4X5EF — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving 4X5EF, decoded by SO8OO in southeastern Poland. 829 FT8 messages attributed to this token as transmitter, on 60m, 20m, across 38 UTC dates in the available aggregate history. Observed between 2026-07-25 and 2026-10-03.
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 829 FT8 messages attributed to 4X5EF as the transmitting token by decoded message structure across 38 UTC dates in the available aggregate history. The largest monitored-band total was 60 m (82%), followed by 20 m (18%). Most decodes (94%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -15 dB.
Overview
Bands
Last attributed message: 2026-10-03 22:02 UTC
Observed FT8 message patterns
- Attributed sample
- 829 messages
- Active dates
- 38 UTC dates
- Estimated median S/N
- -15 dB
- Estimated 10th-90th percentile
- -20 to -8 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 342, moderate (-15 to -9 dB) 401, strong (≥ -8 dB) 86.
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 4X5EF 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 4X5EF
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
- KM72 · 529 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 2,224 km (approx.)
- Last such locator decoded
- 2026-10-03 21:52 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 | 4X5EF S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-03 21:54 | 60m | - / - | F1AFB | -15 / - | 2 | Partial capture |
| 10-03 21:53 | 60m | -12 / -7 | DK1ML | +7 / -11 | 14 | Partial capture |
| 10-03 21:41 | 60m | -15 / -12 | PE1MHY | -2 / -20 | 6 | ✓ Full exchange observed |
| 10-03 21:13 | 60m | - / - | IU1VJP | -18 / - | 2 | Partial capture |
| 10-03 21:11 | 60m | - / -12 | PE1MHY | -2 / - | 4 | Partial capture |
| 10-03 21:09 | 60m | - / - | DC7KM | +2 / - | 2 | Partial capture |
| 10-03 21:06 | 60m | - / - | DC7KM | +2 / - | 2 | Partial capture |
| 10-03 21:05 | 60m | - / - | SM1NJC | -18 / - | 2 | Partial capture |
| 10-03 21:05 | 60m | - / -12 | PE1MHY | -8 / - | 2 | Partial capture |
| 10-03 18:37 | 60m | -14 / -21 | SP2DW | +4 / -16 | 6 | ✓ Full exchange observed |
| 10-03 17:54 | 60m | - / - | OE4MTI | -12 / - | 4 | Partial capture |
| 10-03 17:48 | 60m | -11 / -9 | F4LJG | -10 / -16 | 7 | ✓ Full exchange observed |
| 10-03 17:48 | 60m | - / - | SP3EIE | -6 / - | 2 | Partial capture |
| 10-03 17:47 | 60m | - / - | OE4MTI | -9 / - | 4 | Partial capture |
| 10-03 17:16 | 60m | - / - | IZ8XJJ | -7 / - | 4 | Partial capture |
| 10-03 17:13 | 60m | - / - | I0VHL | -3 / - | 2 | Partial capture |
| 10-03 17:13 | 60m | - / - | IU1VJP | -15 / - | 5 | Partial capture |
| 10-03 17:12 | 60m | -12 / -10 | DK9NP | +6 / -17 | 20 | ✓ Full exchange observed |
| 10-02 20:28 | 60m | -6 / - | YO4BEW | -24 / -11 | 3 | ✓ Closing observed |
| 10-02 20:27 | 60m | - / - | DL4EJ | -22 / - | 2 | Partial capture |
