K3JSJ — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving K3JSJ, decoded by SO8OO in southeastern Poland. 36 FT8 messages attributed to this token as transmitter, on 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-08 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 36 FT8 messages attributed to K3JSJ as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.
Overview
Observed FT8 message patterns
- Attributed sample
- 36 messages
- Active dates
- 5 UTC dates
- Estimated median S/N
- -12 dB
- Estimated 10th-90th percentile
- -20 to -8 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 11, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 6.
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 K3JSJ in decoded directed-looking exchanges:
Most frequent locator attributed to K3JSJ
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
- FM18 · 20 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 7,390 km (approx.)
- Last such locator decoded
- 2026-08-25 23:41 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 | K3JSJ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-15 00:54 | 40m | - / -11 | OS4K | -12 / - | 2 | Partial capture |
| 09-15 00:51 | 40m | - / - | PC2J | +10 / - | 5 | Partial capture |
| 09-11 23:42 | 40m | - / - | F4BYA | +10 / - | 3 | Partial capture |
| 09-11 23:42 | 40m | - / +6 | GM6URC | -16 / - | 3 | Partial capture |
| 08-27 01:14 | 20m | - / -14 | 7Z1DJ | -15 / - | 5 | Partial capture |
| 08-25 23:18 | 20m | -19 / - | TA3F | - / -19 | 3 | ✓ Closing fragment |
| 08-25 23:15 | 20m | -10 / - | K5RSB | - / -14 | 2 | ✓ Closing fragment |
| 08-24 23:40 | 20m | - / - | 5Z4VJ | -6 / - | 3 | Partial capture |
| 08-24 22:05 | 20m | - / - | IU2UDS | -14 / - | 2 | Partial capture |
| 08-24 22:05 | 20m | - / -17 | PA1AA | -19 / - | 7 | ✓ Closing fragment |
| 08-24 22:01 | 20m | - / - | IZ0GRR | -18 / - | 6 | Partial capture |
| 08-12 00:12 | 40m | - / - | UR5SD | +13 / - | 2 | Partial capture |
| 08-11 23:51 | 40m | - / -21 | GB64MOD | -13 / - | 3 | Partial capture |
| 07-23 03:54 | 40m | - / -12 | DL3MIB | -5 / - | 11 | Partial capture |
| 07-14 01:33 | 40m | - / 0 | W4DXM | -5 / - | 3 | ✓ Closing fragment |
| 07-06 22:48 | 20m | - / - | I3QDK | -7 / - | 4 | Partial capture |
| 07-06 22:42 | 20m | - / -7 | IK4LZH | -7 / - | 3 | ✓ Closing fragment |
| 07-05 21:20 | 20m | - / - | DL1R | -7 / - | 7 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 234230 +8 2981 K3JSJ F4BYA JN19 234300 -16 1812 K3JSJ GM6URC +06 234300 +9 2981 K3JSJ F4BYA JN19 234330 -18 1812 K3JSJ GM6URC +06 234330 +13 2981 K3JSJ F4BYA JN19 232030 -8 2698 K3JSJ MI7XHT IO64 (x2) 005145 +9 493 K3JSJ PC2J JO22 (x5) 005415 -11 1582 K3JSJ OS4K -11 (x2) 012530 -14 2299 K3JSJ MI7XHT IO64
UTC dB Audio Message 234115 -6 2124 K3JSJ 5Z4VJ KI88 231400 -8 1329 W6NMW K3JSJ FM18 231430 -9 1329 CQ K3JSJ FM18 231500 -10 1329 K5RSB K3JSJ -14 (x2) 231830 -18 1329 TA3F K3JSJ -19 (x3) 232030 -22 1329 N6VMO K3JSJ FM18 234130 -9 765 F4HTA K3JSJ FM18 011445 -12 1281 K3JSJ 7Z1DJ -14 (x5)
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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