F4MBU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: France Most frequent locator attributed to this token: JN23

Receiver-side FT8 activity involving F4MBU, decoded by SO8OO in southeastern Poland. 1,628 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 60 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-09.

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 1,628 FT8 messages attributed to F4MBU as the transmitting token by decoded message structure across 60 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (52%), followed by 20 m (42%) and 10 m (5%). 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 -11 dB.

Overview

1,628
Messages attributed
60
UTC dates decoded
215
Active 15-min windows
-11 dB
Estimated median S/N

Bands

80m · 16 40m · 839 20m · 689 10m · 84
First attributed message: 2026-06-06
Last attributed message: 2026-09-09 23:18 UTC

Observed FT8 message patterns

Attributed sample
1,628 messages
Active dates
60 UTC dates
Estimated median S/N
-11 dB
Estimated 10th-90th percentile
-17 to -4 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 292, moderate (-15 to -9 dB) 802, strong (≥ -8 dB) 534.

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 F4MBU 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 F4MBU

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
JN23 · 1,343 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,462 km (approx.)
Last such locator decoded
2026-09-09 23:17 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 UTCBandF4MBU S/NCounterpartCounterpart S/NMsgsCapture
09-09 23:17 40m -7 / -6 VO1AW -22 / -3 5 ✓ Full exchange observed
09-09 23:11 40m -5 / - RZ6AKF - / -9 5 Partial capture
09-09 23:02 40m -10 / - XU7AKP - / - 10 Partial capture
09-09 23:00 40m -13 / - TF1PA - / -10 4 ✓ Closing fragment
09-09 22:50 40m -14 / - RX9WM -10 / -6 10 Partial capture
09-09 22:40 40m -14 / - LU3CQ - / - 3 Partial capture
09-09 22:32 40m -16 / - WB8KFW - / -13 3 Partial capture
09-09 22:26 40m -13 / +5 G0CMQ -11 / -7 6 ✓ Full exchange observed
09-09 22:19 40m -12 / -13 RC9WC -4 / -7 4 ✓ Full exchange observed
09-09 22:18 40m -13 / -20 PA1PJ -16 / - 2 ✓ Closing observed
09-09 22:15 40m - / - PD7BDN -10 / - 6 Partial capture
09-09 22:05 40m - / -16 JY5IB -20 / - 2 ✓ Closing fragment
09-09 21:59 40m -7 / - M8MFU -14 / -10 5 Partial capture
09-09 21:59 40m -7 / -10 2E0GKF -7 / -6 2 Partial capture
09-09 21:54 40m -4 / - M8FQT -14 / -14 7 Partial capture
09-09 21:52 40m -2 / - NP4PR - / - 2 Partial capture
09-08 22:11 40m +6 / - PP6BVM - / - 2 Partial capture
09-08 22:10 40m +2 / - N1WI - / - 2 Partial capture
09-08 22:02 40m -2 / -24 MM0DXL -15 / +3 6 ✓ Full exchange observed
09-08 22:01 40m 0 / -18 RJ6ON -4 / -6 4 Partial capture
09-08 21:28 40m -10 / -9 JY5IB -19 / -19 5 Partial capture
09-08 21:25 40m -2 / - VK6NWF - / -16 5 ✓ Closing fragment
09-08 21:22 40m -6 / - W1XI - / -17 3 Partial capture
09-08 21:13 40m -9 / - CX6TU - / - 3 Partial capture
09-06 22:56 40m - / - EA2FGV -13 / - 3 Partial capture
09-06 22:52 40m -9 / - EA2ADP - / -12 2 ✓ Closing fragment
09-06 22:43 40m - / - M0PFX -15 / - 6 Partial capture
09-06 22:34 40m -14 / - XV9B - / - 3 Partial capture
09-06 22:30 40m -14 / +6 G0PZA -4 / -16 10 Partial capture
09-06 22:28 40m - / -14 SH5RJX -6 / - 3 ✓ Closing fragment
09-06 22:26 40m - / +1 DG1ROL -1 / - 3 ✓ Closing fragment
09-06 22:24 40m -16 / - CA1OGG - / - 2 Partial capture
09-06 22:09 40m - / - DL7ACA +15 / - 11 Partial capture
09-06 21:09 40m - / -10 UR4QWW -6 / - 3 ✓ Closing fragment
09-06 21:08 40m - / - F5SJC +2 / - 2 Partial capture
09-06 21:06 40m - / - DL7ACA +4 / - 3 Partial capture
09-05 23:11 40m -17 / - OZ3FYN/P - / - 2 Partial capture
09-05 23:04 40m -17 / - OA4ENG - / - 2 Partial capture
09-05 22:52 40m -16 / - OA4ENG - / - 3 Partial capture
09-05 22:48 40m - / - IU5VLR -4 / - 2 Partial capture
09-05 22:43 40m -19 / -18 LA9H -1 / -6 4 Partial capture
09-05 22:42 40m -16 / - VJ6X - / - 3 Partial capture
09-05 22:33 40m -14 / - D44TWO - / -19 4 Partial capture
09-05 22:30 40m -16 / - VJ6X - / - 3 Partial capture
09-05 22:12 40m - / -5 G7RZA -18 / - 2 Partial capture
09-05 21:40 40m - / -14 LA8G -7 / - 3 ✓ Closing fragment
09-05 21:12 40m - / -5 OZ/HB9TYU -7 / - 8 Partial capture
09-05 21:09 40m - / -12 DG5PW -6 / - 4 ✓ Closing fragment
09-03 22:07 80m - / - DO8JB -14 / - 6 Partial capture
09-01 22:16 80m - / -7 F1PBZ -4 / - 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
231115  -3 1362  RZ6AKF F4MBU R-09 (x5)
231345  -7 1363  CQ F4MBU JN23 (x3)
231530 -18 1908  F4MBU VO1AW GN28
231545 -15 1363  SP9JCN F4MBU -07
231745  -8 1363  VO1AW F4MBU JN23
231800 -22 1909  F4MBU VO1AW -06
231815  -2 1363  VO1AW F4MBU R-03
231830 -21 1909  F4MBU VO1AW RR73
231845 -11 1363  VO1AW F4MBU 73
80m 
UTC    dB Audio  Message
225945  +9  590  F4MBU US2YW KN28
230000 -24  591  CQ F4MBU JN23
230015 +12  590  F4MBU US2YW KN28
222930 -21 1219  F4MBU HB9MZI JN49
221630  -5 2253  F4MBU F1PBZ -07 (x3)
221930  -3  857  F4MBU DA6LRW JN48
220700 -15  710  CQ F4MBU JN23
220745 -10  710  F4MBU DO8JB JO32 (x6)
20m 
UTC    dB Audio  Message
222430 -14 1006  F4MBU DJ7LA JO33
223630  -9  890  F4MBU KJ1R FN32 (x3)
210230  -1  664  CQ F4MBU JN23 (x5)
210500  +1  664  KE4NVI F4MBU JN23
210515  +0 1968  F4MBU 5Z4VJ KI88
210600  +0  665  A41ZZ F4MBU JN23
210700  +3  665  PP5HR F4MBU JN23 (x3)
10m 
UTC    dB Audio  Message
150815 -14  969  CQ F4MBU JN23 (x2)
144330  -4  629  F4MBU DK8HC JO42 (x3)
145230  -7  866  F4MBU G0ANS -07 (x2)
150230  +5  266  F4MBU F5CUN JN26 (x5)
151400 -18  865  F4MBU DL9YNG JN48
141315  +3  664  F4MBU SV1CQN -01 (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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