F4JCU — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving F4JCU, decoded by SO8OO in southeastern Poland. 2,817 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, 10m, across 105 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-10-08.
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 2,817 FT8 messages attributed to F4JCU as the transmitting token by decoded message structure across 105 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (45%), followed by 40 m (35%) and 80 m (13%). Most decodes (57%) fell within the six-hour window 01:00-07:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9.3 dB.
Overview
Bands
Last attributed message: 2026-10-08 08:54 UTC
Observed FT8 message patterns
- Attributed sample
- 2,817 messages
- Active dates
- 105 UTC dates
- Estimated median S/N
- -9.3 dB
- Estimated 10th-90th percentile
- -19.9 to +2.1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 677, moderate (-15 to -9 dB) 856, strong (≥ -8 dB) 1,284.
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 F4JCU 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 F4JCU
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
- JN16 · 2,058 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,439 km (approx.)
- Last such locator decoded
- 2026-10-08 08:53 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 | F4JCU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-08 08:52 | 40m | -16 / - | IQ8DO | - / -13 | 5 | ✓ Closing fragment |
| 10-08 06:41 | 40m | -12 / - | IQ8DO | - / -12 | 5 | Partial capture |
| 10-08 04:53 | 40m | -2 / -11 | IR8PR | -15 / -13 | 4 | ✓ Full exchange observed |
| 10-08 04:33 | 40m | -19 / - | XE1RBV | - / - | 2 | Partial capture |
| 10-07 16:15 | 80m | -12 / - | TM4GGR | - / -17 | 6 | ✓ Closing fragment |
| 10-07 16:03 | 40m | -12 / - | TM4GGR | - / - | 11 | Partial capture |
| 10-07 15:57 | 40m | -7 / - | TM4GGR | - / - | 5 | Partial capture |
| 10-07 06:19 | 40m | - / - | S55A | -1 / - | 3 | Partial capture |
| 10-07 06:17 | 40m | -13 / - | IQ8DO | - / -19 | 3 | ✓ Closing fragment |
| 10-06 05:53 | 40m | -11 / - | IQ8DO | - / - | 2 | ✓ Closing fragment |
| 10-06 04:29 | 40m | -13 / - | IR8PR | - / -12 | 3 | Partial capture |
| 10-06 01:18 | 80m | -5 / - | Z61DX | - / - | 3 | Partial capture |
| 10-06 01:16 | 80m | -3 / -20 | R8LCA | -24 / - | 3 | ✓ Closing observed |
| 10-05 18:08 | 80m | - / - | UA4FKT | +8 / - | 2 | Partial capture |
| 10-05 04:26 | 40m | -17 / - | IR8PR | - / -23 | 2 | Partial capture |
| 10-05 02:19 | 40m | -14 / - | TI5KLH | - / - | 3 | Partial capture |
| 10-05 02:14 | 40m | -13 / - | CM7ADV | - / - | 7 | Partial capture |
| 10-05 02:11 | 40m | -7 / - | TI5KLH | - / - | 2 | Partial capture |
| 10-05 02:04 | 40m | -8 / - | WP4TUN | - / - | 6 | Partial capture |
| 10-05 01:57 | 40m | -7 / - | TI5KLH | - / - | 3 | Partial capture |
| 10-05 01:52 | 40m | -5 / - | NS4P | - / - | 7 | Partial capture |
| 10-05 01:49 | 40m | -9 / - | CM7DJG | - / - | 3 | Partial capture |
| 10-05 01:46 | 40m | -8 / -12 | IQ8DO | -22 / -11 | 7 | ✓ Full exchange observed |
| 10-05 01:41 | 40m | 0 / - | CX6TU | - / -22 | 4 | ✓ Closing fragment |
| 10-05 01:38 | 40m | 0 / - | J48S | - / -17 | 2 | Partial capture |
| 10-05 01:36 | 40m | - / - | DO7KGB | -20 / - | 2 | Partial capture |
