DF4FS — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving DF4FS, decoded by SO8OO in southeastern Poland. 1,137 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, across 29 UTC dates in the available aggregate history. Observed between 2026-08-20 and 2026-10-14.
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 1,137 FT8 messages attributed to DF4FS as the transmitting token by decoded message structure across 29 UTC dates in the available aggregate history. The largest monitored-band total was 160 m (32%), followed by 80 m (25%) and 40 m (21%). Most decodes (91%) fell within the six-hour window 18:00-00:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.
Overview
Bands
Last attributed message: 2026-10-14 01:03 UTC
Observed FT8 message patterns
- Attributed sample
- 1,137 messages
- Active dates
- 29 UTC dates
- Estimated median S/N
- -12 dB
- Estimated 10th-90th percentile
- -19.9 to -1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 303, moderate (-15 to -9 dB) 471, strong (≥ -8 dB) 363.
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 DF4FS 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 DF4FS
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
- JN48 · 574 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 941 km (approx.)
- Last such locator decoded
- 2026-10-14 01:03 UTC
Other locator fields attributed to this token: GL73 (1).
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 | DF4FS S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-14 23:20 | 40m | - / -18 | SV3AUW | -6 / - | 3 | ✓ Closing fragment |
| 10-14 00:51 | 80m | -4 / -5 | GM6URC | -8 / 0 | 5 | ✓ Full exchange observed |
| 10-14 00:48 | 80m | -8 / - | RN6HK | +6 / +1 | 4 | Partial capture |
| 10-14 00:47 | 80m | -4 / - | OK1HEH | +4 / +1 | 3 | ✓ Closing observed |
| 10-14 00:43 | 80m | - / -1 | OK1HEH | +10 / - | 3 | Partial capture |
| 10-14 00:42 | 80m | +2 / +3 | RA4P/P | -3 / +2 | 3 | Partial capture |
| 10-13 23:38 | 80m | -7 / - | IZ1HJU | -12 / -11 | 6 | Partial capture |
| 10-13 23:37 | 80m | -8 / - | F6BHK | - / -1 | 4 | ✓ Closing fragment |
| 10-13 23:36 | 80m | - / - | ON7VZ | +4 / - | 3 | Partial capture |
| 10-13 23:34 | 80m | -6 / - | ON4MAP | - / - | 2 | ✓ Closing fragment |
| 10-13 23:34 | 80m | -9 / - | DO1OAS | +5 / +5 | 4 | Partial capture |
| 10-13 23:32 | 80m | - / +4 | DL/AD2LX | +6 / - | 3 | Partial capture |
| 10-13 23:32 | 80m | - / - | ON7VZ | -1 / - | 3 | Partial capture |
| 10-13 23:26 | 80m | - / -11 | RX3ASQ | +9 / - | 4 | ✓ Closing fragment |
| 10-13 23:23 | 80m | - / +7 | DL/AD2LX | +2 / - | 4 | Partial capture |
| 10-13 23:22 | 80m | +3 / - | IQ4JO | +13 / +2 | 4 | Partial capture |
| 10-13 23:21 | 80m | -2 / -16 | P36UKE/R | +13 / - | 3 | Partial capture |
| 10-13 23:15 | 80m | +19 / +9 | OH6FSO | -3 / -19 | 6 | ✓ Full exchange observed |
| 10-13 23:11 | 80m | -3 / - | ON6PL | - / - | 2 | Partial capture |
| 10-13 22:54 | 80m | 0 / - | UA3VVA | +4 / -7 | 9 | ✓ Closing observed |
| 10-13 22:48 | 80m | -1 / -18 | RK5M | +14 / 0 | 7 | ✓ Full exchange observed |
| 10-13 22:44 | 80m | -3 / - | DO8JB | 0 / +3 | 11 | Partial capture |
| 10-13 22:41 | 80m | -5 / -13 | US2YW | +13 / +9 | 8 | ✓ Full exchange observed |
| 10-13 22:40 | 80m | +2 / +3 | HB3XGP | -3 / +4 | 5 | ✓ Full exchange observed |
| 10-13 22:33 | 80m | -4 / - | G4DZE | - / - | 2 | Partial capture |
| 10-13 22:28 | 80m | +3 / -1 | DO9BAU | +9 / - | 5 | ✓ Full exchange observed |
| 10-13 22:20 | 80m | -3 / -2 | G8BCG | -4 / -8 | 5 | ✓ Full exchange observed |
| 10-13 21:59 | 80m | -8 / - | LB9ZG | -5 / 0 | 5 | ✓ Full exchange observed |
| 10-13 21:56 | 80m | -7 / +8 | DH1KJ | +7 / +5 | 5 | ✓ Full exchange observed |
| 10-13 21:55 | 80m | -7 / -21 | IZ8XXE | +11 / -13 | 5 | ✓ Full exchange observed |
