DD4U — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving DD4U, decoded by SO8OO in southeastern Poland. 3,982 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, across 7 UTC dates in the available aggregate history. Observed between 2026-09-26 and 2026-10-02.
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 3,982 FT8 messages attributed to DD4U as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (63%), followed by 60 m (27%) and 40 m (7%). Most decodes (50%) fell within the six-hour window 21:00-03:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (61%); the estimated median was -6 dB.
Overview
Bands
Last attributed message: 2026-10-02 23:03 UTC
Observed FT8 message patterns
- Attributed sample
- 3,982 messages
- Active dates
- 7 UTC dates
- Estimated median S/N
- -6 dB
- Estimated 10th-90th percentile
- -16 to +1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 415, moderate (-15 to -9 dB) 1,126, strong (≥ -8 dB) 2,441.
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 · 2,802 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,006 km (approx.)
- Last such locator decoded
- 2026-10-02 23:03 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 |
|---|---|---|---|---|---|---|
| 10-02 23:09 | 40m | - / -5 | EB3WH | -21 / - | 2 | ✓ Closing fragment |
| 10-02 23:06 | 40m | - / -17 | W2CG | -15 / - | 3 | ✓ Closing fragment |
| 10-02 23:00 | 60m | -14 / - | EI3HA | - / -13 | 3 | Partial capture |
| 10-02 22:53 | 60m | -11 / - | SP7CMW | - / +3 | 2 | ✓ Closing fragment |
| 10-02 22:51 | 60m | -14 / -1 | IZ3XBL | +4 / -4 | 5 | ✓ Full exchange observed |
| 10-02 22:50 | 60m | -10 / -21 | PC1Y | -22 / -18 | 5 | ✓ Full exchange observed |
| 10-02 22:48 | 60m | -14 / -15 | DD1UN | +13 / -16 | 5 | ✓ Full exchange observed |
| 10-02 22:46 | 60m | -16 / - | F6HYF | - / -12 | 2 | ✓ Closing fragment |
| 10-02 22:40 | 60m | -7 / - | OE5GQQ | - / -10 | 3 | ✓ Closing fragment |
| 10-02 22:35 | 60m | -12 / -13 | ER1CW | -19 / -4 | 5 | ✓ Full exchange observed |
| 10-02 22:33 | 60m | -21 / - | N8OQ | - / -17 | 2 | ✓ Closing fragment |
| 10-02 22:29 | 60m | -18 / -16 | DL8DAQ | 0 / -10 | 7 | ✓ Full exchange observed |
| 10-02 22:26 | 60m | -12 / - | SP5ES | -13 / - | 3 | ✓ Closing observed |
| 10-02 22:22 | 60m | -14 / - | AC2PB | - / -4 | 2 | ✓ Closing fragment |
| 10-02 22:10 | 160m | - / - | DL1HDL | -6 / - | 2 | Partial capture |
| 10-02 22:03 | 160m | -19 / -3 | DJ3ZF | +2 / +3 | 4 | ✓ Full exchange observed |
| 10-02 22:02 | 160m | - / - | SN6P | 0 / - | 3 | Partial capture |
| 10-02 21:46 | 60m | -10 / -7 | SV1DZB | -8 / -4 | 4 | ✓ Full exchange observed |
| 10-02 21:41 | 60m | -5 / - | OZ1BZJ | -8 / -15 | 9 | Partial capture |
| 10-02 21:39 | 60m | -10 / +2 | DK8BZ | +2 / -11 | 5 | ✓ Full exchange observed |
| 10-02 21:32 | 60m | -5 / -7 | OH3GBW | -4 / -11 | 5 | ✓ Full exchange observed |
| 10-02 21:25 | 60m | -13 / - | TA4SSK | - / -15 | 4 | ✓ Closing fragment |
| 10-02 21:17 | 60m | -8 / - | TA4SSK | - / -19 | 3 | Partial capture |
| 10-02 21:03 | 60m | -10 / -10 | DL1DBR | -20 / -20 | 7 | ✓ Full exchange observed |
