S21IM — 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 S21IM, decoded by SO8OO in southeastern Poland. 23 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-06-12 and 2026-06-13.
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 23 FT8 messages attributed to S21IM as the transmitting token by decoded message structure across 2 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 -19 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 23 messages
- Active dates
- 2 UTC dates
- Estimated median S/N
- -19 dB
- Estimated 10th-90th percentile
- -23 to -15 dB
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 19, moderate (-15 to -9 dB) 4, 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 S21IM in decoded directed-looking exchanges:
Most frequent locator attributed to S21IM
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
- NL53 · 18 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 6,563 km (approx.)
- Last such locator decoded
- 2026-06-13 15:24 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 | S21IM S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-31 18:41 | 20m | - / - | YB6XFI | -19 / - | 3 | Partial capture |
| 08-29 17:36 | 20m | - / - | ON5RZ | 0 / - | 15 | Partial capture |
| 08-29 16:50 | 20m | - / - | DJ3JD | +1 / - | 5 | Partial capture |
| 08-29 16:48 | 20m | - / - | IV3DSG | -5 / - | 5 | Partial capture |
| 08-29 16:31 | 20m | - / -14 | F1DJY | +6 / - | 3 | Partial capture |
| 08-29 16:22 | 20m | - / - | YH8AC | -22 / - | 2 | Partial capture |
| 08-27 11:15 | 20m | - / -12 | UA3GX | -1 / - | 12 | Partial capture |
| 08-25 14:18 | 20m | - / -25 | BG8NQ | -18 / - | 3 | ✓ Closing fragment |
| 08-25 13:35 | 20m | - / - | BD8CUC | -20 / - | 2 | Partial capture |
| 08-12 23:37 | 20m | - / - | DL2DT | -8 / - | 3 | Partial capture |
| 08-12 23:26 | 20m | - / - | F6EKI | -5 / - | 4 | Partial capture |
| 08-12 19:04 | 20m | - / - | KB1PA | -10 / - | 3 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 173745 +1 2538 S21IM ON5RZ JO21 (x12) 184145 -18 2004 S21IM YB6XFI NJ93 (x3)
CW
No CW receptions recorded for this callsign in the last 30 days.
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