S21SDR — 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 S21SDR, decoded by SO8OO in southeastern Poland. 4 FT8 messages attributed to this token as transmitter, on 80m, 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-07-09 and 2026-08-25.
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 4 FT8 messages attributed to S21SDR as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The available sample contains attributed decodes on 80 m (75%) and 20 m (25%). The sample is too small to infer a recurring UTC-hour or received-S/N pattern.
Overview
Bands
Last attributed message: 2026-08-25 15:02 UTC
Observed FT8 message patterns
- Attributed sample
- 4 messages
- Active dates
- 2 UTC dates
- S/N summary
- Too few decodes
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
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 S21SDR in decoded directed-looking exchanges:
Most frequent locator attributed to S21SDR
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 · 4 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 6,563 km (approx.)
- Last such locator decoded
- 2026-08-25 15:02 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 | S21SDR S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-17 18:01 | 40m | - / - | R2DAY | -19 / - | 2 | Partial capture |
| 10-17 18:00 | 40m | - / - | LZ2VQ | -6 / - | 2 | Partial capture |
| 10-17 17:59 | 40m | - / - | RZ1AS | -11 / - | 8 | Partial capture |
| 10-17 17:51 | 40m | - / - | LZ2VQ | -8 / - | 2 | Partial capture |
| 10-17 17:50 | 40m | - / -12 | R2PX | 0 / - | 3 | ✓ Closing fragment |
| 10-16 10:39 | 10m | - / - | F1UGD | -20 / - | 3 | Partial capture |
| 10-16 10:39 | 10m | - / - | EA3HKD | -13 / - | 3 | Partial capture |
| 10-16 10:36 | 10m | - / -11 | CT2IBL | +3 / - | 5 | ✓ Closing fragment |
| 10-16 10:28 | 10m | - / - | CT4KQ | -14 / - | 4 | Partial capture |
| 10-09 17:18 | 40m | - / -16 | Z31PM | -13 / - | 5 | Partial capture |
| 10-09 17:13 | 40m | - / -15 | IU7QBB | -3 / - | 4 | ✓ Closing fragment |
| 10-09 06:52 | 80m | - / - | DK1AQ | -3 / - | 14 | Partial capture |
| 10-08 18:51 | 80m | - / -15 | OH1MLZ | +12 / - | 3 | ✓ Closing fragment |
| 10-08 18:51 | 80m | - / -14 | OT7K | +11 / - | 11 | Partial capture |
| 10-08 18:51 | 80m | - / - | OK1YQ | +21 / - | 35 | Partial capture |
| 10-08 18:50 | 80m | - / - | R6ZQ | -8 / - | 7 | Partial capture |
| 10-08 18:47 | 80m | - / - | OH1MLZ | +18 / - | 2 | Partial capture |
| 10-08 18:46 | 80m | - / -12 | RW9JZ | -20 / - | 3 | ✓ Closing fragment |
| 10-08 18:27 | 40m | - / -17 | LZ2VQ | -3 / - | 4 | Partial capture |
| 10-08 18:26 | 40m | - / -17 | LX1JH | +18 / - | 3 | ✓ Closing fragment |
| 10-08 17:07 | 40m | - / -14 | UA4FKT | +6 / - | 3 | ✓ Closing fragment |
| 10-01 19:15 | 40m | - / - | RX3ASQ | -15 / - | 2 | Partial capture |
| 09-28 21:31 | 40m | - / - | RD6OZ | -4 / - | 2 | Partial capture |
| 09-28 21:23 | 40m | - / - | R5BM | -1 / - | 3 | Partial capture |
| 09-28 21:22 | 40m | - / - | RV6AVU | 0 / - | 2 | Partial capture |
