ON4ARJ — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving ON4ARJ, decoded by SO8OO in southeastern Poland. 16 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 10m, across 4 UTC dates in the available aggregate history. Observed between 2026-07-02 and 2026-08-08.
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 16 FT8 messages attributed to ON4ARJ as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 60 m (63%), followed by 40 m (19%) and 10 m (13%). In this small sample, the estimated median decoder S/N was -8 dB; no usual signal pattern is inferred.
Overview
Bands
Last attributed message: 2026-08-08 03:04 UTC
Observed FT8 message patterns
- Attributed sample
- 16 messages
- Active dates
- 4 UTC dates
- Estimated median S/N
- -8 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 4, moderate (-15 to -9 dB) 3, strong (≥ -8 dB) 9.
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 ON4ARJ in decoded directed-looking exchanges:
Most frequent locator attributed to ON4ARJ
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
- JO21 · 5 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,192 km (approx.)
- Last such locator decoded
- 2026-08-08 03:03 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 | ON4ARJ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-08 03:03 | 40m | -8 / - | OA4ENG | - / -9 | 3 | ✓ Closing fragment |
| 07-29 18:49 | 10m | -20 / - | Z61DX | - / - | 2 | Partial capture |
| 07-02 21:16 | 60m | -4 / -9 | DL9KM | -16 / -12 | 6 | ✓ Full exchange observed |
| 07-02 21:15 | 60m | -11 / -3 | OT4R | -9 / +5 | 3 | Partial capture |
| 07-02 21:12 | 60m | -7 / -8 | HB9EKJ | -10 / -5 | 6 | ✓ Full exchange observed |
| 07-02 21:12 | 60m | -9 / - | GW8CRH | - / +1 | 3 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 030300 -9 2512 OA4ENG ON4ARJ JO21 (x3)
UTC dB Audio Message 184900 -18 1472 Z61DX ON4ARJ JO21 (x2)
UTC dB Audio Message 214645 -13 1321 TN8GD ON4ARJ JO21
UTC dB Audio Message 211330 -7 1004 HB9EKJ ON4ARJ -05 211345 -7 252 ON4ARJ HB9EKJ R-08 211400 -7 1005 HB9EKJ ON4ARJ RR73 211415 -9 252 ON4ARJ HB9EKJ 73 211530 -18 1004 <...> ON4ARJ R+07 211545 -9 1392 ON4ARJ OT4R -03 211545 -19 1875 <ON4ARJ> DP75BAC RR73 211615 -19 1320 ON4ARJ DL9KM JN68 211630 -16 1004 OT4R ON4ARJ R+05 211645 -16 1320 ON4ARJ DL9KM JN68 211700 -6 1004 OT4R ON4ARJ R+05 211730 -8 1004 DL9KM ON4ARJ -12 211745 -16 1320 ON4ARJ DL9KM R-09 211800 -1 504 DL9KM ON4ARJ RR73 211815 -15 1320 ON4ARJ DL9KM 73
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.
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee