S57TW — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Slovenia Most frequent locator attributed to this token: JN75

Receiver-side FT8 activity involving S57TW, decoded by SO8OO in southeastern Poland. 3,659 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 7 UTC dates in the available aggregate history. Observed between 2026-08-25 and 2026-09-06.

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 3,659 FT8 messages attributed to S57TW as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (61%), followed by 80 m (26%) and 20 m (13%). The busiest six-hour window was 18:00-00:00 UTC, containing 37% of decodes. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (98%); the estimated median was +9 dB.

Overview

3,659
Messages attributed
7
UTC dates decoded
141
Active 15-min windows
+9 dB
Estimated median S/N

Bands

80m · 942 40m · 2,237 20m · 480
First attributed message: 2026-08-25
Last attributed message: 2026-09-06 04:51 UTC

Observed FT8 message patterns

Attributed sample
3,659 messages
Active dates
7 UTC dates
Estimated median S/N
+9 dB
Estimated 10th-90th percentile
-1 to +15 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 18, moderate (-15 to -9 dB) 61, strong (≥ -8 dB) 3,580.

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 S57TW 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 S57TW

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
JN75 · 2,383 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
708 km (approx.)
Last such locator decoded
2026-09-06 04:51 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 UTCBandS57TW S/NCounterpartCounterpart S/NMsgsCapture
09-06 04:45 80m +8 / -6 DK3PM -20 / -13 4 ✓ Full exchange observed
09-06 04:39 80m +4 / -7 HF5A +7 / -7 5 ✓ Full exchange observed
09-06 04:35 80m +6 / -16 UR4LG -12 / -21 4 ✓ Full exchange observed
09-06 04:27 80m +8 / -10 YO5IB -2 / -7 5 ✓ Full exchange observed
09-06 04:23 80m +12 / -1 F4JCU -12 / +4 4 ✓ Full exchange observed
09-06 04:20 80m +6 / +5 OK1CI +18 / - 5 ✓ Full exchange observed
09-06 04:18 80m +2 / - EA7Y - / -15 3 ✓ Closing fragment
09-06 04:17 80m -1 / -5 SP7FFY +18 / +1 4 ✓ Full exchange observed
09-06 04:07 80m +4 / -3 EA3ISZ -14 / -11 5 ✓ Full exchange observed
09-06 04:07 80m +1 / - G4VMG -11 / -16 3 ✓ Closing observed
09-06 03:57 80m +19 / - DO7BE - / +3 2 ✓ Closing fragment
09-06 03:30 80m +16 / - LA1SFG/P - / -2 4 Partial capture
09-06 03:21 80m +16 / 0 F4IFK -6 / +5 4 ✓ Full exchange observed
09-06 03:19 80m +14 / +7 DF8RU +3 / +9 5 ✓ Full exchange observed
09-06 03:16 80m +17 / -11 DG7NFX -8 / +7 4 ✓ Full exchange observed
09-06 03:16 80m +13 / +2 ON4MAP -8 / - 5 ✓ Closing observed
09-06 03:08 80m +10 / +9 ON4MAP -5 / -9 5 ✓ Full exchange observed
09-06 03:01 80m +10 / -7 SQ3KO -11 / -17 4 ✓ Full exchange observed
09-06 02:55 80m +14 / +10 M0LOW -16 / -19 5 ✓ Full exchange observed
09-06 02:41 80m +9 / -14 LZ1EV +12 / +7 4 ✓ Full exchange observed
09-06 02:38 80m +12 / - LZ1GC +12 / +10 5 ✓ Full exchange observed
09-06 02:16 80m +18 / +1 DL1YAU +2 / -7 5 ✓ Full exchange observed
09-06 01:56 80m +16 / -1 R7DX +21 / +8 5 ✓ Full exchange observed
09-06 01:54 80m +14 / +10 YO3GNF -2 / 0 5 ✓ Full exchange observed
09-06 01:37 80m +12 / - DO1MER +4 / +4 4 ✓ Closing observed
09-06 01:28 80m +20 / -7 LA4O 0 / -10 5 ✓ Full exchange observed
09-06 01:25 80m +10 / - DO6FM - / +4 2 ✓ Closing fragment
09-06 01:19 80m +10 / - SM7TZK - / 0 2 ✓ Closing fragment
09-06 01:16 80m +6 / -7 SQ4PKO +8 / -6 5 ✓ Full exchange observed
09-06 01:15 80m +10 / +3 DO5PY 0 / -2 5 ✓ Full exchange observed
09-06 01:06 80m +6 / - VP8A 0 / -14 5 ✓ Closing observed
09-06 01:02 80m +4 / +5 SP4WJ +2 / -15 5 ✓ Full exchange observed
09-06 00:53 80m +8 / +2 LA1KNX 0 / -1 4 ✓ Full exchange observed
09-06 00:48 80m +16 / -15 LA4O 0 / -5 4 ✓ Full exchange observed
09-06 00:20 80m +14 / -10 R6ZEJ -2 / -10 4 ✓ Full exchange observed
09-06 00:15 80m +11 / - UB3BDJ -16 / -20 4 ✓ Closing observed
09-06 00:13 80m +9 / - VA2KZ - / -24 2 ✓ Closing fragment
09-06 00:10 80m +13 / +10 OZ7KJ/P +12 / +7 5 ✓ Full exchange observed
09-06 00:06 80m +13 / - R8QA - / -16 2 ✓ Closing fragment
09-06 00:03 80m +14 / 0 SV2SIF -14 / -7 5 ✓ Full exchange observed
09-05 23:56 80m +14 / -6 CT2GQA -18 / -10 4 ✓ Full exchange observed
09-05 23:46 80m +17 / -21 RA9YTI -14 / -17 7 ✓ Full exchange observed
09-05 23:38 80m +16 / -1 LA2W/P -3 / -8 5 ✓ Full exchange observed
09-05 23:37 80m +14 / - R1BLO - / -6 2 ✓ Closing fragment
09-05 23:28 80m +5 / +9 OH3GBW -3 / -3 8 ✓ Full exchange observed
09-05 23:14 80m +13 / - EA4DZR -24 / -13 3 ✓ Closing observed
09-05 23:07 80m +12 / 0 DA6IT -9 / 0 7 ✓ Full exchange observed
09-05 23:06 80m +16 / +3 DL9KM 0 / +5 5 ✓ Full exchange observed
09-05 23:02 80m +13 / +7 TA7I -12 / -17 3 ✓ Full exchange observed
09-05 22:53 80m +9 / -8 RY3F 0 / -3 4 ✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

