ON4DU — reception at SO8OO
Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.
FT8 activity
Receiver-side FT8 activity involving ON4DU, decoded by SO8OO in southeastern Poland. 29 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 7 UTC dates in the available aggregate history. Observed between 2026-06-30 and 2026-10-07.
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 29 FT8 messages attributed to ON4DU as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (83%), followed by 40 m (14%) and 10 m (3%). Several six-hour UTC windows tied for the largest share (86%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -6 dB.
Overview
Bands
Last attributed message: 2026-10-07 06:13 UTC
Observed FT8 message patterns
- Attributed sample
- 29 messages
- Active dates
- 7 UTC dates
- Estimated median S/N
- -6 dB
- Estimated 10th-90th percentile
- -16 to -1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 9, strong (≥ -8 dB) 17.
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 ON4DU 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 ON4DU
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
- JO20 · 23 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,194 km (approx.)
- Last such locator decoded
- 2026-10-07 06:13 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 | ON4DU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-06 17:20 | 40m | -2 / - | 9V1PL | - / - | 2 | Partial capture |
| 08-26 07:03 | 20m | -3 / - | 5N0YEN | - / - | 4 | Partial capture |
| 08-26 06:59 | 20m | -4 / - | WB6UNG | - / - | 3 | Partial capture |
| 08-26 06:57 | 20m | -5 / - | FK8HC | - / - | 3 | Partial capture |
| 08-22 06:44 | 20m | -14 / - | TI5RR | - / - | 2 | Partial capture |
| 08-22 06:12 | 20m | -7 / - | XQ1KK | - / -23 | 7 | ✓ Closing fragment |
| 08-17 06:14 | 20m | - / - | RV6F | -10 / - | 5 | Partial capture |
| 08-12 06:21 | 20m | - / - | DK3TNA | -5 / - | 3 | Partial capture |
| 08-12 06:11 | 20m | - / - | DK3TNA | -4 / - | 12 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 172030 -2 810 9V1PL ON4DU JO20 (x2) 172330 -4 810 7X1NSS ON4DU -16 061315 -18 811 OA4ENG ON4DU JO20
UTC dB Audio Message 163530 -16 868 HK3X ON4DU JO20
UTC dB Audio Message 061515 -8 850 XQ1KK ON4DU R-23 (x2) 064400 -14 850 TI5RR ON4DU JO20 (x2) 065715 -12 851 FK8HC ON4DU JO20 (x3) 065930 -1 852 WB6UNG ON4DU JO20 (x3) 070330 -3 851 5N0YEN ON4DU JO20 (x4) 061400 -3 729 ON4DU Z62NS -01
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.
CW
No CW receptions recorded for this callsign in the last 30 days.
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