SP4AC — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving SP4AC, decoded by SO8OO in southeastern Poland. 16 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 4 UTC dates in the available aggregate history. Observed between 2026-08-05 and 2026-09-19.
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 16 FT8 messages attributed to SP4AC 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 (56%), followed by 20 m (44%). In this small sample, the estimated median decoder S/N was -15 dB; no usual signal pattern is inferred.
Overview
Bands
Last attributed message: 2026-09-19 09:14 UTC
Observed FT8 message patterns
- Attributed sample
- 16 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) 8, strong (≥ -8 dB) 1.
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 SP4AC 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 SP4AC
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
- KO13 · 5 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 405 km (approx.)
- Last such locator decoded
- 2026-09-19 09:14 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 | SP4AC S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-19 09:14 | 40m | -21 / - | TM35DCM | - / +4 | 2 | Partial capture |
| 09-19 09:10 | 40m | -7 / +6 | SO100PKP | -2 / - | 10 | Partial capture |
| 09-19 09:07 | 40m | -22 / - | MI0NWA | - / -2 | 2 | Partial capture |
| 09-08 18:14 | 40m | -13 / +1 | G5BOB | -12 / +2 | 3 | ✓ Full exchange observed |
| 09-08 16:08 | 40m | -13 / - | SP1ZBRS | - / -4 | 3 | Partial capture |
| 08-15 07:12 | 20m | -14 / - | EA1IOK | - / -19 | 3 | Partial capture |
| 08-15 07:11 | 20m | -16 / - | RX3ASQ | - / -13 | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 081830 +1 2401 SP4AC RR73; UR5TOC <...> -08 090745 -20 1731 MI0NWA SP4AC KO13 (x2) 091015 -7 548 SO100PKP SP4AC KO13 091030 -1 2547 SP4AC SO100PKP +06 (x8) 091415 -21 1547 TM35DCM SP4AC KO13 091430 -5 2547 SP4AC SO100PKP -06 091445 -21 1547 TM35DCM SP4AC R+04
UTC dB Audio Message 120145 -24 1878 CR5VP SP4AC KO13 120630 -24 1878 SP4AC RW6HPS LN15 071045 -16 1249 CQ SP4AC KO13 071115 -21 1249 RX3ASQ SP4AC -13 (x2) 071200 -7 1249 SP4AC RK4FF -11 071245 -14 1250 EA1IOK SP4AC -19 (x3)
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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