| 10-05 01:35 | 40m | -1 / - | PY5ZHP | - / - | 3 | Partial capture |
| 10-05 01:29 | 40m | -7 / -19 | PY5ZHP | -16 / -15 | 6 | Partial capture |
| 10-04 05:53 | 40m | -8 / - | IR8PR | - / - | 2 | Partial capture |
| 10-04 05:41 | 40m | -8 / - | IR8PR | - / - | 2 | Partial capture |
| 10-04 05:29 | 40m | -6 / - | IR8PR | - / - | 4 | Partial capture |
| 10-04 05:16 | 40m | -3 / - | IR8PR | - / - | 3 | Partial capture |
| 10-04 05:10 | 40m | -4 / - | IR8PR | - / - | 3 | Partial capture |
| 10-04 04:55 | 40m | -3 / - | IR8PR | - / - | 22 | Partial capture |
| 10-04 04:52 | 40m | +2 / - | HI3LER | - / - | 2 | Partial capture |
| 10-04 04:45 | 40m | 0 / - | F4MXT/P | - / - | 2 | Partial capture |
| 10-04 04:21 | 40m | -2 / - | IQ8DO | - / -23 | 3 | ✓ Closing fragment |
| 10-04 04:14 | 40m | 0 / -20 | IQ8DO | -16 / -21 | 12 | ✓ Full exchange observed |
| 10-03 13:13 | 40m | -21 / - | IQ8DO | - / - | 2 | Partial capture |
| 10-03 13:10 | 40m | -18 / - | IQ8DO | - / - | 2 | Partial capture |
| 10-03 13:08 | 40m | -17 / - | IU8QRL | -18 / - | 2 | ✓ Closing observed |
| 10-03 07:24 | 40m | -14 / - | IU8CEU | - / -11 | 2 | Partial capture |
| 10-03 04:17 | 40m | -1 / - | HG0NPJ | - / +1 | 3 | ✓ Closing fragment |
| 10-03 02:58 | 40m | +2 / - | HK3W | - / - | 2 | Partial capture |
| 10-03 02:43 | 40m | -5 / - | VE3HLM | - / - | 6 | Partial capture |
| 10-03 02:40 | 40m | -2 / - | WA8CAC | - / - | 6 | Partial capture |
| 10-03 02:36 | 40m | - / - | RZ4FWA | -14 / - | 2 | Partial capture |
| 10-03 02:34 | 40m | +2 / -12 | Z61DX | -10 / +1 | 3 | Partial capture |
| 09-30 04:57 | 80m | -6 / -15 | SN100PKP | +4 / -25 | 3 | Partial capture |
| 09-30 04:16 | 80m | -14 / - | HF100PKP | - / - | 7 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 045145 -19 1527 HJ6UMR F4JCU JN16 045330 -16 1392 F4JCU IR8PR -11 045345 -2 1528 IR8PR F4JCU R-13 045400 -14 1392 F4JCU IR8PR RR73 045415 -3 1528 IR8PR F4JCU 73 064115 -16 1525 IQ8DO F4JCU JN16 (x10)
UTC dB Audio Message 180830 +8 1498 F4JCU UA4FKT LO23 184915 +0 1997 F4JCU IV3JTG JN65 011615 -3 1497 R8LCA F4JCU JN16 011630 -24 1503 F4JCU R8LCA -20 (x2) 011800 -10 1595 F4JCU DL4DP JO31 011830 -4 1497 Z61DX F4JCU JN16 (x3) 161530 -11 1495 TM4GGR F4JCU JN16 (x6)
UTC dB Audio Message 194215 -20 1493 SO100PKP F4JCU JN16 (x8) 195400 +9 1963 F4JCU RR73; ON6MX <...> +02 200515 -24 1493 SO100PKP F4JCU JN16 200530 +0 2232 F4JCU SP100PKP -21 (x2) 194315 -18 1493 LZ936BA F4JCU JN16 194400 +12 1069 F4JCU RR73; SP2BZ <...> -06 042300 -24 1502 OH0Z F4JCU JN16
UTC dB Audio Message 142300 +8 1543 IN3LIA/P F4JCU R-13 (x4) 162530 -1 1544 <...> F4JCU JN16 (x4) 163115 -9 1544 F4JCU R6FX LN14 (x4) 193045 +8 1551 II7MGBT F4JCU JN16 (x3)
UTC dB Audio Message 194445 -5 1523 F4EWK F4JCU JN16 194500 -13 1057 F4JCU F4EWK +10 194515 +0 1522 F4EWK F4JCU R-04 194530 -10 1057 F4JCU F4EWK RR73 194545 -4 1522 F4EWK F4JCU 73 194645 -8 1523 II7MGXX F4JCU JN16 (x8) 195300 -9 2182 F4JCU II7MGBR -03 195315 -9 1522 II7MGXX F4JCU R-11
UTC dB Audio Message 160215 -21 1525 CR5VP F4JCU R-04 090400 -17 1532 <...> F4JCU JN16 (x11) 083730 +4 1252 F4JCU RR73; IK8TMF <...> -06 150200 -19 1531 <...> F4JCU JN16 (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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