W4U — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving W4U, decoded by SO8OO in southeastern Poland. 5 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-07-31.
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 5 FT8 messages attributed to W4U 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 -16 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 5 messages
- Active dates
- 1 UTC dates
- Estimated median S/N
- -16 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 4, moderate (-15 to -9 dB) 1, strong (≥ -8 dB) 0.
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 W4U in decoded directed-looking exchanges:
Most frequent locator attributed to W4U
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
- FN20 · 3 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 7,111 km (approx.)
- Last such locator decoded
- 2026-07-31 21:25 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 | W4U S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-01 23:08 | 20m | - / -15 | NP4TX | -21 / - | 3 | Partial capture |
| 08-01 22:33 | 20m | - / +3 | F8FUA | +6 / - | 2 | ✓ Closing fragment |
| 08-01 22:28 | 20m | - / - | TA3JOH | -14 / - | 3 | Partial capture |
| 08-01 10:06 | 20m | - / - | IK4LZH | -2 / - | 4 | Partial capture |
| 08-01 10:05 | 20m | - / - | UC6Y | -18 / - | 5 | Partial capture |
| 08-01 09:59 | 20m | - / - | IK4LZH | 0 / - | 2 | Partial capture |
| 08-01 09:59 | 20m | - / - | PD4RFS | -22 / - | 14 | Partial capture |
| 08-01 09:59 | 20m | - / -17 | RU6FS | 0 / - | 4 | Partial capture |
| 08-01 09:59 | 20m | - / -14 | SM5UNR | -16 / - | 2 | Partial capture |
| 08-01 09:55 | 20m | - / -22 | PD4FL | -18 / - | 6 | ✓ Closing fragment |
| 08-01 09:48 | 20m | - / - | SV1EKI | -7 / - | 3 | Partial capture |
| 08-01 09:42 | 20m | - / - | IZ0GIY | 0 / - | 4 | Partial capture |
| 08-01 09:40 | 20m | - / -9 | RA3TPJ | -19 / - | 3 | ✓ Closing fragment |
| 08-01 09:40 | 20m | - / -6 | UA6FZ | +1 / - | 4 | ✓ Closing fragment |
| 08-01 09:35 | 20m | - / - | R4HJN | -13 / - | 4 | Partial capture |
| 08-01 09:35 | 20m | - / -8 | R6FMK | -18 / - | 2 | ✓ Closing fragment |
| 08-01 09:34 | 20m | - / - | SV1EKI | -8 / - | 4 | Partial capture |
| 08-01 09:33 | 20m | - / - | RZ4FWA | -13 / - | 2 | Partial capture |
| 08-01 09:17 | 20m | - / - | OZ9GA | -15 / - | 2 | Partial capture |
| 08-01 09:14 | 20m | - / -11 | R2RAU | -6 / - | 2 | ✓ Closing fragment |
| 08-01 09:11 | 20m | - / -8 | RA3ZDU | -20 / - | 5 | ✓ Closing fragment |
| 08-01 09:09 | 20m | - / - | R4HJN | -16 / - | 5 | Partial capture |
| 08-01 09:07 | 20m | - / - | SV1EKI | -4 / - | 4 | Partial capture |
| 08-01 07:51 | 20m | - / - | R4HJN | -8 / - | 2 | Partial capture |
| 08-01 07:48 | 20m | - / -10 | DL9TZ | -10 / - | 2 | Partial capture |
