ON4CJU — reception at SO8OO
Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.
FT8 activity
Receiver-side FT8 activity involving ON4CJU, decoded by SO8OO in southeastern Poland. 6,637 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, across 60 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-19.
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 6,637 FT8 messages attributed to ON4CJU as the transmitting token by decoded message structure across 60 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (52%), followed by 20 m (23%) and 80 m (21%). Most decodes (68%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -7 dB.
Overview
Bands
Last attributed message: 2026-10-19 10:20 UTC
Observed FT8 message patterns
- Attributed sample
- 6,637 messages
- Active dates
- 60 UTC dates
- Estimated median S/N
- -7 dB
- Estimated 10th-90th percentile
- -16 to +4 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 718, moderate (-15 to -9 dB) 2,038, strong (≥ -8 dB) 3,881.
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 ON4CJU 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 ON4CJU
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
- JO20 · 4,475 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,194 km (approx.)
- Last such locator decoded
- 2026-10-19 10:20 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 | ON4CJU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-19 09:20 | 40m | - / -9 | OE3ZIO | -14 / - | 2 | ✓ Closing fragment |
| 10-19 09:20 | 40m | - / -15 | OK2TKU | -16 / - | 2 | Partial capture |
| 10-19 09:08 | 40m | - / -17 | OK2TKU | -22 / - | 2 | Partial capture |
| 10-18 08:55 | 40m | -15 / +8 | DD3ZZ | -2 / -12 | 3 | ✓ Full exchange observed |
| 10-17 19:11 | 40m | 0 / - | SQ1EIC | - / -11 | 2 | ✓ Closing fragment |
| 10-17 19:09 | 40m | 0 / - | OZ9MSD | - / -10 | 2 | ✓ Closing fragment |
| 10-17 19:08 | 40m | +3 / -7 | F1PBZ | -2 / +6 | 4 | ✓ Full exchange observed |
| 10-17 19:03 | 40m | -1 / - | YL3FW | - / -8 | 2 | ✓ Closing fragment |
| 10-17 18:59 | 40m | -3 / -2 | DG7NT | -10 / -4 | 5 | ✓ Full exchange observed |
| 10-17 18:47 | 40m | -4 / - | R3PLA | - / -23 | 2 | ✓ Closing fragment |
| 10-17 18:39 | 40m | -3 / - | M7DFM | -12 / -4 | 2 | ✓ Closing observed |
| 10-17 18:20 | 40m | -4 / - | PE1BOL | - / -1 | 6 | Partial capture |
| 10-17 18:18 | 40m | -1 / -10 | UT3UEH | -5 / -3 | 6 | ✓ Full exchange observed |
| 10-17 18:15 | 40m | - / - | R5BM/M | -10 / - | 3 | Partial capture |
| 10-17 18:06 | 40m | -6 / - | OK3WOD | - / -6 | 2 | ✓ Closing fragment |
| 10-17 18:04 | 40m | -3 / -9 | R6DVS | +5 / +6 | 5 | ✓ Full exchange observed |
| 10-17 17:59 | 40m | - / -8 | DM2MR | -2 / - | 4 | ✓ Closing fragment |
| 10-17 17:51 | 40m | - / -19 | UR5VLC | -5 / - | 3 | ✓ Closing fragment |
| 10-17 17:44 | 40m | - / -13 | EA3ACQ | -5 / - | 3 | ✓ Closing fragment |
| 10-17 17:38 | 40m | -2 / -5 | R4HNT | -2 / -4 | 6 | ✓ Full exchange observed |
| 10-17 17:32 | 40m | -4 / - | OE1AIV | - / -24 | 6 | Partial capture |
| 10-17 14:10 | 40m | -13 / - | DH5IS | - / +3 | 2 | ✓ Closing fragment |
