ON4KBU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Belgium Most frequent locator attributed to this token: JN29

Receiver-side FT8 activity involving ON4KBU, decoded by SO8OO in southeastern Poland. 538 FT8 messages attributed to this token as transmitter, on 20m, across 10 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-07-27.

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 538 FT8 messages attributed to ON4KBU 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 (100%). Most decodes (71%) fell within the six-hour window 08:00-14:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -15 dB.

Overview

538
Messages attributed
10
UTC dates decoded
129
Active 15-min windows
-15 dB
Estimated median S/N

Bands

20m · 538
First attributed message: 2026-06-09
Last attributed message: 2026-07-27 12:25 UTC

Observed FT8 message patterns

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

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 266, moderate (-15 to -9 dB) 235, strong (≥ -8 dB) 37.

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 ON4KBU 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 ON4KBU

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
JN29 · 458 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,206 km (approx.)
Last such locator decoded
2026-07-27 12:25 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 UTCBandON4KBU S/NCounterpartCounterpart S/NMsgsCapture
07-27 11:43 20m -15 / - PD1ACB - / - 2 Partial capture
07-27 11:28 20m -13 / - PD3PAM -23 / - 2 ✓ Closing observed
07-27 11:20 20m - / +6 OE9KFV -8 / - 2 ✓ Closing fragment
07-27 11:09 20m -17 / -6 PA0GDL -23 / - 2 Partial capture
07-27 11:08 20m -17 / -9 PE1BSF -17 / -11 2 Partial capture
07-27 09:45 20m -16 / - HA3GX - / - 2 Partial capture
07-27 09:37 20m - / -22 OK1AYZ -10 / - 2 Partial capture
07-27 09:21 20m -12 / -7 DK2MAX -22 / - 2 Partial capture
07-27 09:17 20m -16 / - F5NIB - / - 2 Partial capture
07-27 09:00 20m -14 / - OZ5RD - / - 2 Partial capture
07-27 08:57 20m -16 / +8 M7PHE -23 / - 3 Partial capture
07-27 08:48 20m -13 / - F5GPE - / - 3 Partial capture
07-27 08:44 20m -15 / - DL4MCA - / - 5 Partial capture
07-15 19:36 20m - / -17 IZ3JDL -1 / - 2 ✓ Closing fragment
07-15 19:26 20m -13 / -7 M0SLI -9 / - 2 ✓ Closing observed
07-15 18:31 20m -12 / - 9A3MAP - / -3 6 Partial capture
07-15 17:03 20m - / +5 IK1PXP -14 / - 4 ✓ Closing fragment
07-15 16:52 20m - / +1 IK3SCB -8 / - 3 ✓ Closing fragment
07-15 16:46 20m - / -9 F6ARS 0 / - 2 ✓ Closing fragment
07-15 15:07 20m -14 / - S56FML - / +10 3 Partial capture
07-15 15:01 20m -15 / - S59A - / - 3 Partial capture
07-15 14:42 20m -13 / -8 RA1QY -20 / - 2 Partial capture
07-15 14:22 20m -16 / - SQ9LDE - / +2 2 Partial capture
07-15 14:15 20m -11 / - UB2FDL - / - 2 Partial capture
07-15 13:40 20m -14 / - YO6BLU - / - 2 Partial capture
07-15 13:35 20m -15 / - YO6BLU - / - 3 Partial capture
07-15 13:11 20m -14 / - YO2AMU - / -4 2 Partial capture
07-15 13:00 20m -16 / - UA3PI - / - 3 Partial capture
07-15 12:41 20m -16 / - F5SZY -12 / -10 5 ✓ Closing observed
07-15 12:00 20m -16 / - F6IQA - / - 2 Partial capture
07-15 11:29 20m - / -15 SQ6MIH -6 / - 2 ✓ Closing fragment
07-15 11:22 20m -18 / -9 DG6TOM -14 / +4 3 ✓ Full exchange observed
07-15 11:13 20m -16 / - OZ1BUR - / - 2 Partial capture
07-15 10:45 20m -16 / - YO2AMU - / - 2 Partial capture
07-15 10:44 20m - / - DL1R -6 / - 11 Partial capture
07-15 10:37 20m -17 / - HB9HTG - / -14 3 ✓ Closing fragment
07-15 10:33 20m -15 / - DL3AS - / - 3 Partial capture
07-15 10:24 20m -14 / - UT0EP - / - 2 Partial capture
07-15 10:23 20m -13 / - HB9HTG - / - 2 Partial capture
07-15 10:20 20m -16 / - UT0EP - / - 2 Partial capture
07-15 10:16 20m -16 / - IU1VXD - / +3 2 Partial capture
07-15 10:13 20m -16 / -12 IK0ISD -18 / +6 5 Partial capture
07-15 10:08 20m -16 / -2 IU1VXD -18 / - 6 Partial capture
07-15 09:56 20m -14 / -6 IU3ODX -15 / +6 4 ✓ Full exchange observed
07-15 09:52 20m -14 / - IU3ODX - / - 4 Partial capture
07-15 09:48 20m -18 / - IU3ODX - / - 2 Partial capture
07-15 09:37 20m -12 / - IU1DSU - / - 4 Partial capture
07-15 09:33 20m -16 / - RA6OD - / -13 4 Partial capture
07-15 09:24 20m -14 / - SP9OCH - / - 2 Partial capture
07-15 09:16 20m -17 / - SP9JMZ - / - 3 Partial capture

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
120815 -10  531  ON4KBU DL6CGN -08
20m 
UTC    dB Audio  Message
111130 -23 1508  ON4KBU PA0GDL -06
111615 -16  852  PA2AMJ ON4KBU JN29
112030 -10 1004  ON4KBU OE9KFV +06 (x2)
112800 -23 1489  ON4KBU PD3PAM RR73
112815 -13  851  PD3PAM ON4KBU 73
113130  -5 2769  ON4KBU F1PBZ -17
114315 -15  851  PD1ACB ON4KBU JN29 (x2)
120530 -15  793  ON4KBU ON8AT JO21
120700 -18 2085  ON4KBU <...> -16
121600 -13 1702  ON4KBU F1NQP RR73
122315 -16  850  <...> ON4KBU JN29
122545 -15  851  2E0MBH ON4KBU JN29
124130 -14  850  ON4KBU F4MUD RR73

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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