R4CJA — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving R4CJA, decoded by SO8OO in southeastern Poland. 11 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-06-18.
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 11 FT8 messages attributed to R4CJA as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -1 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 11 messages
- Active dates
- 1 UTC dates
- Estimated median S/N
- -1 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 1, strong (≥ -8 dB) 10.
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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).
Frequent counterpart tokens observed at SO8OO
Tokens most often paired with R4CJA in decoded directed-looking exchanges:
Most frequent locator attributed to R4CJA
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
- LO11 · 9 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,498 km (approx.)
- Last such locator decoded
- 2026-06-18 19:12 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 | R4CJA S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 07-19 07:56 | 10m | - / -3 | 9A2RD | +4 / - | 2 | ✓ Closing fragment |
| 07-18 19:52 | 10m | - / - | DN9OPA | -9 / - | 3 | Partial capture |
| 07-18 19:44 | 10m | - / -6 | R6OD | -8 / - | 3 | Partial capture |
| 07-18 19:44 | 10m | - / - | F4HJN | -10 / - | 2 | ✓ Closing fragment |
| 07-18 18:16 | 10m | - / - | IU0VOG | -10 / - | 2 | Partial capture |
| 06-28 06:11 | 10m | - / -11 | <...> | -5 / - | 3 | Partial capture |
| 06-27 18:26 | 10m | - / - | DL3MIB | -12 / - | 6 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 061200 -5 1657 R4CJA <...> -11 180630 -22 1990 R4CJA F4NLW/P IN88 181600 -9 2650 R4CJA IU0VOG JN61 (x2) 182545 -11 1027 R4CJA IS0BPX -25 194415 -10 1239 R4CJA F4HJN JN37 194445 -8 463 R4CJA R6OD KN87 (x2) 194545 -11 1239 R4CJA F4HJN 73 194615 -7 464 R4CJA R6OD R-06 195215 -10 2609 R4CJA DN9OPA JN38 (x3) 075615 +5 656 R4CJA 9A2RD -03 (x2)
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