DD4U — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving DD4U, decoded by SO8OO in southeastern Poland. 5,233 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, across 9 UTC dates in the available aggregate history. Observed between 2026-09-26 and 2026-10-04.
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 5,233 FT8 messages attributed to DD4U as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (67%), followed by 60 m (24%) and 40 m (7%). Most decodes (53%) fell within the six-hour window 23:00-05:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (65%); the estimated median was -5 dB.
Overview
Bands
Last attributed message: 2026-10-04 05:08 UTC
Observed FT8 message patterns
- Attributed sample
- 5,233 messages
- Active dates
- 9 UTC dates
- Estimated median S/N
- -5 dB
- Estimated 10th-90th percentile
- -16 to +2.8 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 549, moderate (-15 to -9 dB) 1,260, strong (≥ -8 dB) 3,424.
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 DD4U 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 DD4U
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
- JO44 · 3,838 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,006 km (approx.)
- Last such locator decoded
- 2026-10-04 05:08 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 | DD4U S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-04 04:58 | 80m | -2 / +3 | DL4HTK | -2 / +4 | 5 | ✓ Full exchange observed |
| 10-04 04:03 | 80m | -1 / +2 | DG5MLA | +12 / - | 4 | ✓ Closing observed |
| 10-04 04:02 | 80m | -4 / -8 | DL3RL | +15 / - | 7 | ✓ Full exchange observed |
| 10-04 03:46 | 80m | -7 / -1 | R1TAX | +4 / +3 | 4 | ✓ Full exchange observed |
| 10-04 03:44 | 80m | -3 / - | R2AL | - / +8 | 2 | ✓ Closing fragment |
| 10-04 03:25 | 60m | - / -9 | IZ7DJS | -12 / - | 4 | ✓ Closing fragment |
| 10-04 03:25 | 60m | -7 / - | S56P | -3 / - | 3 | Partial capture |
| 10-04 03:22 | 60m | -8 / - | N9TF | - / -13 | 2 | ✓ Closing fragment |
| 10-04 03:20 | 60m | -10 / -25 | DL1LCK | -4 / -18 | 5 | ✓ Full exchange observed |
| 10-04 03:18 | 60m | -9 / - | KC9OXP | - / -21 | 2 | Partial capture |
| 10-04 03:15 | 60m | -9 / - | W3FAY | - / -17 | 2 | ✓ Closing fragment |
| 10-04 03:08 | 80m | -2 / -2 | DL4RBR | 0 / +10 | 6 | ✓ Full exchange observed |
| 10-04 02:55 | 80m | -8 / - | S55X | -8 / +2 | 6 | Partial capture |
| 10-04 02:29 | 80m | - / - | SV8NAJ | -15 / - | 2 | ✓ Closing fragment |
| 10-04 02:28 | 80m | 0 / - | DO7UFN | - / -4 | 2 | ✓ Closing fragment |
| 10-04 02:19 | 80m | +6 / - | DL1NDN | -19 / -10 | 3 | ✓ Closing observed |
| 10-04 02:13 | 80m | -1 / -10 | RD7O | -4 / - | 3 | ✓ Closing observed |
| 10-04 02:07 | 80m | -5 / 0 | DH0KAI | +11 / - | 3 | Partial capture |
| 10-04 02:03 | 80m | -2 / - | DJ3QK | - / +2 | 2 | ✓ Closing fragment |
| 10-04 01:47 | 80m | -4 / - | DO7KGB | - / -7 | 3 | ✓ Closing fragment |
| 10-04 01:41 | 80m | -2 / -1 | PA1CTW | +3 / 0 | 3 | ✓ Full exchange observed |
| 10-04 01:34 | 80m | 0 / - | UA3PAB | - / -6 | 2 | ✓ Closing fragment |
| 10-04 01:20 | 80m | -6 / - | M0PFX | - / -18 | 3 | ✓ Closing fragment |
| 10-04 01:11 | 80m | -4 / - | N4II | - / -2 | 2 | ✓ Closing fragment |
| 10-04 00:42 | 80m | - / -8 | HB9HRG | -11 / - | 3 | ✓ Closing fragment |