80m 
UTC    dB Audio  Message
044530 +10 2383  CQ S57TW JN75
044545 -24 1867  S57TW DK3PM -06
044600  +7 2383  DK3PM S57TW R-13
044615 -17 1867  S57TW DK3PM RR73
044630 +10 2383  DK3PM S57TW RR73
044700 +16 2383  CQ S57TW JN75 (x10)
40m 
UTC    dB Audio  Message
071900 +12 2858  HB9HYO S57TW +07 (x2)
072100 +10 2858  CQ S57TW JN75 (x5)
072315  -2 1343  S57TW HA1ZW JN86 (x2)
072400 +11 2857  HA1ZW S57TW -15
072415  -2 1343  S57TW HA1ZW R-15 (x3)
072530 +11 2857  HA1ZW S57TW RR73
072545  +4 1343  S57TW HA1ZW 73
20m 
UTC    dB Audio  Message
065100  +4 2393  CQ S57TW JN75 (x3)
065215  +0 2394  S57TW IZ6BZQ JN63
065230  +8 2393  CQ S57TW JN75
065245  +1 2395  S57TW IZ6BZQ JN63
065300  +9 2394  CQ S57TW JN75
065315  +0 2395  S57TW IZ6BZQ JN63
065330  +0 2394  CQ S57TW JN75 (x7)

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