JA4WLF — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving JA4WLF, decoded by SO8OO in southeastern Poland. 104 FT8 messages attributed to this token as transmitter, on 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-06-17.
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 104 FT8 messages attributed to JA4WLF as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9 dB.
Overview
Observed FT8 message patterns
- Attributed sample
- 104 messages
- Active dates
- 6 UTC dates
- Estimated median S/N
- -9 dB
- Estimated 10th-90th percentile
- -15 to -6 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 6, moderate (-15 to -9 dB) 59, strong (≥ -8 dB) 39.
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 JA4WLF in decoded directed-looking exchanges:
Most frequent locator attributed to JA4WLF
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 · 42 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 8,453 km (approx.)
- Last such locator decoded
- 2026-06-17 19:56 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 | JA4WLF S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-31 11:41 | 20m | - / -7 | UA3ZQN | +5 / - | 3 | ✓ Closing fragment |
| 08-24 20:57 | 20m | - / -15 | DH2RL | -9 / - | 2 | ✓ Closing fragment |
| 07-16 21:03 | 20m | - / - | F5PBG | -8 / - | 4 | Partial capture |
| 07-16 21:01 | 20m | - / -15 | F5NNN | -8 / - | 5 | ✓ Closing fragment |
| 07-16 20:33 | 20m | - / +4 | IS0AEL | +2 / - | 2 | ✓ Closing fragment |
| 07-16 20:17 | 20m | - / -20 | EA4BU | -17 / - | 5 | Partial capture |
| 06-23 20:44 | 20m | - / - | M0DHO | +6 / - | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 210130 -7 1140 JA4WLF F5NNN IN94 (x3) 210300 -10 1191 JA4WLF F5PBG IN78 210300 -5 1140 JA4WLF F5NNN 73 210330 -8 1191 JA4WLF F5PBG IN78 (x3) 211345 -7 1251 JA4WLF EB5DFU -19 205715 -13 2287 JA4WLF DH2RL R-15 (x2) 195300 -12 1124 JA4WLF TA2ED RR73 114115 +8 2462 JA4WLF UA3ZQN KO90 (x3)
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