RJ3DC — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving RJ3DC, decoded by SO8OO in southeastern Poland. 275 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-08-04 and 2026-08-12.
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 275 FT8 messages attributed to RJ3DC as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (60%), followed by 80 m (34%) and 40 m (4%). Most decodes (64%) fell within the six-hour window 15:00-21:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.
Overview
Bands
Last attributed message: 2026-08-12 19:13 UTC
Observed FT8 message patterns
- Attributed sample
- 275 messages
- Active dates
- 6 UTC dates
- Estimated median S/N
- -13 dB
- Estimated 10th-90th percentile
- -22 to -3 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 102, moderate (-15 to -9 dB) 84, strong (≥ -8 dB) 89.
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 RJ3DC 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 RJ3DC
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
- KO95 · 142 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,309 km (approx.)
- Last such locator decoded
- 2026-08-12 19:13 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 | RJ3DC S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 08-12 19:13 | 80m | -24 / -1 | UB3LCO | +1 / - | 4 | Partial capture |
| 08-12 19:10 | 80m | -3 / -8 | SQ9DKS | +1 / -18 | 5 | ✓ Full exchange observed |
| 08-12 19:07 | 80m | +1 / - | IU1JSG | - / - | 4 | Partial capture |
| 08-12 19:05 | 80m | -9 / - | R8CKD | - / -14 | 3 | ✓ Closing fragment |
| 08-12 19:01 | 80m | -8 / - | R9OHK | - / - | 2 | Partial capture |
| 08-12 18:57 | 80m | -9 / - | SP1905MFK | - / -13 | 3 | Partial capture |
| 08-12 18:55 | 80m | -16 / - | R2APC | -1 / +2 | 3 | ✓ Closing observed |
| 08-12 18:54 | 80m | -12 / - | SV8TCK | - / - | 2 | Partial capture |
| 08-12 18:53 | 80m | - / - | R6BH | -7 / - | 3 | Partial capture |
| 08-12 18:48 | 80m | -20 / -11 | R6FNM | -12 / -3 | 5 | ✓ Full exchange observed |
| 08-12 18:48 | 80m | - / - | E70SZ | -3 / - | 6 | Partial capture |
| 08-12 18:42 | 80m | -9 / -11 | SP8RPA | +20 / -17 | 5 | ✓ Full exchange observed |
| 08-12 18:41 | 80m | -14 / +3 | R2ZJJ | -2 / - | 2 | Partial capture |
| 08-12 18:39 | 80m | -6 / -12 | SO1CJ | +13 / - | 3 | ✓ Closing observed |
| 08-12 18:37 | 80m | -6 / -9 | SP6GCU | +19 / -6 | 5 | ✓ Full exchange observed |
| 08-11 11:56 | 20m | - / -19 | DK1AJ | -8 / - | 2 | ✓ Closing fragment |
| 08-11 11:23 | 20m | -12 / - | <...> | - / -11 | 2 | Partial capture |
| 08-11 10:46 | 20m | - / - | 9A3PV | -7 / - | 2 | ✓ Closing fragment |
| 08-11 10:29 | 20m | - / -9 | YO4FZV | -16 / - | 3 | ✓ Closing fragment |
| 08-11 10:22 | 20m | - / -3 | SP2SGZ | -4 / - | 2 | ✓ Closing fragment |
| 08-11 09:33 | 20m | - / -13 | RA6OV | -14 / - | 4 | ✓ Closing fragment |
| 08-11 09:23 | 20m | - / -9 | IK4LZH | +5 / - | 4 | Partial capture |
| 08-11 09:17 | 20m | - / -16 | M0LTA | -12 / - | 3 | ✓ Closing fragment |
| 08-11 09:15 | 20m | - / -21 | PD0MHZ | -7 / - | 2 | ✓ Closing fragment |
| 08-11 09:04 | 20m | - / -11 | 9A2RD | -2 / - | 2 | ✓ Closing fragment |
| 08-11 07:27 | 20m | - / -5 | PD1ACB | -22 / - | 2 | ✓ Closing fragment |
| 08-11 07:26 | 20m | - / - | RV6FT | -10 / - | 2 | ✓ Closing fragment |
