DO4ZH — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving DO4ZH, decoded by SO8OO in southeastern Poland. 61 FT8 messages attributed to this token as transmitter, on 10m, across 9 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-07-23.
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 61 FT8 messages attributed to DO4ZH as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 10 m (100%). Most decodes (70%) fell within the six-hour window 09:00-15:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.
Overview
Observed FT8 message patterns
- Attributed sample
- 61 messages
- Active dates
- 9 UTC dates
- Estimated median S/N
- -13 dB
- Estimated 10th-90th percentile
- -21 to -6 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 26, moderate (-15 to -9 dB) 18, strong (≥ -8 dB) 17.
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 DO4ZH 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 DO4ZH
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
- JO64 · 50 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 784 km (approx.)
- Last such locator decoded
- 2026-07-23 12:39 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 | DO4ZH S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 07-27 13:52 | 10m | - / +8 | F4ILK | -10 / - | 5 | ✓ Closing fragment |
| 07-24 12:48 | 10m | - / - | HB9ENR | -8 / - | 3 | Partial capture |
| 07-23 12:38 | 10m | -22 / - | 9A3NM | - / - | 2 | Partial capture |
| 07-19 08:08 | 10m | -12 / -14 | R6YA | -13 / - | 3 | Partial capture |
| 07-19 08:06 | 10m | -16 / - | SV7BAY | - / - | 2 | Partial capture |
| 07-19 07:57 | 10m | -17 / -15 | RO3ZR | -2 / -3 | 7 | ✓ Full exchange observed |
| 07-19 07:43 | 10m | -23 / - | UR3VKB | -20 / -5 | 3 | ✓ Closing observed |
| 07-14 15:32 | 10m | - / - | TM19TFR | -4 / - | 2 | Partial capture |
| 07-12 08:02 | 10m | - / -16 | SV7CFP | -18 / - | 2 | ✓ Closing fragment |
| 07-11 08:33 | 10m | - / +1 | F1PBZ | +1 / - | 3 | Partial capture |
| 06-26 14:56 | 10m | -14 / - | LU2EI | - / - | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 080945 -13 2163 DO4ZH R6YA -14 123815 -23 2169 9A3NM DO4ZH JO64 (x2) 124830 -5 1480 DO4ZH HB9ENR JN47 (x3) 150445 -3 972 DO4ZH S55A JN65 135230 -8 2522 DO4ZH F4ILK +08 (x5) 084100 -24 1629 DO4ZH EA5DKT +01 095300 -14 2403 DO4ZH IU0VOG RR73 093600 +7 2739 DO4ZH F1PBZ RR73
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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