RK4FAJ — 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 RK4FAJ, decoded by SO8OO in southeastern Poland. 1,865 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 64 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-11-07.
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 1,865 FT8 messages attributed to RK4FAJ as the transmitting token by decoded message structure across 64 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (51%), followed by 80 m (34%) and 20 m (11%). The busiest six-hour window was 23:00-05:00 UTC, containing 41% of decodes. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11.5 dB.
Overview
Bands
Last attributed message: 2026-11-07 13:10 UTC
Observed FT8 message patterns
- Attributed sample
- 1,865 messages
- Active dates
- 64 UTC dates
- Estimated median S/N
- -11.5 dB
- Estimated 10th-90th percentile
- -19.5 to -1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 530, moderate (-15 to -9 dB) 674, strong (≥ -8 dB) 661.
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 RK4FAJ 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 RK4FAJ
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
- LO23 · 1,180 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,639 km (approx.)
- Last such locator decoded
- 2026-11-07 13:10 UTC
Other locator fields attributed to this token: LO22 (6).
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 | RK4FAJ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 11-07 13:10 | 40m | -24 / - | RW3O | - / - | 2 | Partial capture |
| 11-07 03:39 | 80m | - / -14 | SP9UPH | -14 / - | 2 | ✓ Closing fragment |
| 11-07 03:27 | 80m | -16 / -19 | UA4HBR | -2 / -2 | 5 | ✓ Full exchange observed |
| 11-07 03:20 | 80m | -11 / - | HO8EZJ/P | - / -24 | 2 | Partial capture |
| 11-07 03:17 | 80m | -15 / - | DL1HBG | +6 / - | 3 | ✓ Closing observed |
| 11-07 03:02 | 80m | -8 / - | R3TE | - / -16 | 3 | ✓ Closing fragment |
| 11-07 02:57 | 80m | -8 / - | SQ9DKS | - / - | 2 | Partial capture |
| 11-07 02:55 | 80m | -4 / -3 | TA1MB | -14 / -16 | 5 | ✓ Full exchange observed |
| 11-07 02:40 | 80m | -3 / - | R9CA | - / -11 | 2 | ✓ Closing fragment |
| 11-07 02:37 | 80m | -12 / +6 | RD4HX | -14 / -10 | 4 | ✓ Full exchange observed |
| 11-07 02:35 | 80m | -9 / -10 | OK1AYM | -4 / -8 | 5 | ✓ Full exchange observed |
| 11-07 02:31 | 80m | -11 / - | R3BAG | -6 / -9 | 3 | ✓ Closing observed |
| 11-07 02:31 | 80m | - / - | PE1BOL | -16 / - | 2 | Partial capture |
| 11-07 02:29 | 80m | -6 / -14 | DO5PY | +4 / -16 | 5 | ✓ Full exchange observed |
| 11-07 02:25 | 80m | -6 / -8 | HB9EOT | +3 / -18 | 5 | ✓ Full exchange observed |
| 11-07 02:23 | 80m | -7 / -2 | SP8WB | +4 / -3 | 5 | ✓ Full exchange observed |
| 11-07 02:16 | 80m | -5 / -8 | R2DAY | -15 / -3 | 7 | ✓ Full exchange observed |
| 11-07 02:14 | 80m | -2 / - | RC6ZU | - / -8 | 2 | ✓ Closing fragment |
| 11-07 02:10 | 80m | - / - | DO5PY | -2 / - | 5 | Partial capture |
| 11-07 02:10 | 80m | -8 / -10 | F1PBZ | +7 / -17 | 4 | ✓ Full exchange observed |
| 11-07 02:09 | 80m | - / - | ON4MAP | -17 / - | 6 | Partial capture |
| 11-07 02:04 | 80m | -5 / -5 | RJ9M | -18 / -12 | 4 | ✓ Full exchange observed |
| 11-07 02:03 | 80m | -7 / -10 | DO5PY | -2 / -19 | 6 | ✓ Full exchange observed |
| 11-07 02:01 | 80m | - / -12 | DK8HC/P | -6 / - | 5 | Partial capture |