| 10-17 14:07 | 40m | -12 / - | DF3VX | - / +4 | 2 | ✓ Closing fragment |
| 10-17 14:06 | 40m | -13 / - | PA1HEM | - / -23 | 2 | ✓ Closing fragment |
| 10-17 12:31 | 40m | -11 / +2 | PA6VLG | -20 / - | 2 | ✓ Closing observed |
| 10-17 11:47 | 40m | -13 / - | DJ3HW | -12 / - | 5 | ✓ Full exchange observed |
| 10-17 11:05 | 40m | - / -17 | OK2WID | -4 / - | 2 | ✓ Closing fragment |
| 10-17 10:56 | 40m | - / - | PC2X | -12 / - | 2 | ✓ Closing fragment |
| 10-14 12:30 | 40m | - / +2 | YL2FD | 0 / - | 3 | ✓ Closing fragment |
| 10-13 19:33 | 40m | - / +1 | UA3SCU | -4 / - | 2 | Partial capture |
| 10-13 19:26 | 40m | -4 / - | BA5AW | - / -14 | 4 | ✓ Closing fragment |
| 10-13 19:16 | 40m | -3 / - | YL3AUL | - / -24 | 2 | ✓ Closing fragment |
| 10-13 19:15 | 40m | 0 / - | OK2SIR | - / -12 | 2 | ✓ Closing fragment |
| 10-13 19:13 | 40m | -1 / - | F4NFM | - / +1 | 2 | ✓ Closing fragment |
| 10-13 19:05 | 40m | - / -12 | F5NNN | -3 / - | 3 | ✓ Closing fragment |
| 10-13 19:03 | 40m | -8 / -8 | R5AV | -2 / +5 | 4 | ✓ Full exchange observed |
| 10-13 19:01 | 40m | -10 / - | UT3UEH | - / -3 | 3 | ✓ Closing fragment |
| 10-13 18:59 | 40m | -12 / +4 | OE2JKN | -14 / - | 3 | ✓ Closing observed |
| 10-13 18:56 | 40m | -13 / -12 | DL9NN | -6 / -14 | 5 | ✓ Full exchange observed |
| 10-13 18:42 | 40m | -9 / -15 | RX9WM | -15 / -5 | 3 | ✓ Full exchange observed |
| 10-13 18:40 | 40m | - / - | PD5BT | -11 / - | 2 | Partial capture |
| 10-13 18:33 | 40m | -8 / - | G0HZG | - / +3 | 2 | ✓ Closing fragment |
| 10-13 18:29 | 40m | -9 / - | SP2ZST | - / -10 | 6 | Partial capture |
| 10-13 18:24 | 40m | 0 / -12 | RA3LBW | -12 / -4 | 5 | ✓ Full exchange observed |
| 10-13 18:21 | 40m | - / -3 | R3DMX | -4 / - | 3 | ✓ Closing fragment |
| 10-13 18:16 | 40m | -4 / - | M6UCD | - / -8 | 2 | ✓ Closing fragment |
| 10-13 18:14 | 40m | 0 / -7 | RX3VF | -14 / -4 | 4 | ✓ Full exchange observed |
| 10-13 18:08 | 40m | -8 / - | SP2ADI | - / +2 | 2 | ✓ Closing fragment |
| 10-13 18:06 | 40m | -6 / -21 | R6LQU | -9 / -8 | 5 | ✓ Full exchange observed |
| 10-13 17:49 | 40m | -7 / - | HB9ELE | +15 / - | 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 094115 -21 2252 CQ ON4CJU JO20 (x8) 100515 -20 2252 ON4CJU PB0ACU R+07 100730 -21 2252 CQ ON4CJU JO20 a1 (x6)
UTC dB Audio Message 213745 -4 917 CQ ON4CJU JO20 213815 -2 917 DO1ANB ON4CJU -24 (x5) 214215 +8 691 CQ ON4CJU JO20 (x2) 214315 +8 691 M6RVA ON4CJU -24 (x2) 214415 +3 691 CQ ON4CJU JO20 214445 +10 691 M6RVA ON4CJU RR73 (x2) 214545 +9 691 CQ ON4CJU JO20 (x2)
UTC dB Audio Message 174015 -16 1660 CQ ON4CJU JO20 (x3) 174130 -16 2394 ON4CJU SQ9LOJ JO90 (x3) 174245 -19 1661 CQ ON4CJU JO20 (x9)
UTC dB Audio Message 201330 -1 1709 ON4CJU DO2RG -06 (x2) 201600 -7 1092 ON4CJU PA3FR JO33 (x3) 193545 -19 1990 ON4CJU DF9JL R-04 194745 -5 1545 ON4CJU DJ3JD JO52 (x3)
UTC dB Audio Message 121830 +7 2518 CQ ON4CJU JO20 (x15)
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.
CW
No CW receptions recorded for this callsign in the last 30 days.
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