S57JK — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving S57JK, decoded by SO8OO in southeastern Poland. 153 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 10 UTC dates in the available aggregate history. Observed between 2026-06-30 and 2026-08-22.
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 153 FT8 messages attributed to S57JK as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (67%), followed by 10 m (33%). Most decodes (74%) fell within the six-hour window 11:00-17:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.
Overview
Bands
Last attributed message: 2026-08-22 11:18 UTC
Observed FT8 message patterns
- Attributed sample
- 153 messages
- Active dates
- 10 UTC dates
- Estimated median S/N
- -14 dB
- Estimated 10th-90th percentile
- -20 to -4 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 59, moderate (-15 to -9 dB) 58, strong (≥ -8 dB) 36.
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 S57JK in decoded directed-looking exchanges:
Attributed messages by UTC hour
Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.
Most frequent locator attributed to S57JK
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
- JN76 · 78 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 631 km (approx.)
- Last such locator decoded
- 2026-08-22 11:18 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 | S57JK S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-25 20:27 | 20m | - / -17 | BU2FW | -19 / - | 2 | Partial capture |
| 08-25 20:17 | 20m | - / -5 | M7VKI | -3 / - | 4 | ✓ Closing fragment |
| 08-22 11:18 | 20m | -7 / -12 | F4LJG | -10 / -7 | 3 | Partial capture |
| 08-22 11:16 | 20m | -7 / - | K2TQC | - / - | 2 | Partial capture |
| 08-22 11:12 | 20m | -8 / - | OK2FAB | - / -17 | 2 | Partial capture |
| 08-22 11:08 | 20m | 0 / -20 | YO5PHL | -15 / -13 | 8 | ✓ Full exchange observed |
| 08-22 11:02 | 20m | -2 / - | OK2CNI | - / - | 2 | Partial capture |
| 08-13 18:04 | 20m | - / - | PA3BMB | -8 / - | 2 | ✓ Closing fragment |
| 08-13 18:00 | 20m | - / -7 | ON1DGN | -22 / - | 2 | ✓ Closing fragment |
| 08-08 19:05 | 20m | -17 / - | SV1EAG | - / -15 | 3 | ✓ Closing fragment |
| 08-08 18:42 | 20m | - / -5 | ON4CLP | 0 / - | 4 | ✓ Closing fragment |
| 08-08 18:40 | 20m | - / -9 | PD1HPB | -10 / - | 5 | ✓ Closing fragment |
| 07-28 20:28 | 20m | -12 / - | W7WMB | - / - | 2 | Partial capture |
| 07-28 20:27 | 20m | - / -7 | DH1KU | -9 / - | 7 | Partial capture |
| 07-28 20:22 | 20m | - / - | DH1KU | -9 / - | 3 | Partial capture |
| 07-28 19:43 | 20m | - / - | RZ4FWA | -12 / - | 3 | Partial capture |
| 07-28 19:43 | 20m | - / -4 | R4FDW | -16 / - | 10 | ✓ Closing fragment |
| 07-24 14:11 | 20m | -13 / - | DF3IS | - / -15 | 4 | Partial capture |
| 07-24 14:08 | 20m | -16 / - | SV9TRN | - / - | 2 | Partial capture |
| 07-24 14:06 | 20m | -10 / -13 | PD1PSR | -15 / -11 | 3 | ✓ Full exchange observed |
| 07-24 13:59 | 20m | -10 / - | DL2VLL | -9 / -1 | 6 | ✓ Closing observed |