| 10-04 00:37 | 80m | - / -20 | R4FDD | -7 / - | 2 | ✓ Closing fragment |
| 10-04 00:25 | 80m | +4 / - | EA7GUK | - / -10 | 2 | ✓ Closing fragment |
| 10-04 00:12 | 80m | +6 / - | DL5CTE | -17 / -14 | 2 | Partial capture |
| 10-03 23:58 | 80m | +6 / - | SQ2E | -7 / -7 | 3 | Partial capture |
| 10-03 23:37 | 80m | +4 / -11 | UR5TOB | -3 / - | 5 | ✓ Closing observed |
| 10-03 23:33 | 80m | - / -18 | RC6OU | +3 / - | 2 | ✓ Closing fragment |
| 10-03 23:27 | 80m | - / -7 | DH3MFW | +8 / - | 4 | ✓ Closing fragment |
| 10-03 23:24 | 80m | - / -9 | SP1AKA | 0 / - | 3 | ✓ Closing fragment |
| 10-03 23:20 | 80m | - / -19 | KM3V | -7 / - | 3 | ✓ Closing fragment |
| 10-03 23:13 | 80m | - / -1 | M0MLS | -7 / - | 3 | ✓ Closing fragment |
| 10-03 22:56 | 80m | +3 / +6 | DO9MH | 0 / 0 | 5 | ✓ Full exchange observed |
| 10-03 22:49 | 80m | -2 / -15 | PA1AA | -11 / -2 | 5 | ✓ Full exchange observed |
| 10-03 22:47 | 80m | - / -11 | OK1WCF | +13 / - | 3 | ✓ Closing fragment |
| 10-03 22:35 | 80m | +6 / - | DB4VI | -2 / - | 2 | Partial capture |
| 10-03 22:12 | 80m | - / -3 | SP2TQQ | -7 / - | 3 | ✓ Closing fragment |
| 10-03 21:59 | 80m | - / -13 | OK1SI | +12 / - | 3 | ✓ Closing fragment |
| 10-03 21:52 | 80m | +1 / - | RK3YWS/P | +6 / +1 | 3 | Partial capture |
| 10-03 21:49 | 80m | -2 / -6 | SP9HPI | +7 / -1 | 5 | ✓ Full exchange observed |
| 10-03 21:46 | 80m | -6 / - | BA5AN | - / -13 | 6 | ✓ Closing fragment |
| 10-03 21:42 | 80m | -8 / - | DH4PAP | +3 / - | 4 | ✓ Closing observed |
| 10-03 21:38 | 80m | -2 / -18 | YO3YV | +4 / +2 | 9 | ✓ Full exchange observed |
| 10-03 21:37 | 80m | -5 / +6 | ON4MAP | -2 / +5 | 4 | ✓ Full exchange observed |
| 10-03 21:31 | 80m | -7 / - | DD0D | - / -1 | 4 | ✓ Closing fragment |
| 10-03 21:27 | 80m | -6 / - | DK5AN | - / 0 | 2 | ✓ Closing fragment |
| 10-03 21:26 | 80m | -3 / -16 | SP5ES | +7 / +6 | 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 045800 -7 1996 CQ DD4U JO44 (x2) 045845 +0 1995 DD4U DL4HTK JO51 045900 +0 1996 DL4HTK DD4U +04 045915 -1 1995 DD4U DL4HTK R+03 045930 -5 1996 DL4HTK DD4U RR73 045945 -6 1996 DD4U DL4HTK 73 050000 -10 1996 CQ DD4U JO44 (x3) 050145 -17 2734 DD4U OH7VV KP32 050630 -12 1996 CQ DD4U JO44 (x4)
UTC dB Audio Message 032530 -7 2107 CQ DD4U JO44 032545 -2 1636 DD4U S56P JN76 032545 -15 2012 DD4U IZ7DJS JN81 032600 -7 2107 S56P DD4U +16 032615 -4 1636 DD4U S56P R+18 032615 -17 2013 DD4U IZ7DJS JN81 (x3) 032730 -5 2107 DL6FKR DD4U RR73 032900 -7 2018 CQ DD4U JO44 (x6)
UTC dB Audio Message 144700 -17 1856 CQ DD4U JO44 144730 -22 1855 DL2USR DD4U -01 144745 -12 1855 DD4U DL2USR R-01 144745 -20 1340 DD4U DB5OET JO41 (x2) 144830 -20 1856 DB5OET DD4U RR73 144900 -20 1856 CQ DD4U JO44 144945 -7 1152 DD4U DL2VN JO51 (x2) 145030 -16 1856 DL2VN DD4U RR73 145045 +0 1151 DD4U DL2VN 73 145215 -14 784 DD4U PD5MSC JO22 (x3) 044700 -14 2639 CQ DD4U JO44
UTC dB Audio Message 220245 +0 2127 DD4U SN6P JO80 220300 -20 1779 DJ3ZF DD4U +03 220315 +1 2127 DD4U SN6P JO80 220315 +3 1971 DD4U DJ3ZF R-03 220330 -18 1779 DJ3ZF DD4U RR73 220345 +2 1971 DD4U DJ3ZF 73 220400 -22 1779 CQ DD4U JO44 (x7) 221045 -7 1001 DD4U DL1HDL JO53 (x2)
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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