R0JAC — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving R0JAC, decoded by SO8OO in southeastern Poland. 8 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-06-12 and 2026-06-16.
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 8 FT8 messages attributed to R0JAC as the transmitting token by decoded message structure across 2 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 -13 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 8 messages
- Active dates
- 2 UTC dates
- Estimated median S/N
- -13 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 6, strong (≥ -8 dB) 1.
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 R0JAC in decoded directed-looking exchanges:
Most frequent locator attributed to R0JAC
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
- PO41 · 5 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 6,815 km (approx.)
- Last such locator decoded
- 2026-06-16 22:25 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 | R0JAC S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-30 23:32 | 20m | - / -15 | OK2CNI | +12 / - | 2 | ✓ Closing fragment |
| 08-27 21:27 | 20m | - / - | S57LU | -3 / - | 3 | Partial capture |
| 08-27 04:08 | 20m | - / -6 | R3UAX | +8 / - | 2 | ✓ Closing fragment |
| 08-23 23:46 | 20m | - / -25 | IZ5UFW | +4 / - | 2 | ✓ Closing fragment |
| 08-16 07:58 | 20m | - / -12 | RA3P | -3 / - | 2 | ✓ Closing fragment |
| 08-06 10:24 | 20m | - / -24 | <...> | -6 / - | 2 | Partial capture |
| 07-30 23:00 | 20m | - / -17 | EC3A | -17 / - | 2 | Partial capture |
| 07-23 03:59 | 20m | - / - | RN3ZBX | -10 / - | 2 | ✓ Closing fragment |
| 07-22 07:05 | 10m | - / -22 | R3OR | -5 / - | 2 | ✓ Closing fragment |
| 07-13 06:21 | 20m | - / - | HB9TIH | -19 / - | 4 | Partial capture |
| 07-13 03:42 | 20m | - / -22 | RW4HBG | -13 / - | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 075800 -4 514 R0JAC RA3P -12 (x2) 001245 -23 1874 R0JAC EC3A -20 234615 +5 771 R0JAC IZ5UFW R-25 (x2) 234645 +4 2134 R0JAC IQ4JO JN63 040800 +8 792 R0JAC R3UAX -06 (x2) 212345 -6 801 R0JAC F4MBU JN23 212615 -10 921 R0JAC I2SDD -18 212715 +0 980 R0JAC S57LU JN76 (x3) 233245 +12 2399 R0JAC OK2CNI -15 (x2)
UTC dB Audio Message 153300 -15 1145 R0JAC UA4FKT LO23
UTC dB Audio Message 070545 -5 1474 R0JAC R3OR -22 (x2)
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