| 08-01 07:47 | 20m | - / - | SV1EKI | -2 / - | 4 | Partial capture |
| 08-01 07:47 | 20m | - / - | PD0SF | -14 / - | 4 | Partial capture |
| 08-01 07:47 | 20m | - / - | RU4SS | -16 / - | 2 | Partial capture |
| 08-01 07:46 | 20m | - / - | RW6MAO | -13 / - | 3 | Partial capture |
| 08-01 07:46 | 20m | - / -8 | OZ9FF | -19 / - | 4 | Partial capture |
| 08-01 07:42 | 20m | - / - | IK4LZH | +4 / - | 3 | Partial capture |
| 08-01 07:42 | 20m | - / - | RU4SS | -24 / - | 2 | Partial capture |
| 08-01 07:42 | 20m | - / - | RW6MAO | -8 / - | 3 | Partial capture |
| 08-01 07:42 | 20m | - / - | SA3SHN | -14 / - | 4 | Partial capture |
| 08-01 07:42 | 20m | - / - | SV1EKI | -9 / - | 3 | Partial capture |
| 08-01 07:40 | 20m | - / -19 | ON1JP | -22 / - | 3 | Partial capture |
| 08-01 07:35 | 20m | - / - | YO5PHL | -18 / - | 2 | Partial capture |
| 08-01 07:12 | 20m | - / -22 | F4FSY | -9 / - | 2 | Partial capture |
| 08-01 07:12 | 20m | - / - | RZ4FWA | -12 / - | 2 | Partial capture |
| 08-01 07:12 | 20m | - / +2 | UT7UJ | -2 / - | 6 | Partial capture |
| 08-01 03:33 | 80m | - / -12 | VO1IV | -18 / - | 2 | ✓ Closing fragment |
| 07-31 21:18 | 20m | - / -5 | F4HTA | +6 / - | 2 | ✓ Closing fragment |
| 07-31 21:14 | 20m | - / 0 | G0OSK | 0 / - | 4 | Partial capture |
| 07-31 20:59 | 20m | -18 / -11 | A71UN | -8 / - | 3 | ✓ Closing observed |
| 07-31 20:56 | 20m | - / - | EA3GXK | -9 / - | 2 | Partial capture |
| 07-31 20:47 | 20m | - / - | ON3KJU | -5 / - | 6 | Partial capture |
| 07-31 20:43 | 20m | - / -13 | TA4SM | -10 / - | 3 | Partial capture |
| 07-31 20:40 | 20m | - / - | RZ4FWA | -14 / - | 4 | Partial capture |
| 07-31 20:37 | 20m | - / -12 | RG2T | -6 / - | 3 | ✓ Closing fragment |
| 07-31 20:36 | 20m | - / -18 | R3UAX | -4 / - | 8 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 100745 -18 1967 W4U UC6Y LN04 100745 -24 1858 W4U PD4RFS JO21 100745 +5 461 W4U IK4LZH JN54 100815 -23 1858 W4U PD4RFS JO21 (x2) 222315 -13 1102 W4U M6GPH IO83 222845 -16 1809 W4U TA3JOH LM17 (x3) 223345 +8 765 W4U F8FUA +03 (x2) 230815 -20 1635 W4U NP4TX -15 (x3) 232445 -12 1219 W4U R9SBQ -16
UTC dB Audio Message 010945 -14 281 W4U W2VGD FN20 (x2) 011245 -8 2606 W4U AA6KJ RR73 011345 -20 1235 W4U K2FST -22 012045 -22 1466 W4U KA1ERL 73 013045 -12 703 W4U N4MC -06 (x2) 014530 -24 453 W4U W4IEE R-23 020300 -24 1506 W4U AC8RJ +06 021530 -24 453 W4U W4IEE -12 (x2) 022700 -24 1582 W4U W3XG FM19 033315 -17 1883 W4U VO1IV -12 (x2)
UTC dB Audio Message 031645 -1 438 W4U IK4LZH JN54 (x3) 031815 -10 546 W4U IW2DNI JN45 032200 -11 766 W4U DM2AB JN49 (x2) 032730 +2 840 W4U DK8HM JN39 032800 -17 1948 W4U IW0HAC JN61 (x3) 033030 -19 2326 W4U YO9IAB KN25 (x3) 033200 -12 2248 W4U IZ8DBJ JN70 033630 -3 2285 W4U DL8TV -22
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