YU5BU — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving YU5BU, decoded by SO8OO in southeastern Poland. 229 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 12 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-08-12.
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 229 FT8 messages attributed to YU5BU as the transmitting token by decoded message structure across 12 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (82%), followed by 10 m (18%). Most decodes (61%) fell within the six-hour window 19:00-01:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10.2 dB.
Overview
Bands
Last attributed message: 2026-08-12 05:22 UTC
Observed FT8 message patterns
- Attributed sample
- 229 messages
- Active dates
- 12 UTC dates
- Estimated median S/N
- -10.2 dB
- Estimated 10th-90th percentile
- -19 to +8 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 71, moderate (-15 to -9 dB) 52, strong (≥ -8 dB) 106.
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 YU5BU 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 YU5BU
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
- KN03 · 120 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 718 km (approx.)
- Last such locator decoded
- 2026-08-12 05:22 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 | YU5BU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-12 05:21 | 20m | -13 / - | VK4MA | - / - | 3 | Partial capture |
| 08-12 04:46 | 20m | -14 / - | YO8RSL | -13 / -18 | 3 | Partial capture |
| 08-12 04:40 | 20m | -16 / - | ZL3BWE | - / -13 | 5 | ✓ Closing fragment |
| 08-12 04:37 | 20m | -14 / - | TA2EE | - / - | 2 | ✓ Closing fragment |
| 08-12 04:33 | 20m | -17 / - | UA9QFF | - / -23 | 3 | Partial capture |
| 08-12 04:26 | 20m | -16 / - | ZL1HX | - / - | 2 | ✓ Closing fragment |
| 08-12 04:23 | 20m | -17 / - | VK3BD | - / - | 3 | ✓ Closing fragment |
| 08-12 04:18 | 20m | -17 / - | UN8PC | - / -20 | 4 | ✓ Closing fragment |
| 08-12 04:12 | 20m | -14 / - | K6IL | - / -19 | 5 | ✓ Closing fragment |
| 08-12 03:59 | 20m | - / -13 | R3IX | -17 / - | 2 | Partial capture |
| 08-11 21:07 | 20m | -16 / -8 | LU6FOV | -14 / -23 | 6 | ✓ Full exchange observed |
| 08-11 21:05 | 20m | -13 / - | 9A3K | +6 / -11 | 4 | ✓ Closing observed |
| 08-11 21:04 | 20m | -16 / - | EA1FUB | -12 / -18 | 3 | ✓ Closing observed |
| 08-11 21:03 | 20m | -14 / +9 | WF2A | +2 / -14 | 4 | ✓ Full exchange observed |
| 08-11 20:34 | 10m | - / -15 | CE2SV | -2 / - | 2 | ✓ Closing fragment |
| 08-11 16:33 | 20m | - / -9 | F5IXN | -16 / - | 2 | Partial capture |
| 08-10 17:23 | 20m | -15 / -12 | JH0INP | -9 / - | 4 | Partial capture |
| 08-10 06:47 | 10m | - / -13 | R2EA | -14 / - | 2 | ✓ Closing fragment |
| 08-07 22:46 | 20m | - / +1 | 7X5CY | -2 / - | 2 | ✓ Closing fragment |
| 08-07 11:55 | 20m | - / - | YO5PHL | -15 / - | 2 | Partial capture |
| 08-07 11:48 | 20m | - / -9 | EB3JT | -6 / - | 3 | Partial capture |
| 08-06 22:37 | 20m | -14 / - | VE9RA | - / - | 2 | Partial capture |
| 08-06 22:34 | 20m | - / - | DL3NA | -6 / - | 2 | ✓ Closing fragment |
| 08-06 22:33 | 20m | -17 / - | JP1LRT | - / -23 | 3 | ✓ Closing fragment |
| 08-06 22:21 | 20m | -19 / - | JI2FBG | - / - | 2 | ✓ Closing fragment |
| 08-06 19:45 | 20m | - / -10 | JA0LFV | -8 / - | 3 | ✓ Closing fragment |
| 08-04 22:51 | 20m | -15 / - | N1JUD | - / -13 | 3 | ✓ Closing fragment |
| 08-04 22:45 | 20m | -16 / -15 | DL2FX | -17 / -16 | 4 | ✓ Full exchange observed |
| 08-04 22:43 | 20m | - / -3 | OK2CNI | +8 / - | 6 | Partial capture |
| 08-04 05:29 | 20m | -18 / - | VK3LV | - / -18 | 2 | ✓ Closing fragment |
| 08-02 19:12 | 10m | - / +10 | CT3MD | 0 / - | 2 | ✓ Closing fragment |
| 08-01 13:33 | 10m | -11 / - | YE4FHY | - / - | 2 | Partial capture |
| 08-01 13:32 | 10m | -10 / - | YE1BKB | - / - | 2 | Partial capture |
| 08-01 13:31 | 10m | -18 / - | YD9AGP | - / - | 2 | Partial capture |
| 08-01 13:23 | 10m | -21 / - | V51MA | - / - | 2 | Partial capture |
| 07-27 23:46 | 20m | - / +5 | V31MA | -13 / - | 3 | ✓ Closing fragment |
| 07-27 23:38 | 20m | - / -16 | YV5WL | -16 / - | 2 | ✓ Closing fragment |
| 07-26 22:31 | 20m | -20 / - | BG2ATH | - / -23 | 5 | Partial capture |
| 07-26 22:28 | 20m | -19 / - | WV2B | - / -13 | 3 | Partial capture |
| 07-26 17:06 | 10m | -17 / - | J69DS | - / - | 3 | Partial capture |
| 07-26 17:01 | 10m | -22 / - | PY2DS | - / - | 3 | Partial capture |
| 07-26 16:57 | 10m | -23 / - | PU6PSK | - / - | 3 | Partial capture |
| 07-26 16:50 | 10m | - / -5 | TA3V | -18 / - | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 043800 -13 2083 TA2EE YU5BU KN03 043900 -13 2083 VK5RM YU5BU KN03 044045 -16 2083 ZL3BWE YU5BU KN03 (x5) 044430 -15 2083 <EY35S> YU5BU KN03 044615 -10 1449 YU5BU YO8RSL KN37 (x2) 044730 -14 2083 YO8RSL YU5BU -18 045945 -17 2083 N8HRZ YU5BU KN03 052115 -8 2084 VK4MA YU5BU KN03 (x3)
UTC dB Audio Message 132930 -24 2127 YC2OEI YU5BU 73 133145 -20 2124 YD9AGP YU5BU KN03 (x2) 133245 -9 2125 YE1BKB YU5BU KN03 (x2) 133345 -11 2125 YE4FHY YU5BU KN03 (x2) 191015 -24 1780 YU5BU EA8UP -14 191230 -1 917 YU5BU CT3MD +10 (x2) 202245 -13 898 YU5BU PP2RR -12 064715 -13 2138 YU5BU R2EA -13 (x2) 203400 -3 2601 YU5BU CE2SV -15 (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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