JO4JDU — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving JO4JDU, decoded by SO8OO in southeastern Poland. 4 FT8 messages attributed to this token as transmitter, on 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-06-14 and 2026-08-23.
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 4 FT8 messages attributed to JO4JDU as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The available sample contains attributed decodes on 20 m (100%). The sample is too small to infer a recurring UTC-hour or received-S/N pattern.
Overview
Observed FT8 message patterns
- Attributed sample
- 4 messages
- Active dates
- 3 UTC dates
- S/N summary
- Too few decodes
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
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 JO4JDU in decoded directed-looking exchanges:
Most frequent locator attributed to JO4JDU
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
- PM64 · 2 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 8,453 km (approx.)
- Last such locator decoded
- 2026-08-23 13:23 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 | JO4JDU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-02 07:47 | 10m | - / - | LZ2II | -23 / - | 2 | ✓ Closing fragment |
| 08-22 14:55 | 20m | - / -3 | IU1TLG | -6 / - | 3 | ✓ Closing fragment |
| 08-22 14:53 | 20m | - / -6 | RW4Z | -4 / - | 4 | ✓ Closing fragment |
| 08-22 14:50 | 20m | - / -12 | ON4AOI | -5 / - | 2 | ✓ Closing fragment |
| 08-17 15:38 | 20m | - / -15 | F4MSA | -5 / - | 3 | Partial capture |
| 07-18 16:12 | 20m | - / -23 | 2D0OMN | -11 / - | 5 | Partial capture |
| 07-18 15:48 | 20m | - / - | R7DX | -9 / - | 3 | Partial capture |
| 07-18 15:44 | 20m | - / -7 | DK9BF | -10 / - | 6 | ✓ Closing fragment |
| 07-18 15:41 | 20m | - / -5 | SP0VIP | +1 / - | 3 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 070600 -11 2499 JO4JDU RN6MA RR73 074715 -24 1691 JO4JDU LZ2II RR73 (x2)
UTC dB Audio Message 144245 -16 738 EX7CQ JO4JDU PM64 144330 -21 1765 JO4JDU RR73; E27EEL <...> -02 144815 -4 1973 JO4JDU EW6DM/P -06 145015 -4 1371 JO4JDU ON4AOI -12 (x2) 145315 +3 1935 JO4JDU RW4Z -06 (x3) 145545 -7 935 JO4JDU IU1TLG JN35 145615 -10 1935 JO4JDU RW4Z 73 145715 -7 935 JO4JDU IU1TLG R-03 (x2) 145815 -18 1746 JO4JDU G7SQC -12 132300 -23 1516 KB5YNF JO4JDU PM64 051530 -10 280 JO4JDU W7MTH -04
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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