| 08-11 07:23 | 20m | - / -7 | RW6HPI | -16 / - | 2 | ✓ Closing fragment |
| 08-11 07:22 | 20m | - / +2 | R8FH | -3 / - | 2 | ✓ Closing fragment |
| 08-11 06:14 | 20m | - / -8 | HB9TWU | -10 / - | 2 | ✓ Closing fragment |
| 08-11 06:11 | 20m | - / - | EW7AS | -17 / - | 3 | ✓ Closing fragment |
| 08-11 06:06 | 20m | -21 / - | UF4S/6 | - / - | 3 | Partial capture |
| 08-11 06:04 | 20m | - / -13 | PD2WL | -8 / - | 2 | Partial capture |
| 08-11 05:59 | 20m | - / - | F5NNN | -11 / - | 3 | Partial capture |
| 08-11 05:58 | 20m | - / - | HB9HBY | +5 / - | 2 | Partial capture |
| 08-11 05:43 | 20m | -18 / - | RV6F | - / -4 | 2 | ✓ Closing fragment |
| 08-11 05:41 | 20m | - / -11 | ON1DGN | -13 / - | 2 | ✓ Closing fragment |
| 08-11 05:31 | 20m | - / +2 | YO4NT | 0 / - | 2 | ✓ Closing fragment |
| 08-11 05:21 | 20m | -18 / - | OZ4MT | - / - | 2 | ✓ Closing fragment |
| 08-11 04:59 | 20m | - / - | EA5HEU | -7 / - | 3 | Partial capture |
| 08-11 04:51 | 20m | - / +1 | UA3GIE | -1 / - | 2 | ✓ Closing fragment |
| 08-10 21:19 | 20m | - / -7 | F5NBQ | +2 / - | 2 | ✓ Closing fragment |
| 08-10 21:16 | 20m | - / -4 | F1PBZ | -8 / - | 2 | ✓ Closing fragment |
| 08-10 21:14 | 20m | - / -3 | SV5BYP | -19 / - | 2 | ✓ Closing fragment |
| 08-10 20:12 | 20m | - / - | DH2RL | -15 / - | 2 | ✓ Closing fragment |
| 08-10 20:07 | 20m | - / - | G4DBW | -1 / - | 2 | Partial capture |
| 08-10 19:21 | 20m | - / +3 | RN3OG | -6 / - | 2 | Partial capture |
| 08-10 05:55 | 20m | - / -1 | DL3HBF | +3 / - | 3 | ✓ Closing fragment |
| 08-10 05:53 | 20m | -20 / - | F1MLN | - / - | 2 | Partial capture |
| 08-10 05:53 | 20m | - / -15 | IU2THY | +1 / - | 4 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 190715 -2 493 IU1JSG RJ3DC KO95 (x2) 190815 -1 493 CQ RJ3DC KO95 190845 +3 494 IU1JSG RJ3DC KO95 (x2) 190945 +2 494 CQ RJ3DC KO95 191015 -3 1354 SQ9DKS RJ3DC KO95 (x2) 191100 +0 1355 RJ3DC SQ9DKS -08 191115 -4 1356 SQ9DKS RJ3DC R-18 191130 +2 1355 RJ3DC SQ9DKS RR73 191330 -24 1498 UB3LCO RJ3DC KO95 191345 +2 1496 RJ3DC UB3LCO -01 (x3)
UTC dB Audio Message 093445 -15 1287 RJ3DC RA6OV 73 102245 -4 717 RJ3DC SP2SGZ -03 (x2) 102915 -16 1590 RJ3DC YO4FZV -09 102915 -19 2353 RJ3DC G4DBW R-13 102945 -13 1590 RJ3DC YO4FZV KN44 (x2) 103330 -21 2234 UN7IV RJ3DC KO95 104615 -9 1676 RJ3DC 9A3PV +11 (x2) 112315 -11 2625 <...> RJ3DC KO95 (x2) 115600 -6 2429 RJ3DC DK1AJ -19 (x2) 120230 -18 1627 RJ3DC DL5MKR -01
UTC dB Audio Message 201645 -5 2915 SP7ROH RJ3DC R-11 202345 -15 981 EN35UKR RJ3DC KO95 (x3) 205815 -24 1676 SP2GJI RJ3DC R+02 205830 -24 1675 RJ3DC SP2GJI -13 210300 +0 2957 RJ3DC UA7XA RR73 212145 -24 1964 RJ3DC JE6WOQ -03 212445 -24 1819 RJ3DC E74MG -18 (x2) 213815 -19 2119 RJ3DC PD2ET -21 220600 -2 388 RJ3DC LB7ZG RR73 024345 -18 2083 RJ3DC R6OK -12 031300 -16 1863 RJ3DC RC6D -01 032200 -16 2459 RJ3DC SV1DKR RR73
UTC dB Audio Message 204615 -21 1701 CQ RJ3DC KO95 a1 (x2) 204700 +11 296 RJ3DC SQ2BXI KN09 204700 -6 615 RJ3DC SP3PLD JO72 (x2) 204745 -14 1700 CQ RJ3DC KO95 204800 -5 1752 RJ3DC OM2WQ JN88 (x2) 204845 -19 1700 OM2WQ RJ3DC RRR 204900 -4 1752 RJ3DC OM2WQ 73 204915 -21 1700 CQ RJ3DC KO95
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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