SP3SJ — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving SP3SJ, decoded by SO8OO in southeastern Poland. 11 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 7 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-10.
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 11 FT8 messages attributed to SP3SJ as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (82%), followed by 40 m (9%) and 10 m (9%). In this small sample, the estimated median decoder S/N was 0 dB; no usual signal pattern is inferred.
Overview
Bands
Last attributed message: 2026-09-10 10:14 UTC
Observed FT8 message patterns
- Attributed sample
- 11 messages
- Active dates
- 7 UTC dates
- Estimated median S/N
- 0 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 1, strong (≥ -8 dB) 10.
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 SP3SJ 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 SP3SJ
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
- JO71
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 508 km (approx.)
- Last such locator decoded
- 2026-06-08 09:47 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 | SP3SJ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-31 14:16 | 20m | - / - | 2E1HAT | -2 / - | 3 | Partial capture |
| 08-25 14:16 | 20m | - / -21 | F5IXN | +18 / - | 2 | ✓ Closing fragment |
| 08-08 12:34 | 20m | +3 / - | AD9GE | - / -15 | 2 | ✓ Closing fragment |
| 08-01 11:30 | 20m | - / - | PD1BJO | -11 / - | 2 | ✓ Closing fragment |
| 07-29 19:02 | 10m | - / +2 | IZ0ZIP | -4 / - | 2 | Partial capture |
| 07-13 09:33 | 20m | -2 / - | NL8F | - / -20 | 2 | Partial capture |
| 06-29 12:20 | 20m | -2 / - | DK5UR | - / -3 | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 101430 +3 629 SP1ZMO SP3SJ -17
UTC dB Audio Message 122115 -4 551 DK5UR SP3SJ RR73 093300 +0 496 NL8F SP3SJ -20 (x2) 183745 +8 405 BH2WTV SP3SJ -13 090145 -6 322 SP3SJ CT1AOZ 73 113045 -11 2104 SP3SJ PD1BJO JO32 (x2) 155830 -1 575 SP3SJ GU0SUP IN89 123430 +4 377 AD9GE SP3SJ -15 (x2) 141615 +17 427 SP3SJ F5IXN R-21 (x2) 141600 -3 499 SP3SJ 2E1HAT JO01 (x3)
UTC dB Audio Message 190245 -2 420 SP3SJ IZ0ZIP +02 (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.
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