| 09-28 21:22 | 40m | - / -14 | EB5AFK | -5 / - | 3 | ✓ Closing fragment |
| 09-28 21:22 | 40m | - / - | IZ8VYU | +4 / - | 2 | Partial capture |
| 09-28 18:37 | 40m | - / - | R1CF | 0 / - | 5 | Partial capture |
| 09-27 16:08 | 40m | - / - | RX9ABI | -6 / - | 2 | Partial capture |
| 09-27 16:08 | 40m | - / -21 | UN3G | -8 / - | 5 | ✓ Closing fragment |
| 09-25 21:00 | 40m | - / 0 | PE1MHY | -1 / - | 4 | Partial capture |
| 09-25 20:59 | 40m | - / - | IK3ERN | +3 / - | 2 | Partial capture |
| 09-23 18:58 | 40m | - / - | TF4M | -9 / - | 3 | Partial capture |
| 09-23 18:48 | 40m | - / - | OG5N | -10 / - | 3 | Partial capture |
| 09-23 18:46 | 40m | - / - | RD3FY | +6 / - | 3 | Partial capture |
| 09-23 18:46 | 40m | - / - | RZ4FWA | -13 / - | 4 | Partial capture |
| 09-23 18:46 | 40m | - / -17 | TF4M | -6 / - | 21 | Partial capture |
| 09-23 18:45 | 40m | - / - | RM4W | -14 / - | 2 | Partial capture |
| 09-22 17:13 | 40m | - / -17 | UA6AHR | -6 / - | 2 | Partial capture |
| 09-22 17:10 | 40m | - / -14 | LA6YEA | +6 / - | 6 | ✓ Closing fragment |
| 09-20 17:31 | 40m | - / - | RV1CC | -12 / - | 2 | Partial capture |
| 09-20 17:15 | 40m | - / -16 | UA0ACZ | -13 / - | 2 | ✓ Closing fragment |
| 09-17 19:09 | 80m | - / - | IZ6BRN | -6 / - | 2 | Partial capture |
| 09-17 19:08 | 80m | - / - | OK1YQ | +28 / - | 7 | Partial capture |
| 09-17 19:02 | 80m | - / -26 | DJ7M | +23 / - | 8 | ✓ Closing fragment |
| 09-16 19:31 | 80m | - / - | OK1YQ | +9 / - | 8 | Partial capture |
| 09-11 16:42 | 80m | - / - | OH6FSG | +4 / - | 4 | Partial capture |
| 09-11 16:41 | 80m | - / - | UF3T | +11 / - | 12 | Partial capture |
| 09-11 16:38 | 80m | - / - | DJ7M | +15 / - | 6 | Partial capture |
| 09-11 16:38 | 80m | - / - | OH6FSG | +6 / - | 4 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 175145 -7 2279 S21SDR LZ2VQ KN23 (x2) 175445 -1 2525 S21SDR R7ZY R-22 175915 -8 2174 S21SDR RZ1AS KO59 (x4) 180045 -2 2278 S21SDR LZ2VQ KN23 (x2) 180145 -9 2174 S21SDR RZ1AS KO59 180145 -15 2279 S21SDR R2DAY KO95 180215 -12 2174 S21SDR RZ1AS KO59 (x2) 180245 -23 2279 S21SDR R2DAY KO95 180315 -15 2174 S21SDR RZ1AS KO59
UTC dB Audio Message 102815 -18 2334 S21SDR CT4KQ IN60 (x4) 103645 +7 2416 S21SDR CT2IBL IM58 (x5) 103915 -11 1149 S21SDR EA3HKD JN11 103945 -21 2095 S21SDR F1UGD IN94 (x2) 104015 -14 1150 S21SDR EA3HKD JN11 104045 -19 2095 S21SDR F1UGD IN94 104045 -13 1150 S21SDR EA3HKD JN11
UTC dB Audio Message 191215 +25 622 S21SDR OK1YQ JN79 065215 -2 505 S21SDR DK1AQ JO43 (x14)
UTC dB Audio Message 154100 -18 2119 S21SDR BA5CW R-08 162815 -12 641 S21SDR R2AL KO85 171915 +4 1768 S21SDR IK4RUX JN54 172015 -17 1176 S21SDR RY3F RR73 150200 -24 1771 N1PPP S21SDR NL53 184545 -13 1770 S21SDR UA3AGW KO85 (x2) 191515 -14 3000 S21SDR PY1EME 73 191715 +6 2913 S21SDR F4BYA JN19 (x4) 192045 +0 2513 S21SDR IZ4TOA JN54 (x3)
CW
No CW receptions recorded for this callsign in the last 30 days.
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