| 07-24 13:55 | 20m | -12 / - | PD2FS | - / -15 | 2 | ✓ Closing fragment |
| 07-24 13:53 | 20m | -2 / -14 | PA8S | -12 / - | 3 | ✓ Closing observed |
| 07-24 13:51 | 20m | -16 / -9 | OZ9FF | -11 / -11 | 3 | ✓ Full exchange observed |
| 07-20 20:02 | 20m | - / -3 | F5RRS | +13 / - | 3 | ✓ Closing fragment |
| 07-18 20:54 | 10m | -17 / - | YY4GPM | - / - | 5 | Partial capture |
| 07-18 20:52 | 10m | -18 / - | HG8LXL | - / -21 | 2 | ✓ Closing fragment |
| 07-18 20:37 | 10m | -20 / - | OZ2BMN | - / - | 2 | Partial capture |
| 07-18 19:10 | 20m | - / - | DM4GG | -10 / - | 2 | Partial capture |
| 07-18 19:09 | 20m | -15 / - | F5HNQ | +1 / - | 2 | ✓ Closing observed |
| 07-18 19:06 | 20m | -15 / - | F1ODM | - / -18 | 2 | ✓ Closing fragment |
| 07-18 18:50 | 20m | -16 / - | ON1JP | - / -16 | 3 | ✓ Closing fragment |
| 07-09 16:17 | 20m | - / -12 | RN6MA | +1 / - | 3 | Partial capture |
| 07-09 16:10 | 20m | - / -12 | TA2ED | -18 / - | 3 | Partial capture |
| 07-09 15:47 | 20m | - / +4 | F5OZC | -11 / - | 2 | Partial capture |
| 07-05 14:13 | 20m | -15 / - | OZ7DR | - / - | 3 | Partial capture |
| 07-05 14:06 | 20m | -17 / - | DL9UXF | - / -18 | 2 | Partial capture |
| 07-05 14:04 | 20m | -19 / -7 | TM2WWA | -20 / 0 | 3 | ✓ Full exchange observed |
| 07-05 14:03 | 20m | - / - | DL9UXF | -17 / - | 2 | Partial capture |
| 07-05 13:46 | 10m | -9 / - | 8Q7PR | - / - | 5 | Partial capture |
| 07-05 13:43 | 10m | -18 / - | G0ANS | - / +1 | 2 | ✓ Closing fragment |
| 07-05 13:39 | 10m | -17 / - | D2UY | - / - | 2 | ✓ Closing fragment |
| 07-05 13:36 | 10m | -17 / - | R7RAE | - / -14 | 5 | ✓ Closing fragment |
| 07-05 13:32 | 10m | -14 / - | A71AT | - / -2 | 5 | ✓ Closing fragment |
| 07-05 13:28 | 10m | -18 / - | UR4QWW | - / -10 | 2 | ✓ Closing fragment |
| 07-05 13:27 | 10m | -12 / - | F4FPR | - / -11 | 2 | ✓ Closing fragment |
| 07-05 13:25 | 10m | -14 / - | SQ4PKO | - / -5 | 2 | ✓ Closing fragment |
| 07-05 13:23 | 10m | -15 / - | UA3PAB | - / -16 | 4 | ✓ Closing fragment |
| 07-05 13:22 | 10m | -8 / - | SV9MBH | - / -7 | 2 | ✓ Closing fragment |
| 07-04 14:06 | 20m | - / - | PC2J | -16 / - | 6 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 111600 -8 1524 K2TQC S57JK JN76 (x2) 111700 -3 2234 CQ S57JK JN76 (x3) 111815 -10 2012 S57JK F4LJG IN93 111830 -7 2012 F4LJG S57JK -07 111845 -9 2012 S57JK F4LJG R-12 201715 -4 2766 S57JK M7VKI JO02 (x4) 202145 -17 863 S57JK G8IXM JO02 202700 -19 1377 S57JK BU2FW -17 (x2)
UTC dB Audio Message 134730 -10 1599 8Q7PR S57JK JN76 (x2) 203200 -22 2022 S57JK YO9PH -05 203715 -21 1597 OZ2BMN S57JK JN76 (x2) 205145 -19 1597 M0PWX S57JK RR73 205245 -18 1597 HG8LXL S57JK -21 (x2) 205445 -16 1597 YY4GPM S57JK JN76 (x3) 205645 -12 1597 CQ S57JK JN76 205715 -18 1597 YY4GPM S57JK JN76 (x2) 205815 -20 1597 HI8JWM S57JK JN76
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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