ON4CFB — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving ON4CFB, decoded by SO8OO in southeastern Poland. 65 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 4 UTC dates in the available aggregate history. Observed between 2026-07-08 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 65 FT8 messages attributed to ON4CFB as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (86%), followed by 40 m (14%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -16 dB.
Overview
Bands
Last attributed message: 2026-08-28 19:10 UTC
Observed FT8 message patterns
- Attributed sample
- 65 messages
- Active dates
- 4 UTC dates
- Estimated median S/N
- -16 dB
- Estimated 10th-90th percentile
- -22 to -13 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 38, moderate (-15 to -9 dB) 27, strong (≥ -8 dB) 0.
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 ON4CFB 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 ON4CFB
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
- JO21 · 29 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,192 km (approx.)
- Last such locator decoded
- 2026-08-28 19:10 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 | ON4CFB S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-28 19:07 | 80m | -14 / - | F4IIX | -11 / -7 | 6 | ✓ Closing observed |
| 08-28 19:05 | 80m | -20 / -16 | OH4JFN | -8 / -2 | 5 | ✓ Full exchange observed |
| 08-28 19:03 | 80m | -18 / - | RD9U | - / - | 4 | Partial capture |
| 08-28 18:59 | 80m | -16 / -6 | OH5KNL | -2 / -2 | 4 | ✓ Full exchange observed |
| 08-28 18:56 | 80m | - / -21 | RA2FU | -18 / - | 2 | ✓ Closing fragment |
| 08-28 18:48 | 80m | -17 / - | ZS6WAB | - / - | 7 | Partial capture |
| 08-28 18:46 | 80m | -16 / -13 | YO4NT | +6 / - | 3 | ✓ Closing observed |
| 08-28 18:45 | 80m | -17 / -14 | 9A2AJ | -4 / - | 3 | ✓ Closing observed |
| 08-03 19:29 | 80m | -15 / - | F5RRS | -4 / - | 3 | ✓ Closing observed |
| 08-03 19:26 | 80m | -16 / -13 | YL2NX | +4 / - | 6 | ✓ Closing observed |
| 08-03 19:20 | 80m | -16 / - | A71XX | - / - | 7 | Partial capture |
| 08-03 18:56 | 40m | -22 / - | R6FX | -22 / -8 | 3 | ✓ Closing observed |
| 08-03 18:53 | 40m | - / -7 | DL9KM | -14 / - | 3 | Partial capture |
| 07-23 19:05 | 80m | -21 / -23 | LY2MM | +9 / -1 | 9 | Partial capture |
| 07-23 19:03 | 80m | -14 / -2 | OE5HHR | +4 / -13 | 5 | ✓ Full exchange observed |
| 07-23 19:00 | 80m | -14 / +7 | HB9AKB | -16 / -1 | 5 | ✓ Full exchange observed |
| 07-23 18:53 | 80m | -14 / -17 | SP4SHL | +3 / -13 | 18 | ✓ Full exchange observed |
| 07-23 18:52 | 80m | -16 / -8 | OK2NMA | +9 / -10 | 5 | ✓ Full exchange observed |
| 07-08 18:50 | 40m | - / -5 | OE8PIT | -6 / - | 6 | ✓ Closing fragment |
| 07-08 18:49 | 40m | - / - | RK3AQ | -10 / - | 2 | ✓ Closing fragment |
| 07-08 18:47 | 40m | -19 / - | SM5ZAD | - / -6 | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 190330 -20 1126 RD9U ON4CFB JO21 (x4) 190515 -9 1503 ON4CFB OH4JFN KP32 190530 -23 1125 OH4JFN ON4CFB -02 190545 -9 1125 ON4CFB OH4JFN R-16 190600 -17 1125 OH4JFN ON4CFB RR73 190645 -7 1123 ON4CFB OH4JFN 73 190715 -11 690 ON4CFB F4IIX IN95 190730 -12 1125 F4IIX ON4CFB -07 (x2) 190815 -11 690 ON4CFB F4IIX 73 190930 -16 1125 F4IIX ON4CFB JO21 (x2)
UTC dB Audio Message 185045 -9 341 ON4CFB OE8PIT JN66 (x6) 185715 -18 1327 OZ5ABO ON4CFB 73 185900 -22 1378 UN8DSW ON4CFB JO21 185330 -17 1151 ON4CFB OE6TNO 73 185330 -14 1347 ON4CFB DL9KM JN68 (x3) 185645 -21 1448 R6FX ON4CFB -08 (x2) 185800 -22 1448 ON4CFB R6FX 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.
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee