F4CZK — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving F4CZK, decoded by SO8OO in southeastern Poland. 26 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 6 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-08-29.
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 26 FT8 messages attributed to F4CZK as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 10 m (65%), followed by 20 m (31%) and 40 m (4%). Several six-hour UTC windows tied for the largest share (81%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.
Overview
Bands
Last attributed message: 2026-08-29 09:47 UTC
Observed FT8 message patterns
- Attributed sample
- 26 messages
- Active dates
- 6 UTC dates
- Estimated median S/N
- -14 dB
- Estimated 10th-90th percentile
- -18 to -6 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 9, moderate (-15 to -9 dB) 12, 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.
Frequent counterpart tokens observed at SO8OO
Tokens most often paired with F4CZK 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 F4CZK
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
- JN18 · 23 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,370 km (approx.)
- Last such locator decoded
- 2026-08-29 09:47 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 | F4CZK S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-29 09:47 | 20m | -20 / - | RZ1OA | - / - | 2 | Partial capture |
| 08-27 14:45 | 20m | -8 / - | A61FJ | - / - | 2 | Partial capture |
| 07-28 20:39 | 20m | -1 / 0 | CT2HVF | +12 / - | 3 | ✓ Closing observed |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 203630 -13 1319 IU2KXJ F4CZK JN18 203730 -8 1599 W1AW/4 F4CZK JN18 203915 +12 390 F4CZK CT2HVF +00 (x2) 204000 -1 391 CT2HVF F4CZK 73 212100 -13 525 F4CZK RR73; DL5AWR <...> -04 144515 -15 2318 A61FJ F4CZK JN18 (x2) 094300 -16 1430 R4AAR F4CZK JN18 094700 -20 1912 RZ1OA F4CZK JN18 (x2)
UTC dB Audio Message 213500 -5 2333 F4CZK CN8NS -17 213530 -1 2333 F4CZK RR73; OK1AWC <...> -14 213645 -16 1739 YU2MMT F4CZK JN18
UTC dB Audio Message 175030 -11 2581 PU3PAT F4CZK R-24 180315 -8 2763 F1BAY F4CZK R-06
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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