KR4U — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving KR4U, decoded by SO8OO in southeastern Poland. 11 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 4 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-07-21.
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 KR4U as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (64%), followed by 80 m (36%). In this small sample, the estimated median decoder S/N was -13 dB; no usual signal pattern is inferred.
Overview
Bands
Last attributed message: 2026-07-21 01:54 UTC
Observed FT8 message patterns
- Attributed sample
- 11 messages
- Active dates
- 4 UTC dates
- Estimated median S/N
- -13 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 6, strong (≥ -8 dB) 0.
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 KR4U in decoded directed-looking exchanges:
Most frequent locator attributed to KR4U
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
- EL87 · 10 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 8,675 km (approx.)
- Last such locator decoded
- 2026-07-21 01:54 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 | KR4U S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 07-23 03:08 | 80m | - / - | HB9ALO | +3 / - | 2 | Partial capture |
| 07-18 02:21 | 80m | -18 / - | CE3OQA | - / - | 2 | Partial capture |
| 07-17 02:02 | 80m | - / - | W3XG | -17 / - | 2 | ✓ Closing fragment |
| 07-17 01:35 | 20m | - / - | EA1IOK | -8 / - | 2 | Partial capture |
| 07-17 01:30 | 20m | - / +3 | 9K2YM | -6 / - | 2 | ✓ Closing fragment |
| 07-14 02:09 | 20m | - / - | UR4QFP | -6 / - | 4 | Partial capture |
| 07-14 01:39 | 80m | - / -14 | CT7AUT | -16 / - | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 020130 -11 2578 KR4U R2EA -15
UTC dB Audio Message 013630 -24 1399 KR4U CT7AUT -15 (x3) 020215 -16 1987 KR4U W3XG +12 (x2) 021700 -22 804 CE3OQA KR4U EL87 (x3) 012430 -15 914 KR4U TN8GD -16 015430 -23 1624 HC1BG KR4U EL87 030815 +2 892 KR4U HB9ALO JN45 (x2)
UTC dB Audio Message 020915 -5 2567 KR4U UR4QFP KN77 (x4) 013030 -8 1221 KR4U 9K2YM +03 (x2) 013545 -8 537 KR4U EA1IOK IN62 (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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