / -19 | K2TQC | -13 / - | 2 | Partial capture |
| 08-22 19:16 | 20m | - / -19 | EB5AL | +2 / - | 6 | ✓ Closing fragment |
| 08-04 22:44 | 20m | - / -24 | EA8UP | -12 / - | 2 | ✓ Closing fragment |
| 07-25 20:05 | 20m | - / -11 | EA5ISM | -12 / - | 2 | ✓ Closing fragment |
| 07-12 20:01 | 20m | - / - | EA5W | -7 / - | 7 | ✓ Closing fragment |
| 06-27 20:38 | 20m | - / -8 | SP4JAW | -8 / - | 2 | Partial capture |
| 06-27 20:31 | 20m | - / -5 | IZ2DPX | +2 / - | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 194400 -2 1375 JA3RSJ LZ5UY -20 (x2) 195400 +0 1191 JA3RSJ HA1TIB -20 (x2)
UTC dB Audio Message 200445 -3 579 JA3RSJ EA5W IM97 (x2) 201730 -10 855 JA3RSJ M8KKH JO01 200500 -11 1566 JA3RSJ EA5ISM -11 (x2) 224400 -11 1368 JA3RSJ EA8UP -24 (x2) 191600 +2 633 JA3RSJ EB5AL IM99 (x6) 025615 -15 932 JA3RSJ K2TQC -19 (x2)
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee