ON4TH — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving ON4TH, decoded by SO8OO in southeastern Poland. 66 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, across 11 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-09-17.
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 66 FT8 messages attributed to ON4TH as the transmitting token by decoded message structure across 11 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (42%), followed by 60 m (29%) and 40 m (14%). Most decodes (73%) fell within the six-hour window 19:00-01:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (74%); the estimated median was +1 dB.
Overview
Bands
Last attributed message: 2026-09-17 20:11 UTC
Observed FT8 message patterns
- Attributed sample
- 66 messages
- Active dates
- 11 UTC dates
- Estimated median S/N
- +1 dB
- Estimated 10th-90th percentile
- -13 to +8 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 15, strong (≥ -8 dB) 49.
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 ON4TH 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 ON4TH
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 · 51 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,194 km (approx.)
- Last such locator decoded
- 2026-09-17 20:11 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 | ON4TH S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-15 13:01 | 20m | -12 / - | RI1FJZ | - / - | 2 | Partial capture |
| 09-04 20:37 | 160m | - / - | DL2JLB | -19 / - | 3 | ✓ Closing fragment |
| 09-04 20:33 | 160m | 0 / - | RI1FJL | - / - | 2 | Partial capture |
| 08-31 20:09 | 80m | +4 / - | V51WH | - / -7 | 5 | Partial capture |
| 08-30 00:21 | 80m | +3 / - | TI2JR | - / -20 | 13 | ✓ Closing fragment |
| 08-26 02:40 | 80m | +13 / - | HI3T | - / -11 | 3 | ✓ Closing fragment |
| 08-20 19:40 | 60m | -6 / -1 | OJ0JR | +2 / -8 | 4 | ✓ Full exchange observed |
| 08-10 05:35 | 40m | -12 / - | N0FX | - / - | 2 | Partial capture |
| 08-10 05:34 | 40m | -12 / - | K0SSD | - / - | 3 | Partial capture |
| 08-09 18:21 | 20m | -10 / -1 | D2ACE | -2 / - | 5 | ✓ Closing observed |
| 08-06 04:38 | 40m | -17 / - | OA4ENG | - / -6 | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 203345 +1 1566 RI1FJL ON4TH JO20 (x2) 203730 -16 2062 ON4TH DL2JLB JO60 (x3) 201145 -22 1594 RI1FJ ON4TH JO20
UTC dB Audio Message 161815 -14 2245 OX3LX ON4TH JO20 (x2) 182130 -10 2496 D2ACE ON4TH JO20 (x2) 182215 -2 2672 ON4TH D2ACE -01 (x2) 182300 -12 2497 D2ACE ON4TH 73 130115 -11 2539 RI1FJZ ON4TH JO20 (x2)
UTC dB Audio Message 043815 -15 2224 OA4ENG ON4TH R-06 (x2) 053230 -14 2459 <...> ON4TH JO20 053445 -12 2458 K0SSD ON4TH JO20 053545 -11 2458 N0FX ON4TH JO20 (x2) 053645 -14 2458 K0SSD ON4TH JO20 (x2) 200745 -6 1790 V51WH ON4TH JO20
UTC dB Audio Message 002445 +6 2542 TI2JR ON4TH JO20 (x9) 191115 -4 629 V51WH ON4TH JO20 (x6)
UTC dB Audio Message 194045 -8 731 OJ0JR ON4TH JO20 194100 +2 438 ON4TH OJ0JR -01 194115 -4 731 OJ0JR ON4TH R-08 194130 +4 378 ON4TH RR73; EA3JDI <OJ0JR> -10 194145 -5 731 OJ0JR ON4TH 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.
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