S57MPU — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving S57MPU, decoded by SO8OO in southeastern Poland. 2,420 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, 10m, across 22 UTC dates in the available aggregate history. Observed between 2026-08-13 and 2026-09-11.
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 2,420 FT8 messages attributed to S57MPU as the transmitting token by decoded message structure across 22 UTC dates in the available aggregate history. The largest monitored-band total was 60 m (42%), followed by 40 m (20%) and 80 m (14%). Most decodes (64%) fell within the six-hour window 18:00-00:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (93%); the estimated median was +4 dB.
Overview
Bands
Last attributed message: 2026-09-11 05:25 UTC
Observed FT8 message patterns
- Attributed sample
- 2,420 messages
- Active dates
- 22 UTC dates
- Estimated median S/N
- +4 dB
- Estimated 10th-90th percentile
- -6 to +12 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 47, moderate (-15 to -9 dB) 116, strong (≥ -8 dB) 2,257.
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 S57MPU 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 S57MPU
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 · 1,493 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 631 km (approx.)
- Last such locator decoded
- 2026-09-11 05:25 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 | S57MPU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-11 09:00 | 10m | - / -11 | UN7NU | -18 / - | 2 | ✓ Closing fragment |
| 09-11 05:23 | 60m | - / - | DK2MAX | +1 / - | 5 | Partial capture |
| 09-11 05:22 | 60m | -5 / - | ON4DN | -8 / -2 | 5 | ✓ Closing observed |
| 09-11 05:21 | 60m | -4 / +8 | DL6NDN | -15 / -3 | 5 | ✓ Full exchange observed |
| 09-11 05:18 | 60m | -4 / - | N8OQ | - / -24 | 4 | ✓ Closing fragment |
| 09-11 05:16 | 60m | - / - | F5MXH | -17 / - | 3 | Partial capture |
| 09-11 04:40 | 40m | - / - | OO0O | -6 / - | 2 | Partial capture |
| 09-11 04:34 | 40m | - / -7 | F1PBZ | -3 / - | 4 | Partial capture |
| 09-11 03:42 | 40m | - / -6 | RK4FF | -7 / - | 3 | ✓ Closing fragment |
| 09-10 20:55 | 80m | - / - | DO1SWC | -17 / - | 3 | Partial capture |
| 09-10 20:54 | 80m | - / -1 | DO5PY | -16 / - | 3 | Partial capture |
| 09-10 20:52 | 80m | - / +2 | DG2EBG | -11 / - | 2 | ✓ Closing fragment |
| 09-10 20:46 | 80m | - / - | DO9BAU | +5 / - | 13 | Partial capture |
| 09-10 20:46 | 80m | - / +1 | YO4NF | +2 / - | 2 | ✓ Closing fragment |
| 09-10 20:44 | 80m | - / -6 | F5RRS | +9 / - | 5 | ✓ Closing fragment |
| 09-10 20:43 | 80m | - / - | T77RN | -2 / - | 2 | ✓ Closing fragment |
| 09-10 20:35 | 60m | - / -6 | DK9PH | +2 / - | 5 | ✓ Closing fragment |
| 09-10 18:07 | 80m | - / -4 | UA3QNA | +7 / - | 2 | Partial capture |
| 09-10 18:03 | 80m | - / - | DL1YFS | -4 / - | 4 | Partial capture |
| 09-10 18:03 | 80m | - / - | IU2KNG | -4 / - | 2 | ✓ Closing fragment |
| 09-10 18:02 | 80m | - / +3 | SQ9DJQ | +11 / - | 6 | Partial capture |
| 09-10 17:31 | 60m | - / - | PE1NPS | 0 / - | 3 | Partial capture |
| 09-10 14:16 | 40m | - / +6 | DK7ZT | -20 / - | 3 | Partial capture |
| 09-10 14:15 | 40m | -12 / - | M0SCK | - / -9 | 2 | ✓ Closing fragment |
| 09-10 14:14 | 40m | -6 / - | F5RRS | - / - | 2 | ✓ Closing fragment |
| 09-10 14:14 | 40m | - / - | DL7FAI | -13 / - | 4 | Partial capture |
| 09-10 14:13 | 40m | -4 / -5 | UR1CCT | +15 / - | 5 | ✓ Full exchange observed |
| 09-10 14:01 | 40m | -3 / - | F4FSY | -22 / -25 | 5 | ✓ Closing observed |
| 09-10 14:01 | 40m | - / - | F5RRS | -1 / - | 4 | Partial capture |
| 09-10 13:59 | 40m | - / - | DK7ZT | -19 / - | 3 | Partial capture |
| 09-10 13:59 | 40m | -4 / -7 | F6BTP | -20 / +1 | 3 | Partial capture |