| 10-13 21:52 | 80m | - / +1 | DL/AD2LX | +2 / - | 2 | Partial capture |
| 10-13 21:49 | 80m | -7 / -11 | IU5VMC | +3 / -2 | 6 | ✓ Full exchange observed |
| 10-13 21:47 | 80m | - / -8 | EA4HPY | +2 / - | 2 | ✓ Closing fragment |
| 10-13 21:40 | 80m | +4 / -4 | SP5MXZ | +6 / +7 | 5 | ✓ Full exchange observed |
| 10-13 21:38 | 80m | +5 / +3 | LA4NM | +2 / +4 | 7 | ✓ Full exchange observed |
| 10-13 21:37 | 80m | +9 / -2 | TF4M | -12 / -7 | 5 | ✓ Full exchange observed |
| 10-13 21:32 | 80m | -8 / - | DH0ZAL | -20 / -15 | 4 | ✓ Closing observed |
| 10-13 21:31 | 80m | -6 / +1 | DL7ACN | +1 / - | 8 | ✓ Full exchange observed |
| 10-13 21:27 | 80m | -9 / -4 | ON1BH | +2 / +1 | 4 | Partial capture |
| 10-13 21:26 | 80m | -8 / +8 | ON5MEV | +1 / -1 | 4 | ✓ Full exchange observed |
| 10-13 21:23 | 80m | - / -7 | LY2MM | +8 / - | 2 | ✓ Closing fragment |
| 10-13 21:17 | 80m | +3 / -2 | SP6FME | +16 / +8 | 5 | ✓ Full exchange observed |
| 10-13 21:15 | 80m | +6 / - | DO9SAM | +16 / - | 3 | ✓ Closing observed |
| 10-13 21:14 | 80m | -3 / -8 | ON2BCB | -2 / +8 | 5 | ✓ Full exchange observed |
| 10-13 21:09 | 80m | -6 / -6 | DP75BAC | +3 / -1 | 3 | Partial capture |
| 10-13 00:00 | 80m | +4 / -1 | SP4DLD | -1 / - | 3 | ✓ Closing observed |
| 10-12 23:58 | 80m | +2 / -9 | DO9BAU | +12 / - | 5 | ✓ Full exchange observed |
| 10-12 23:56 | 80m | +2 / +2 | LB6NK | -11 / -8 | 5 | ✓ Full exchange observed |
| 10-12 23:51 | 80m | +2 / - | G7KCK | -7 / - | 3 | ✓ Closing observed |
| 10-12 23:49 | 80m | +2 / - | SM7TZK | - / +1 | 3 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 222915 -22 1387 WA4KBM DF4FS -24 222945 -24 1387 YO6LM DF4FS -14 223000 -19 2076 DF4FS YO6LM R-04 (x2) 223115 -19 1387 SP9JCN DF4FS -14 223215 -21 1386 CQ DF4FS JN48 224430 -11 313 RD3FY DF4FS JN48 (x2) 224730 -6 1115 DF4FS CS8ABF -16 (x2) 224930 -9 1070 DF4FS EB5CS R-05 231700 -14 1402 DF4FS IT9BYL RR73 232000 -4 1834 DF4FS SV3AUW -18 (x3)
UTC dB Audio Message 004345 +10 1755 DF4FS OK1HEH -01 (x2) 004730 -6 1400 OK1HEH DF4FS R+01 004745 +4 1755 DF4FS OK1HEH RR73 004800 -1 1400 OK1HEH DF4FS 73 004815 +7 1400 DF4FS RN6HK LN14 004830 -9 1400 RN6HK DF4FS +01 004845 +5 1400 DF4FS RN6HK LN14 005000 -8 1400 RN6HK DF4FS +07 005100 -5 1694 GM6URC DF4FS JN48 005115 -8 1693 DF4FS GM6URC -05 005130 -4 1694 GM6URC DF4FS R+00 005145 -8 1694 DF4FS GM6URC RR73 005200 -3 1694 GM6URC DF4FS 73 010330 +2 2044 IS0BOY DF4FS JN48
UTC dB Audio Message 185000 -10 1082 G7RTI DF4FS RR73 185030 -13 1082 CQ DF4FS JN48 185045 +3 2809 DF4FS S57BTI JN75 185045 -2 2219 DF4FS IK4CBO JN54 185945 -10 2039 BD8ENU DF4FS JN48 191000 -1 2039 DF4FS BD8ENU -09 191015 -7 2039 BD8ENU DF4FS R-13 191030 -7 2039 DF4FS BD8ENU RR73 191045 -7 2039 BD8ENU DF4FS 73 213900 +7 2351 DF4FS F5HNQ IN98 214030 -20 2126 DF4FS EA3BMU JN01 214630 -9 1249 DF4FS EA4D IN80 215100 +4 2351 DF4FS F5HNQ IN98 215200 -5 489 DF4FS 4L7T LN21 (x2)
UTC dB Audio Message 235615 +0 1360 R4FDK DF4FS JN48 (x3) 235930 +3 1360 DF4FS R4FDK -20 235945 -8 1360 R4FDK DF4FS R-16 000000 +1 1360 DF4FS R4FDK RR73 000015 -4 1360 R4FDK DF4FS R-16 (x2) 000100 -9 1928 DF4FS SP9OJ JN99 000100 +4 1360 DF4FS R4FDK RR73 000245 -12 1360 R4FDK DF4FS JN48 000300 +2 1360 DF4FS R4FDK -18 000315 -7 1360 R4FDK DF4FS R-14 000330 -1 1360 DF4FS R4FDK RR73 000345 -8 1360 R4FDK DF4FS 73
UTC dB Audio Message 190500 +14 720 DF4FS PD3LKN 73 192015 +3 1832 DF4FS R3NBI -14 192500 -15 1138 DF4FS YL2KF -07 (x2) 220115 -24 1808 DF4FS VE1MDF -14 220345 -18 827 KA0SOC DF4FS JN48 223845 -12 728 DF4FS K4YT RR73 231315 -16 826 WV2B DF4FS JN48 (x3) 231745 -11 826 PY8WW DF4FS JN48 231915 -9 826 YL3RZ DF4FS JN48 232015 -12 826 CQ DF4FS JN48 (x3)
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.
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee