W4MRK — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving W4MRK, decoded by SO8OO in southeastern Poland. 25 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-08-13 and 2026-08-28.
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 25 FT8 messages attributed to W4MRK as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (88%), followed by 80 m (8%) and 40 m (4%). Most decodes (100%) fell within the six-hour window 00:00-06:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.
Overview
Bands
Last attributed message: 2026-08-28 05:24 UTC
Observed FT8 message patterns
- Attributed sample
- 25 messages
- Active dates
- 6 UTC dates
- Estimated median S/N
- -13 dB
- Estimated 10th-90th percentile
- -22 to -4 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 10, moderate (-15 to -9 dB) 11, strong (≥ -8 dB) 4.
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 W4MRK 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 W4MRK
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
- FM18 · 8 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 7,390 km (approx.)
- Last such locator decoded
- 2026-08-28 04:41 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 | W4MRK S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-29 04:55 | 40m | - / - | PE1NMM | -17 / - | 3 | Partial capture |
| 08-29 04:53 | 40m | - / -5 | ON1JP | -15 / - | 4 | Partial capture |
| 08-29 04:52 | 40m | - / - | IK6DLK | -8 / - | 2 | ✓ Closing fragment |
| 08-29 04:45 | 40m | - / -13 | F5MOO | 0 / - | 3 | ✓ Closing fragment |
| 08-29 04:42 | 40m | - / -12 | DL3MIB | +10 / - | 6 | ✓ Closing fragment |
| 08-29 04:42 | 40m | - / -19 | EA3IZF | -15 / - | 2 | ✓ Closing fragment |
| 08-29 04:37 | 40m | - / -14 | DL3OCF | -6 / - | 2 | ✓ Closing fragment |
| 08-29 04:31 | 40m | - / -16 | YO9IAB | +12 / - | 2 | ✓ Closing fragment |
| 08-28 04:41 | 20m | -4 / +3 | 4L7T | -12 / -21 | 7 | ✓ Full exchange observed |
| 08-28 04:39 | 20m | -16 / - | 9A5E | - / -4 | 2 | Partial capture |
| 08-27 02:33 | 40m | - / -15 | EI2IXB | -10 / - | 2 | ✓ Closing fragment |
| 08-26 01:37 | 20m | -7 / - | KT4ZG | - / - | 2 | Partial capture |
| 08-26 01:14 | 20m | -10 / - | UT7UJ | - / -18 | 2 | Partial capture |
| 08-26 01:11 | 20m | -11 / - | 9A2TN | - / -15 | 4 | ✓ Closing fragment |
| 08-24 05:37 | 20m | - / -15 | IC8TEM | +5 / - | 3 | ✓ Closing fragment |
| 08-24 05:36 | 20m | - / +2 | HC2GRC | -12 / - | 2 | ✓ Closing fragment |
| 08-24 05:33 | 20m | - / -15 | LZ3BS | +8 / - | 2 | ✓ Closing fragment |
| 08-23 00:47 | 20m | -20 / - | K7LNY | - / -12 | 2 | Partial capture |
| 08-22 01:21 | 20m | - / - | 7Z1DM | -3 / - | 4 | ✓ Closing fragment |
| 08-20 04:12 | 20m | - / -13 | TJ1GD | 0 / - | 2 | ✓ Closing fragment |
| 08-20 04:04 | 20m | - / -24 | UN6LN | -19 / - | 2 | ✓ Closing fragment |
| 08-20 03:54 | 40m | - / +2 | HB9CXZ | -14 / - | 2 | ✓ Closing fragment |
| 08-20 03:48 | 80m | - / - | DK5WL | -18 / - | 3 | Partial capture |
| 08-20 03:48 | 80m | - / -7 | DK7ZT | -10 / - | 5 | Partial capture |
| 08-20 02:41 | 80m | - / - | DC6KW | -16 / - | 4 | Partial capture |
| 08-20 00:41 | 40m | - / -18 | EB3JT | -13 / - | 3 | ✓ Closing fragment |
| 08-20 00:35 | 40m | - / -16 | MM0KQC | -17 / - | 7 | Partial capture |
| 08-20 00:02 | 40m | - / -6 | OS4K | -19 / - | 3 | Partial capture |
| 08-19 23:52 | 40m | - / -12 | DK7ZT | -15 / - | 3 | Partial capture |
| 08-19 23:49 | 40m | - / - | IU5HIU | -8 / - | 2 | Partial capture |
| 08-18 03:07 | 80m | - / - | DL4ME | +9 / - | 3 | Partial capture |
| 08-18 03:07 | 80m | - / -17 | GB8VJ | -22 / - | 2 | Partial capture |
| 08-18 03:07 | 80m | - / - | OM0RX | -6 / - | 4 | Partial capture |
| 08-15 02:14 | 20m | - / - | IZ3EAW | -8 / - | 3 | Partial capture |
| 08-14 02:45 | 80m | - / - | W3DQS | -16 / - | 2 | ✓ Closing fragment |
| 08-14 02:21 | 80m | - / -21 | DK7ZT | +2 / - | 5 | Partial capture |
| 08-14 01:32 | 80m | - / -17 | DK7ZT | +4 / - | 2 | Partial capture |
| 08-13 03:47 | 80m | - / - | DO1ID | +19 / - | 2 | Partial capture |
| 08-13 03:46 | 80m | - / - | DO8JB | -6 / - | 11 | Partial capture |
| 08-13 03:40 | 80m | - / - | 9A4ZM | +12 / - | 3 | Partial capture |
| 08-13 03:37 | 80m | - / -4 | PI4DX | 0 / - | 2 | ✓ Closing fragment |
| 08-07 03:54 | 20m | - / - | UR4QFP | 0 / - | 2 | Partial capture |
| 08-07 03:48 | 20m | - / -12 | 4X1UF | -12 / - | 2 | ✓ Closing fragment |
| 08-06 02:54 | 20m | - / - | HB9TIH | -18 / - | 2 | Partial capture |
| 07-25 05:27 | 20m | - / -15 | 4Z1RZ | -6 / - | 2 | Partial capture |
| 07-25 05:26 | 20m | - / - | OD5KU | -3 / - | 3 | Partial capture |
| 07-25 04:33 | 20m | - / -13 | T77BL | -4 / - | 2 | ✓ Closing fragment |
| 07-25 04:29 | 20m | - / -1 | LX1TI | +1 / - | 2 | ✓ Closing fragment |
| 07-25 04:26 | 20m | - / -14 | UR9QQ | -12 / - | 6 | ✓ Closing fragment |
| 07-25 04:14 | 20m | - / -14 | R2GF | -4 / - | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 030845 -5 1504 W4MRK OM0RX JN88 024100 -19 1834 W4MRK DC6KW JO30 (x4) 034800 -7 1894 W4MRK DK7ZT -07 034800 -16 1515 W4MRK DK5WL JN39 034830 -11 1894 W4MRK DK7ZT -07 034830 -20 1516 W4MRK DK5WL JN39 034900 -13 1893 W4MRK DK7ZT -07 034900 -19 1515 W4MRK DK5WL JN39 034930 -11 1893 W4MRK DK7ZT -07 (x2) 024315 +8 1914 W4MRK DK5WL JN39 024445 -9 1316 W4MRK GM6URC -17
UTC dB Audio Message 044445 +10 1009 W4MRK DL3MIB 73 044515 -1 1977 W4MRK F5MOO JN07 (x3) 044645 -13 310 W4MRK EA2XX R-17 044745 +0 890 W4MRK DD7EE JO41 045215 -11 2148 W4MRK IK6DLK JN63 045315 -14 1059 W4MRK ON1JP -05 045315 -4 2148 W4MRK IK6DLK 73 045345 -13 1059 W4MRK ON1JP -05 (x3) 045530 -9 1646 W4MRK PE1NMM JO32 (x3)
UTC dB Audio Message 013700 -10 365 KT4ZG W4MRK FM18 (x2) 013830 -21 1143 WS7M W4MRK R-12 043945 -15 2209 9A5E W4MRK FM18 (x2) 044100 -16 310 W4MRK 4L7T +03 044115 -3 312 4L7T W4MRK FM18 044130 -10 310 W4MRK 4L7T -04 (x2) 044215 -6 312 4L7T W4MRK R-21 044230 -11 311 W4MRK 4L7T RR73 044245 -4 311 4L7T W4MRK 73 050200 -17 2017 W4MRK YL2KF -18 050400 -3 2018 W4MRK R7BN LN05 052430 -14 2667 ES6DO W4MRK 73
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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