| 10-02 21:00 | 60m | -12 / -15 | 9K2HS | -5 / -8 | 4 | ✓ Full exchange observed |
| 10-02 20:53 | 60m | -9 / -2 | F5MXH | -10 / +5 | 5 | ✓ Full exchange observed |
| 10-02 20:52 | 60m | -5 / - | DL8SBE | -24 / -7 | 2 | ✓ Closing observed |
| 10-02 20:47 | 60m | -8 / -13 | DK2CC | -9 / - | 6 | ✓ Closing observed |
| 10-02 20:47 | 60m | -15 / - | IU2VUZ | -24 / - | 2 | ✓ Closing observed |
| 10-02 20:47 | 60m | -10 / -5 | IU3ACL | -5 / +7 | 4 | ✓ Full exchange observed |
| 10-02 20:45 | 60m | -4 / -2 | F4HDR | -5 / +8 | 5 | ✓ Full exchange observed |
| 10-02 20:43 | 60m | -4 / +4 | M0LOW | -5 / -2 | 5 | ✓ Full exchange observed |
| 10-02 20:40 | 60m | -10 / - | OE7BJT | -18 / -4 | 3 | ✓ Closing observed |
| 10-02 20:40 | 60m | -6 / - | G0ACQ | - / - | 2 | ✓ Closing fragment |
| 10-02 20:37 | 60m | -8 / - | IU5JAE | - / -21 | 2 | ✓ Closing fragment |
| 10-02 20:33 | 60m | -9 / -3 | DC7DX | -14 / -9 | 5 | ✓ Full exchange observed |
| 10-02 20:26 | 60m | -11 / +4 | DJ1AE | -11 / -16 | 5 | ✓ Full exchange observed |
| 10-02 20:24 | 60m | -14 / - | M0MNV | - / -7 | 2 | ✓ Closing fragment |
| 10-02 20:21 | 60m | -7 / +10 | DK1CE | +15 / +9 | 5 | ✓ Full exchange observed |
| 10-02 20:17 | 60m | -10 / -13 | ON7VZ | -6 / +6 | 4 | ✓ Full exchange observed |
| 10-02 20:16 | 60m | -8 / -2 | IW2FUT | -17 / +5 | 5 | ✓ Full exchange observed |
| 10-02 20:12 | 60m | -6 / -6 | PE1MHY | -6 / - | 3 | ✓ Full exchange observed |
| 10-02 20:03 | 60m | -7 / -19 | OZ0A | 0 / -11 | 6 | ✓ Full exchange observed |
| 10-02 20:01 | 60m | -2 / +3 | IV3DSG | +5 / +6 | 4 | ✓ Full exchange observed |
| 10-02 19:59 | 60m | -2 / - | EA4CPM | - / -13 | 2 | ✓ Closing fragment |
| 10-02 19:56 | 60m | -2 / -13 | DC6KI | -11 / - | 4 | ✓ Full exchange observed |
| 10-02 19:55 | 60m | +4 / -4 | OH3MB | +3 / - | 4 | ✓ Closing observed |
| 10-02 19:53 | 60m | +3 / - | OE9RWH | - / -6 | 3 | ✓ Closing fragment |
| 10-02 19:51 | 60m | -2 / -1 | F5RRS | -1 / +5 | 5 | ✓ Full exchange observed |
| 10-02 19:47 | 60m | -3 / - | SP3JHZ | - / -5 | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 170330 -6 599 CQ DD4U JO44 (x3) 171115 -11 2241 DD4U DL6UXL JO72 171400 -5 599 CQ DD4U JO44 171645 -5 2220 DD4U IK8UHA JN70 171700 -10 600 IK8UHA DD4U +04 171715 -2 2220 DD4U IK8UHA R-10 171730 -8 599 IK8UHA DD4U RR73 171815 +1 2197 DD4U IK8UHA 73 230645 -14 1932 DD4U W2CG FN20 (x3) 230915 -19 1270 DD4U EB3WH -05 (x2)
UTC dB Audio Message 225500 -13 1382 CQ DD4U JO44 (x10) 230000 -14 1382 EI3HA DD4U R-13 (x3) 230130 -14 1382 CQ DD4U JO44 (x2)
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)
UTC dB Audio Message 060815 -7 1115 DD4U G4GVB JO02 060830 -14 1115 G4GVB DD4U +04 060845 -10 1115 DD4U G4GVB R+02 060900 -13 1115 G4GVB DD4U RR73 060915 -7 1115 DD4U G4GVB 73 060930 -12 1114 CQ DD4U JO44 061000 -15 1115 DO1KPH DD4U +05 (x2) 061100 -11 1114 CQ DD4U JO44 a1 (x4) 061500 -14 1115 DO9MDI DD4U RR73 061530 -16 1115 CQ DD4U JO44 (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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