| 09-06 06:03 | 60m | +3 / - | G1SID | - / -4 | 3 | ✓ Closing fragment |
| 09-06 05:32 | 60m | +5 / +6 | SP3FXC | +12 / - | 4 | ✓ Full exchange observed |
| 09-06 05:30 | 60m | +10 / - | EA1JWG | -12 / - | 3 | ✓ Closing observed |
| 09-06 05:29 | 60m | +6 / - | PC1K | - / -2 | 2 | ✓ Closing fragment |
| 09-06 05:28 | 60m | +10 / - | EA7KBX | - / - | 2 | ✓ Closing fragment |
| 09-06 05:26 | 60m | +10 / - | IW9FRA | - / - | 4 | Partial capture |
| 09-06 05:03 | 60m | +10 / - | EA3RO | - / -16 | 2 | ✓ Closing fragment |
| 09-06 05:01 | 60m | +7 / - | ZL2CC | - / -17 | 3 | ✓ Closing fragment |
| 09-06 05:00 | 60m | +10 / - | SP9W | +12 / - | 5 | ✓ Full exchange observed |
| 09-06 04:55 | 60m | +8 / -14 | LA2W/P | -13 / -5 | 7 | ✓ Full exchange observed |
| 09-06 04:55 | 60m | +9 / - | S52AS | -13 / - | 6 | ✓ Full exchange observed |
| 09-06 04:52 | 60m | +5 / - | EB4FOG | - / -10 | 3 | Partial capture |
| 09-06 04:51 | 60m | +7 / -7 | HF5A | +12 / +6 | 5 | Partial capture |
| 09-06 04:46 | 60m | +7 / - | W4DXX | - / - | 8 | Partial capture |
| 09-06 03:45 | 60m | -2 / +2 | OM1CI | +12 / - | 5 | ✓ Full exchange observed |
| 09-06 03:42 | 60m | -5 / -4 | OM5JG | +1 / +9 | 6 | ✓ Full exchange observed |
| 09-06 03:37 | 40m | - / -13 | R7LC | +5 / - | 6 | ✓ Closing fragment |
| 09-06 02:08 | 60m | - / - | SV1EKI | -2 / - | 8 | Partial capture |
| 09-06 02:05 | 60m | -2 / 0 | LA4O | -13 / - | 5 | ✓ Full exchange observed |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 074045 +6 775 CQ S57MPU JN76 ? a1 074115 +5 775 ES5MG S57MPU JN76 074330 -18 1242 S57MPU PG5FRL JO22 074415 +6 775 UR5VPR S57MPU RR73 074445 +2 775 CQ S57MPU JN76 (x4) 075415 -1 727 JA5MHD S57MPU R-10 103700 -22 1562 S57MPU EA8AP RR73 105530 -17 1163 S57MPU CU2AP -12 (x2) 073130 -20 1769 S57MPU EX7CQ RR73 090015 -18 1142 S57MPU UN7NU -11 (x2)
UTC dB Audio Message 052230 -8 487 S57MPU ON4DN JO20 052245 -2 1409 ON4DN S57MPU -02 (x2) 052330 +2 2587 S57MPU DK2MAX JN58 052345 -5 1409 ON4DN S57MPU RR73 052400 +3 2587 S57MPU DK2MAX JN58 052400 -9 487 S57MPU ON4DN 73 052415 -7 1409 CQ S57MPU JN76 052430 +1 2587 S57MPU DK2MAX JN58 052445 -3 1409 CQ S57MPU JN76 052500 -3 2587 S57MPU DK2MAX JN58 052515 -5 1409 CQ S57MPU JN76 052530 +0 2587 S57MPU DK2MAX JN58 052545 -2 1096 CQ S57MPU JN76 052600 -15 2115 S57MPU DL4YDR JO32
UTC dB Audio Message 141615 -14 1420 M0SCK S57MPU RR73 141630 -20 1907 S57MPU DK7ZT +06 (x3) 034215 -8 232 S57MPU RK4FF -06 (x3) 043015 +2 2512 S57MPU OD5KU KM73 043415 -2 2534 S57MPU F1PBZ -07 (x4) 043745 -5 342 S57MPU OO0O JO11 (x3)
UTC dB Audio Message 204900 +3 2402 S57MPU DO9BAU JO62 (x7) 205230 -12 198 S57MPU DG2EBG R+02 (x2) 205430 -15 203 S57MPU DO5PY R-01 205500 -14 1909 S57MPU DO1SWC JN58 205500 -16 202 S57MPU DO5PY R-01 205530 -20 1910 S57MPU DO1SWC JN58 (x2) 205600 -18 202 S57MPU DO5PY R-01
UTC dB Audio Message 020015 +2 2097 S57MPU ER3UA KN37 020030 +9 1381 SP3HDU S57MPU RR73 020045 -24 1744 S57MPU EA8AR IL18 020045 -2 1380 S57MPU SP3HDU 73 020045 +3 2097 S57MPU ER3UA KN37 020100 +3 1381 CQ S57MPU JN76 020115 -24 1745 S57MPU EA8AR IL18 020115 -6 2097 S57MPU ER3UA KN37 020130 +3 1380 CQ S57MPU JN76 020145 -24 1745 S57MPU EA8AR IL18 020200 +2 1381 CQ S57MPU JN76 020215 -24 1745 S57MPU EA8AR IL18 020230 +2 1381 CQ S57MPU JN76 (x3)
UTC dB Audio Message 200030 -18 1500 CS8ABF S57MPU JN76 (x7) 200400 -9 1500 S55B S57MPU JN76 200645 -11 702 CS8ABF S57MPU JN76 (x2) 200915 -9 702 BI4JJO S57MPU RRR 201015 -16 702 BD4VOJ S57MPU -11 201745 -17 702 CQ S57MPU JN76 201830 +5 707 S57MPU G0RVY JO01 201900 -10 2022 S57MPU G3ROY IO70
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.
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee