ES4SA — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving ES4SA, decoded by SO8OO in southeastern Poland. 48 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-08-24 and 2026-09-15.
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 48 FT8 messages attributed to ES4SA as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (69%), followed by 40 m (31%). Several six-hour UTC windows tied for the largest share (52%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (63%); the estimated median was -5 dB.
Overview
Bands
Last attributed message: 2026-09-15 15:41 UTC
Observed FT8 message patterns
- Attributed sample
- 48 messages
- Active dates
- 6 UTC dates
- Estimated median S/N
- -5 dB
- Estimated 10th-90th percentile
- -18 to +11 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 10, moderate (-15 to -9 dB) 8, strong (≥ -8 dB) 30.
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.
Frequent counterpart tokens observed at SO8OO
Tokens most often paired with ES4SA 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 ES4SA
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
- KO49 · 25 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,158 km (approx.)
- Last such locator decoded
- 2026-08-31 15:30 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 | ES4SA S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-15 15:39 | 40m | -4 / - | R9HDU | - / -9 | 4 | Partial capture |
| 09-15 15:35 | 40m | -6 / - | YD1HFH | - / -22 | 3 | ✓ Closing fragment |
| 08-31 15:29 | 40m | -17 / - | YD2VTS | - / -15 | 3 | Partial capture |
| 08-31 15:23 | 40m | -22 / - | RA9LL | - / -9 | 2 | ✓ Closing fragment |
| 08-28 08:47 | 20m | +11 / - | NL8F | - / - | 5 | Partial capture |
| 08-28 08:46 | 20m | +11 / - | VK6OX | - / -14 | 3 | ✓ Closing fragment |
| 08-28 08:38 | 20m | -2 / - | 9Y4DG | - / -22 | 7 | ✓ Closing fragment |
| 08-28 08:36 | 20m | +10 / - | SA7BKX | - / - | 4 | Partial capture |
| 08-27 16:27 | 20m | -3 / - | AC4SP | - / - | 3 | Partial capture |
| 08-27 16:27 | 20m | -17 / - | F5IXN | +2 / -2 | 7 | Partial capture |
| 08-27 16:25 | 20m | - / -8 | 4X1UF | -2 / - | 2 | ✓ Closing fragment |
| 08-27 16:24 | 20m | -11 / - | R6LMH | - / - | 2 | Partial capture |
| 08-26 05:46 | 40m | - / -4 | F6FHZ | -19 / - | 2 | Partial capture |
| 08-26 05:42 | 40m | - / - | PD1ADA | -12 / - | 9 | Partial capture |
| 08-26 05:42 | 40m | - / -7 | G1CEC | -22 / - | 3 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 054745 -19 1327 ES4SA F6FHZ R-04 054845 -8 2291 ES4SA PE1NPS JO22 152330 -22 1315 RA9LL ES4SA R-09 (x2) 152615 +4 1316 ES4SA US2YW KN28 152930 -14 1315 YD2VTS ES4SA KO49 (x3) 153530 -10 1317 YD1HFH ES4SA R-22 (x3) 153930 -1 1317 R9HDU ES4SA -09 (x4)
UTC dB Audio Message 084100 +1 1286 9Y4DG ES4SA 73 084115 -4 1285 ES4SA PA0ARR +13 084130 +1 1286 9Y4DG ES4SA 73 084430 +9 1287 NL8F ES4SA KO49 084600 +8 1227 VK6OX ES4SA -14 (x3) 084715 -10 1508 ES4SA UA6AOP KN95 084730 +10 1227 NL8F ES4SA KO49 (x5) 085300 -10 1226 R8LCP ES4SA KO49 085430 -6 1226 R9HEP ES4SA R-11
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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