ON4JM — 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 ON4JM, decoded by SO8OO in southeastern Poland. 15 FT8 messages attributed to this token as transmitter, on 60m, 40m, across 4 UTC dates in the available aggregate history. Observed between 2026-09-29 and 2026-10-23.
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 15 FT8 messages attributed to ON4JM 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 (93%), followed by 60 m (7%). In this small sample, the estimated median decoder S/N was -15 dB; no usual signal pattern is inferred.
Overview
Bands
Last attributed message: 2026-10-23 12:23 UTC
Observed FT8 message patterns
- Attributed sample
- 15 messages
- Active dates
- 4 UTC dates
- Estimated median S/N
- -15 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 7, moderate (-15 to -9 dB) 6, strong (≥ -8 dB) 2.
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 ON4JM in decoded directed-looking exchanges:
Most frequent locator attributed to ON4JM
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 · 6 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,194 km (approx.)
- Last such locator decoded
- 2026-10-23 12:22 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 | ON4JM S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-23 12:22 | 40m | -12 / -12 | SP9UPH | +4 / - | 5 | ✓ Closing observed |
| 10-18 17:03 | 60m | - / - | DL5NDA | 0 / - | 2 | Partial capture |
| 10-01 08:45 | 40m | - / -16 | HA7TM | +12 / - | 4 | ✓ Closing fragment |
| 10-01 08:39 | 40m | -16 / - | W8WEJ | - / -21 | 5 | Partial capture |
| 09-29 14:51 | 40m | -14 / 0 | OP4F | -20 / - | 2 | Partial capture |
| 09-29 14:48 | 40m | -24 / +3 | DL7FAI | -6 / +7 | 6 | ✓ Full exchange observed |
| 09-29 14:47 | 40m | -16 / - | PD3CFG | - / -7 | 3 | Partial capture |
| 09-29 14:46 | 40m | - / - | HG8LXL | -2 / - | 2 | Partial capture |
| 09-29 14:46 | 40m | - / - | IU2THY | 0 / - | 3 | Partial capture |
| 09-29 14:44 | 40m | - / +5 | DK7ZT | -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 083930 -21 1920 W8WEJ ON4JM JO20 (x5) 084515 +12 700 ON4JM HA7TM JN97 (x4) 122215 +1 755 ON4JM SP9UPH JO90 122230 -11 679 CQ ON4JM JO20 122245 +5 755 ON4JM SP9UPH JO90 (x2) 122330 -12 680 SP9UPH ON4JM RRR 122345 +6 755 ON4JM SP9UPH 73
UTC dB Audio Message 170245 -7 868 CQ ON4JM JO20 170330 -3 867 ON4JM DL5NDA JN59 (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.
CW
No CW receptions recorded for this callsign in the last 30 days.
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