| 10-02 20:24 | 60m | - / - | DJ1NE | -7 / - | 2 | Partial capture |
| 10-02 20:23 | 60m | - / +7 | PE1MHY | -5 / - | 3 | Partial capture |
| 10-02 19:46 | 60m | -10 / -16 | DJ4FAN | -4 / -15 | 6 | ✓ Full exchange observed |
| 10-01 21:00 | 60m | -18 / - | YB9HXO | - / -18 | 2 | ✓ Closing fragment |
| 10-01 20:57 | 60m | - / - | ON4MHZ | -20 / - | 3 | Partial capture |
| 10-01 20:56 | 60m | - / - | PA5KT | -18 / - | 2 | Partial capture |
| 10-01 20:50 | 60m | -14 / - | LA2XNA | - / -19 | 2 | ✓ Closing fragment |
| 10-01 20:49 | 60m | - / - | ON4MHZ | -21 / - | 3 | Partial capture |
| 10-01 20:47 | 60m | - / - | SP3JHZ | -5 / - | 2 | Partial capture |
| 10-01 20:45 | 40m | - / - | PI4TX | -14 / - | 3 | Partial capture |
| 10-01 20:45 | 60m | - / -20 | G4AAV | -10 / - | 2 | Partial capture |
| 10-01 20:31 | 60m | -18 / -15 | G3WGC | +1 / -17 | 11 | ✓ Full exchange observed |
| 10-01 20:31 | 60m | - / - | OV5SP | -20 / - | 6 | Partial capture |
| 10-01 20:31 | 60m | - / - | OZ1LFI | -23 / - | 3 | Partial capture |
| 10-01 20:30 | 60m | - / - | DL6ZXG | +4 / - | 2 | Partial capture |
| 10-01 19:27 | 60m | -18 / -7 | SM6PZI | -13 / -14 | 5 | ✓ Full exchange observed |
| 10-01 19:26 | 60m | - / - | OV5SP | -20 / - | 2 | Partial capture |
| 10-01 19:20 | 60m | -18 / -1 | OE6BHD | 0 / -17 | 6 | ✓ Full exchange observed |
| 10-01 19:20 | 60m | -12 / -8 | HA5CPN | -11 / -21 | 5 | ✓ Full exchange observed |
| 09-29 21:55 | 60m | - / -14 | DL3YEM | +2 / - | 3 | ✓ Closing fragment |
| 09-29 21:51 | 60m | - / +4 | PE1MHY | -4 / - | 3 | Partial capture |
| 09-29 21:48 | 60m | - / - | DL9YBH | -15 / - | 2 | Partial capture |
| 09-29 21:45 | 60m | - / - | DL3YEM | +5 / - | 7 | Partial capture |
| 09-29 21:45 | 60m | - / -6 | EB5AFK | -2 / - | 2 | Partial capture |
| 09-29 21:43 | 60m | - / - | DG5PW | -12 / - | 11 | Partial capture |
| 09-29 21:24 | 60m | - / - | DL3YEM | +4 / - | 5 | Partial capture |
| 09-29 21:23 | 60m | -20 / -16 | DL1OBF | +8 / -9 | 4 | ✓ Full exchange observed |
| 09-28 19:35 | 60m | - / -17 | F5OZC | +2 / - | 3 | Partial capture |
| 09-28 19:35 | 60m | - / - | SM5CBN | -7 / - | 5 | Partial capture |
| 09-28 19:34 | 60m | -23 / -11 | LA8ZIA | -16 / -17 | 7 | ✓ Full exchange observed |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 215315 -13 1013 DK1ML 4X5EF R-11 (x2) 215400 -14 1634 4X5EF F1AFB JN33 (x2) 215445 -14 1014 DK1ML 4X5EF R-11 (x11)
UTC dB Audio Message 180715 -10 589 4X5EF OK1JAZ JO70 190330 -5 2286 4X5EF PI4TX JO22 (x6)
UTC dB Audio Message 210715 -12 1085 TA2CAX 4X5EF -20 193400 -7 1668 4X5EF F4JZW JN08 (x3) 200630 +0 1930 4X5EF G4DBW JO01 (x2) 200800 +3 2198 4X5EF G8CRB JO02 (x2) 201200 -12 2022 4X5EF G3ROY IO70 (x4) 203000 -6 1087 4X5EF ME7IEB IO91 (x3)
UTC dB Audio Message 091430 -17 2097 4X5EF R6DZL LN04 091430 +4 2733 4X5EF F1PBZ -09
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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