US4UU — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving US4UU, decoded by SO8OO in southeastern Poland. 11 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 4 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-03.
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 11 FT8 messages attributed to US4UU as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (91%), followed by 40 m (9%). In this small sample, the estimated median decoder S/N was -6 dB; no usual signal pattern is inferred.
Overview
Bands
Last attributed message: 2026-08-03 17:48 UTC
Observed FT8 message patterns
- Attributed sample
- 11 messages
- Active dates
- 4 UTC dates
- Estimated median S/N
- -6 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 2, strong (≥ -8 dB) 8.
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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).
Frequent counterpart tokens observed at SO8OO
Tokens most often paired with US4UU in decoded directed-looking exchanges:
Most frequent locator attributed to US4UU
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
- KO50 · 11 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 658 km (approx.)
- Last such locator decoded
- 2026-08-03 17:48 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 | US4UU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-03 17:47 | 20m | -11 / - | Z62NS | - / - | 2 | Partial capture |
| 07-18 19:49 | 20m | -4 / - | XV9T | - / - | 4 | Partial capture |
| 06-28 20:52 | 10m | - / -12 | IK1RQX | +10 / - | 5 | ✓ Closing fragment |
| 06-28 20:43 | 10m | - / -19 | CE2SV | +3 / - | 2 | ✓ Closing fragment |
| 06-28 20:13 | 10m | - / -6 | SV2CLJ | +1 / - | 3 | ✓ Closing fragment |
| 06-28 20:09 | 10m | - / - | UR3QKC | -2 / - | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 194900 -6 965 XV9T US4UU KO50 (x4) 173930 -17 2138 MD0RTZ US4UU KO50 174630 -6 2570 BG4UCZ US4UU KO50 174730 -13 2570 Z62NS US4UU KO50 (x2)
UTC dB Audio Message 195615 -24 1858 US4UU YU5DR RR73 200045 -18 2188 US4UU PD1HPB JO22 200900 -1 1600 US4UU UR3QKC KN77 200900 -7 957 US4UU DL8NW JO30 200930 -4 1600 US4UU UR3QKC KN77 201330 -3 604 US4UU SV2CLJ KN10 (x3) 204345 +4 2671 US4UU CE2SV -19 (x2) 205245 +9 2617 US4UU IK1RQX JN44 (x5)
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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