YO9SW — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving YO9SW, decoded by SO8OO in southeastern Poland. 10 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-07-05.
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 10 FT8 messages attributed to YO9SW as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -9 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 10 messages
- Active dates
- 1 UTC dates
- Estimated median S/N
- -9 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) 5, strong (≥ -8 dB) 5.
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 YO9SW in decoded directed-looking exchanges:
Most frequent locator attributed to YO9SW
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
- KN23 · 4 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 756 km (approx.)
- Last such locator decoded
- 2026-07-05 17:42 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 | YO9SW S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 07-30 18:48 | 10m | - / -1 | DL8NW | -12 / - | 3 | Partial capture |
| 07-30 18:34 | 10m | - / -1 | EA8UP | -18 / - | 2 | ✓ Closing fragment |
| 07-30 18:10 | 10m | - / - | IU5TPM | -16 / - | 2 | Partial capture |
| 07-30 18:06 | 10m | - / +6 | DN9MRB | -12 / - | 2 | Partial capture |
| 07-30 18:01 | 10m | - / - | PA3ADU | 0 / - | 2 | ✓ Closing fragment |
| 07-05 17:40 | 20m | -11 / - | HS5NMF | - / -5 | 4 | ✓ Closing fragment |
| 07-05 17:39 | 20m | -4 / - | G4NSO | - / -10 | 2 | ✓ Closing fragment |
| 07-05 17:35 | 20m | -2 / - | LX2ZZ | -10 / -10 | 5 | ✓ Closing observed |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 175030 -21 1185 YO9SW DN9DSP RR73 180115 +1 2424 YO9SW PA3ADU +19 (x2) 180600 -12 1049 YO9SW DN9MRB +06 (x2) 180945 -20 1645 YO9SW PA3ANT RR73 181045 -16 1431 YO9SW IU5TPM JN53 (x2) 183400 -18 1778 YO9SW EA8UP -01 (x2) 184800 -10 834 YO9SW DL8NW -01 (x3)
UTC dB Audio Message 173545 -10 1083 LX2ZZ YO9SW KN23 (x3) 173700 -10 2690 YO9SW LX2ZZ RR73 173715 +2 1084 LX2ZZ YO9SW 73 173915 +0 1084 G4NSO YO9SW -10 (x2) 174045 -13 1084 HS5NMF YO9SW KN23 (x4)
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