ON7UDM — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving ON7UDM, decoded by SO8OO in southeastern Poland. 27 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 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 27 FT8 messages attributed to ON7UDM as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -14 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 27 messages
- Active dates
- 1 UTC dates
- Estimated median S/N
- -14 dB
- Estimated 10th-90th percentile
- -16 to -11 dB
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 4, moderate (-15 to -9 dB) 23, 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 ON7UDM in decoded directed-looking exchanges:
Most frequent locator attributed to ON7UDM
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 · 8 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,192 km (approx.)
- Last such locator decoded
- 2026-07-21 12:58 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 | ON7UDM S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 07-21 09:13 | 20m | -12 / - | R4IK | - / -14 | 2 | ✓ Closing fragment |
| 07-21 09:13 | 20m | - / - | RA6OV | -4 / - | 2 | Partial capture |
| 07-21 09:12 | 20m | - / -15 | R4FDW | -19 / - | 5 | Partial capture |
| 07-21 09:06 | 20m | -12 / - | F1PPH | - / +1 | 2 | ✓ Closing fragment |
| 07-21 09:01 | 20m | - / +4 | GJ0KYZ | -17 / - | 3 | Partial capture |
| 07-21 09:01 | 20m | -15 / - | PD3LKN | -15 / -21 | 9 | Partial capture |
| 07-21 08:58 | 20m | -12 / - | DG6TOM | - / +6 | 2 | ✓ Closing fragment |
| 07-21 08:58 | 20m | -15 / - | 9A5AGN | -18 / - | 3 | ✓ Closing observed |
| 07-21 08:58 | 20m | - / - | PD3LKN | -9 / - | 3 | Partial capture |
| 07-21 08:56 | 20m | -13 / - | M7VME | - / -25 | 2 | ✓ Closing fragment |
| 07-21 08:51 | 20m | -16 / - | DL9YNG | - / +8 | 2 | ✓ Closing fragment |
| 07-21 08:50 | 20m | -15 / +2 | DL9UXF | -10 / - | 2 | ✓ Closing observed |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 090645 -10 831 F1PPH ON7UDM RR73 090715 -12 831 CQ ON7UDM JO21 090845 -18 831 F4BJN ON7UDM RR73 090945 -17 832 CQ ON7UDM JO21 091200 -18 1598 ON7UDM R4FDW -15 (x3) 091315 -14 831 CQ ON7UDM JO21 091330 -5 831 ON7UDM RA6OV KN87 091330 -17 1599 ON7UDM R4FDW -15 091345 -14 832 R4IK ON7UDM R-14 091400 -4 831 ON7UDM RA6OV KN87 091400 -23 1599 ON7UDM R4FDW -15 091415 -11 831 R4IK ON7UDM 73 125845 -13 834 CQ ON7UDM JO21
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