| 11-07 02:01 | 80m | -2 / - | RJ3DC | -13 / -7 | 3 | ✓ Closing observed |
| 11-07 02:00 | 80m | -4 / -4 | SP8HDC | -7 / -13 | 5 | ✓ Full exchange observed |
| 11-07 01:55 | 80m | -3 / - | RQ9O | - / -17 | 6 | ✓ Closing fragment |
| 11-06 17:52 | 80m | -17 / - | R3BFM/P | - / - | 2 | Partial capture |
| 11-06 17:11 | 40m | -3 / - | BG7BVI | - / -13 | 2 | ✓ Closing fragment |
| 11-06 17:07 | 40m | -1 / - | R0WC | - / -13 | 3 | ✓ Closing fragment |
| 11-06 17:03 | 40m | -9 / 0 | HB9ELE | +8 / -11 | 6 | ✓ Full exchange observed |
| 11-06 17:02 | 40m | -8 / -4 | R7KCK | +3 / -6 | 4 | ✓ Full exchange observed |
| 11-06 16:59 | 40m | -11 / +2 | DL6EL | +6 / -9 | 4 | ✓ Full exchange observed |
| 11-06 16:59 | 40m | - / - | PA2IPA | -6 / - | 4 | Partial capture |
| 11-06 16:56 | 80m | - / -14 | DK8HC/P | -4 / - | 5 | Partial capture |
| 11-06 15:24 | 80m | -22 / - | UA9CFH | - / - | 3 | Partial capture |
| 11-06 15:22 | 80m | -16 / - | R4FBJ | - / -12 | 3 | ✓ Closing fragment |
| 11-06 04:49 | 80m | - / -14 | OH6FSG | -14 / - | 2 | Partial capture |
| 11-05 18:14 | 80m | -13 / - | RZ3DAB | - / - | 2 | ✓ Closing fragment |
| 11-05 02:14 | 40m | -8 / - | R7RCO/M | - / - | 4 | Partial capture |
| 11-05 02:08 | 80m | -15 / - | UA9XL/P | -19 / -5 | 3 | ✓ Closing observed |
| 11-02 15:10 | 80m | -18 / - | UA9LLE | - / - | 2 | ✓ Closing fragment |
| 11-02 14:52 | 80m | -18 / - | UA4QK | -12 / -3 | 2 | ✓ Closing observed |
| 11-02 14:44 | 80m | -18 / - | RU9ST | - / -3 | 2 | Partial capture |
| 11-02 14:41 | 80m | -20 / - | EX7DY | - / -20 | 3 | ✓ Closing fragment |
| 11-02 14:32 | 40m | -10 / - | UK8FCM | - / -7 | 2 | ✓ Closing fragment |
| 11-01 04:26 | 40m | -21 / - | R9FGF | - / -8 | 2 | Partial capture |
| 11-01 04:18 | 40m | -18 / - | R6DVS | -17 / -3 | 4 | ✓ Closing observed |
| 11-01 04:16 | 40m | -24 / -8 | EA4HTI | -24 / -17 | 2 | Partial capture |
| 10-26 01:39 | 40m | -9 / - | SM5DYQ | - / -20 | 3 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 170915 -1 667 CQ RK4FAJ LO23 (x3) 171030 -9 2300 RK4FAJ F5TYY -09 171045 -7 667 CQ RK4FAJ LO23 171115 -4 667 BG7BVI RK4FAJ -13 (x2) 171300 -14 1541 RK4FAJ DL6NA JN58 171315 -3 667 CQ RK4FAJ LO23 (x5) 131015 -24 1820 RW3O RK4FAJ LO23 (x2)
UTC dB Audio Message 031630 -9 1967 CQ RK4FAJ LO23 031730 -17 1967 DL1HBG RK4FAJ LO23 031815 +6 1967 RK4FAJ DL1HBG RR73 031830 -13 1967 DL1HBG RK4FAJ 73 031900 -7 1967 CQ RK4FAJ LO23 (x2) 032045 -9 1967 HO8EZJ/P RK4FAJ LO23 (x2) 032700 -19 1968 UA4HBR RK4FAJ LO23 (x2) 032815 -2 1612 RK4FAJ UA4HBR -19 032830 -12 1968 UA4HBR RK4FAJ R-02 (x2) 033915 -13 2150 RK4FAJ SP9UPH -14 (x2)
UTC dB Audio Message 201345 +6 1389 RK4FAJ RZ6BS KN96 (x2) 201430 -24 1822 RZ6BS RK4FAJ RR73 201530 -22 1822 RU3DBT RK4FAJ RR73 201830 -7 2499 RK4FAJ R6JAG -03 (x2) 201930 +7 899 RK4FAJ YO9HP -17 202215 -16 898 YO9HP RK4FAJ R-21 192415 -11 927 RI1FJZ RK4FAJ LO23 (x2) 152915 -17 2173 CQ RK4FAJ LO23 152930 -16 941 RK4FAJ RU3FM KO94 152945 -23 2173 RU3FM RK4FAJ +01 (x2) 153115 -19 2173 R9YCV RK4FAJ -20
UTC dB Audio Message 134215 +10 2915 RI0FA RK4FAJ -15 (x3) 144500 -7 2259 R6YBU RK4FAJ LO23 235300 -24 1464 YV6BXN RK4FAJ LO23 054245 -4 2537 R8QA/M RK4FAJ LO23 (x10)
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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