W4ZTH — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving W4ZTH, decoded by SO8OO in southeastern Poland. 10 FT8 messages attributed to this token as transmitter, on 40m, across 1 UTC dates in the available aggregate history. Last observed 2026-09-03.
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 W4ZTH as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (100%). In this small sample, the estimated median decoder S/N was -8 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
- -8 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) 2, strong (≥ -8 dB) 8.
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 W4ZTH in decoded directed-looking exchanges:
Most frequent locator attributed to W4ZTH
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
- EL89 · 5 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 8,504 km (approx.)
- Last such locator decoded
- 2026-09-03 23:52 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 | W4ZTH S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-03 23:52 | 40m | -5 / - | EK/RX3DPK | - / -9 | 2 | Partial capture |
| 09-03 23:43 | 40m | - / - | EB3JT | -14 / - | 2 | Partial capture |
| 09-03 23:41 | 40m | -9 / - | Z31B | -14 / -12 | 4 | ✓ Closing observed |
| 09-03 23:22 | 40m | - / -10 | IZ8EYN | 0 / - | 2 | Partial capture |
| 09-03 22:51 | 40m | -7 / - | D2ACE | - / -7 | 5 | ✓ Closing fragment |
| 08-11 01:30 | 40m | - / - | 9A4ZM | -9 / - | 2 | Partial capture |
| 08-11 00:42 | 80m | - / - | MI7XHT | -18 / - | 2 | Partial capture |
| 08-11 00:38 | 80m | - / -25 | SP6JIU | +18 / - | 3 | ✓ Closing fragment |
| 07-28 20:54 | 20m | - / - | M0IIO | -7 / - | 3 | Partial capture |
| 07-16 00:47 | 40m | - / - | F5RRS | -21 / - | 2 | Partial capture |
| 07-16 00:46 | 40m | - / - | 9A4ZM | -17 / - | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 225100 -7 2567 D2ACE W4ZTH EL89 (x5) 232230 +2 735 W4ZTH IZ8EYN -10 (x2) 234145 -8 2108 Z31B W4ZTH EL89 (x2) 234230 -14 2153 W4ZTH Z31B RR73 234245 -10 2108 Z31B W4ZTH 73 234300 -15 2107 W4ZTH EB3JT JN01 (x2) 235245 -6 801 EK/RX3DPK W4ZTH EL89 (x2)
UTC dB Audio Message 003800 +17 2652 W4ZTH SP6JIU -25 (x3) 003930 +4 2593 W4ZTH SP1MGM JO73 003930 -15 2365 W4ZTH MI7XHT IO64 (x3) 010830 +0 2412 W4ZTH SP1MGM JO73 011200 -24 1702 W4ZTH MI7XHT IO64
UTC dB Audio Message 205400 -7 3096 W4ZTH M0IIO IO91 (x3)
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