F4EFZ — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving F4EFZ, 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 2026-08-31.
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 F4EFZ 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 -10 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
- -10 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 7, strong (≥ -8 dB) 2.
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 F4EFZ in decoded directed-looking exchanges:
Most frequent locator attributed to F4EFZ
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
- JN17 · 5 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,401 km (approx.)
- Last such locator decoded
- 2026-08-31 17:57 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 | F4EFZ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-31 17:44 | 20m | -7 / - | IU7VOL | - / -12 | 3 | ✓ Closing fragment |
| 08-31 17:39 | 20m | -12 / -9 | R3NCG | -5 / +6 | 4 | ✓ Full exchange observed |
| 08-31 17:26 | 20m | -10 / - | SP7OK | - / +10 | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 172145 -11 2084 R3NCG F4EFZ JN17 172615 -10 1047 SP7OK F4EFZ JN17 (x2) 173915 -14 1298 R3NCG F4EFZ JN17 173930 -5 1297 F4EFZ R3NCG -09 173945 -12 1297 R3NCG F4EFZ R+06 (x2) 174430 -9 868 IU7VOL F4EFZ JN17 (x3) 175715 -20 993 DL7HS F4EFZ JN17
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee