TK4US — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Corsica Most frequent locator attributed to this token: JN41

Receiver-side FT8 activity involving TK4US, decoded by SO8OO in southeastern Poland. 92 FT8 messages attributed to this token as transmitter, on 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-07-25 and 2026-07-28.

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 92 FT8 messages attributed to TK4US as the transmitting token by decoded message structure across 3 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 (77%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's weak S/N range (83%); the estimated median was -19 dB.

Overview

92
Messages attributed
3
UTC dates decoded
15
Active 15-min windows
-19 dB
Estimated median S/N

Bands

20m · 92
First attributed message: 2026-07-25
Last attributed message: 2026-07-28 16:28 UTC

Observed FT8 message patterns

Attributed sample
92 messages
Active dates
3 UTC dates
Estimated median S/N
-19 dB
Estimated 10th-90th percentile
-24 to -15 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 76, moderate (-15 to -9 dB) 15, strong (≥ -8 dB) 1.

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 TK4US 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 TK4US

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
JN41 · 45 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,363 km (approx.)
Last such locator decoded
2026-07-28 16:26 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 UTCBandTK4US S/NCounterpartCounterpart S/NMsgsCapture
07-28 16:28 20m -16 / - SP1LJZ - / -4 2 ✓ Closing fragment
07-28 16:27 20m -19 / -8 UA6HRB -8 / - 3 ✓ Closing observed
07-28 16:23 20m -15 / - F4BJN - / -15 2 ✓ Closing fragment
07-28 05:57 20m - / -22 RW3QW -6 / - 2 ✓ Closing fragment
07-28 05:38 20m - / - IW2ENA -14 / - 3 Partial capture
07-28 05:34 20m - / - SV2AOB -9 / - 2 Partial capture
07-28 05:27 20m -20 / - UT1KWA - / -1 2 ✓ Closing fragment
07-28 05:24 20m -20 / - 7Z1BQ - / -16 2 Partial capture
07-28 05:21 20m -20 / - SV2HXV - / -16 5 ✓ Closing fragment
07-27 20:34 20m - / - EA2DYB -9 / - 5 Partial capture
07-27 20:33 20m - / -18 RN6MA +3 / - 2 ✓ Closing fragment
07-27 20:33 20m - / - SV8IIQ -13 / - 2 Partial capture
07-27 20:29 20m - / -6 G7FPE -12 / - 5 ✓ Closing fragment
07-27 20:28 20m - / -12 PD2FS -10 / - 3 ✓ Closing fragment
07-27 20:27 20m - / - 2E0XPQ -6 / - 2 Partial capture
07-27 20:26 20m - / - M8KKH -6 / - 3 Partial capture
07-27 20:13 20m - / -13 M0PFX -19 / - 2 Partial capture
07-27 20:10 20m -18 / - SP8GEY - / -5 2 ✓ Closing fragment
07-27 20:08 20m - / - EA1BCK -5 / - 4 Partial capture
07-27 20:06 20m - / -11 UX5UW -10 / - 3 ✓ Closing fragment
07-27 20:03 20m - / - SV8IIQ -17 / - 3 Partial capture
07-27 19:57 20m -22 / - PD7BDN 0 / -15 3 Partial capture
07-27 19:56 20m - / - SV8IIQ -16 / - 4 Partial capture
07-27 19:53 20m -20 / - SP3WBW - / -8 2 ✓ Closing fragment
07-27 19:45 20m -17 / - CR7CBL - / -17 3 ✓ Closing fragment
07-27 19:41 20m -18 / - SP2MS - / -22 2 Partial capture
07-27 19:40 20m - / -19 R2RAU -11 / - 2 Partial capture
07-27 17:51 20m - / -26 EA5W -14 / - 6 Partial capture
07-25 20:27 20m -19 / -8 PY1RY -16 / -8 3 Partial capture
07-25 20:21 20m - / - PA/DL7DS -12 / - 2 Partial capture
07-25 19:57 20m -24 / - LU8EKC - / -11 2 Partial capture
07-25 19:52 20m -18 / +2 CN2DX +4 / +1 3 ✓ Full exchange observed
07-25 19:49 20m -17 / -5 PD8F -7 / -14 14 Partial capture
07-25 19:37 20m - / -12 MW0DNF -5 / - 2 Partial capture
07-25 19:28 20m -20 / - IS0KNG - / - 3 Partial capture
07-25 19:22 20m - / -16 RN6MA +5 / - 3 Partial capture
07-25 19:20 20m - / -21 JA4LXY -14 / - 2 ✓ Closing fragment
07-25 19:09 20m -24 / -12 RA8AM -16 / -17 4 ✓ Full exchange observed
07-25 19:08 20m - / - G8IXM -11 / - 2 Partial capture
07-25 18:47 20m - / - TK4QP +7 / - 4 Partial capture
07-25 18:44 20m -16 / - DK9OV - / -16 3 Partial capture
07-25 18:43 20m - / - SV2AOB -8 / - 2 Partial capture
07-25 18:33 20m -14 / - 9K2OK - / - 8 Partial capture

Recent FT8 messages decoded at SO8OO

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

20m 
UTC    dB Audio  Message
055645 -23 1677  CQ TK4US JN41
055700  -3 1586  TK4US RW3QW -22 (x2)
055845 -24 1677  CQ TK4US JN41
162300 -18 1677  RY6O TK4US RR73
162330 -17 1677  F4BJN TK4US -15 (x2)
162430 -15 1676  IS0KNG TK4US JN41
162600 -24 1676  CQ TK4US JN41                         a1 (x2)
162715  -9 1675  TK4US UA6HRB R-08
162730 -19 1677  UA6HRB TK4US RR73
162745  -7 1676  TK4US UA6HRB 73
162800 -16 1677  SP1LJZ TK4US -04 (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.

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