S57CNT — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving S57CNT, decoded by SO8OO in southeastern Poland. 138 FT8 messages attributed to this token as transmitter, on 160m, 40m, 20m, across 8 UTC dates in the available aggregate history. Observed between 2026-06-10 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 138 FT8 messages attributed to S57CNT as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 160 m (62%), followed by 40 m (28%) and 20 m (11%). Several six-hour UTC windows tied for the largest share (92%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.
Overview
Bands
Last attributed message: 2026-08-23 23:34 UTC
Observed FT8 message patterns
- Attributed sample
- 138 messages
- Active dates
- 8 UTC dates
- Estimated median S/N
- -13 dB
- Estimated 10th-90th percentile
- -20 to -6 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 51, moderate (-15 to -9 dB) 64, strong (≥ -8 dB) 23.
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 S57CNT 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 S57CNT
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 · 112 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 631 km (approx.)
- Last such locator decoded
- 2026-08-01 22:56 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 | S57CNT S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-23 23:36 | 20m | - / - | SV5BYP | -6 / - | 5 | Partial capture |
| 08-23 23:34 | 20m | -20 / -25 | XU7O | -2 / -12 | 4 | ✓ Full exchange observed |
| 08-01 22:57 | 160m | - / - | SP2LLP | -3 / - | 6 | Partial capture |
| 08-01 22:55 | 160m | -18 / - | F6DKQ | - / - | 2 | Partial capture |
| 08-01 22:52 | 160m | - / -9 | 9A2AJ | +12 / - | 2 | ✓ Closing fragment |
| 07-30 09:01 | 20m | -13 / - | VP5G | - / -13 | 11 | Partial capture |
| 06-25 22:13 | 20m | -19 / - | EX8ABR | - / - | 3 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 090445 -16 2098 VP5G S57CNT JN76 (x6) 233400 -1 502 S57CNT XU7O -25 233445 -20 1448 XU7O S57CNT R-12 233500 -2 503 S57CNT XU7O RR73 (x2) 233630 +0 1948 S57CNT SV5BYP KM46 (x5)
UTC dB Audio Message 225230 +11 2611 S57CNT 9A2AJ -09 (x2) 225515 -17 2021 F6DKQ S57CNT JN76 (x2) 225730 -4 2021 S57CNT SP2LLP JO94 (x6)
UTC dB Audio Message 092545 -17 1334 S57CNT LZ1ZF RR73
UTC dB Audio Message 233315 -21 2199 OA4ENG S57CNT JN76 (x2)
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