R4FCK — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving R4FCK, decoded by SO8OO in southeastern Poland. 822 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 37 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-14.
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 822 FT8 messages attributed to R4FCK as the transmitting token by decoded message structure across 37 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (51%), followed by 40 m (41%) and 10 m (7%). Most decodes (73%) fell within the six-hour window 12:00-18:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.
Overview
Bands
Last attributed message: 2026-09-14 15:47 UTC
Observed FT8 message patterns
- Attributed sample
- 822 messages
- Active dates
- 37 UTC dates
- Estimated median S/N
- -12 dB
- Estimated 10th-90th percentile
- -20 to -4 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 226, moderate (-15 to -9 dB) 347, strong (≥ -8 dB) 249.
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 R4FCK 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 R4FCK
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 · 513 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,639 km (approx.)
- Last such locator decoded
- 2026-09-14 15:47 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 | R4FCK S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-14 15:45 | 40m | -15 / - | UC9V | - / - | 2 | Partial capture |
| 09-14 15:43 | 40m | -8 / - | UN7FBW | - / - | 2 | Partial capture |
| 09-14 15:37 | 40m | -7 / -8 | LA5AKA | -7 / -21 | 5 | ✓ Full exchange observed |
| 09-14 15:28 | 40m | -17 / +1 | R3KJF | -4 / - | 5 | ✓ Closing observed |
| 09-14 15:27 | 40m | - / +2 | RW3PI | 0 / - | 2 | ✓ Closing fragment |
| 09-14 15:25 | 40m | -19 / - | SN31ROT | - / -14 | 2 | Partial capture |
| 09-14 15:22 | 40m | -22 / -8 | DL3DQL/P | -2 / -17 | 6 | ✓ Full exchange observed |
| 09-14 15:15 | 40m | -18 / +2 | RW6HPI | -2 / - | 5 | ✓ Full exchange observed |
| 09-12 16:09 | 40m | -14 / -10 | RU3ACA | -8 / - | 3 | ✓ Closing observed |
| 09-12 16:07 | 40m | -5 / -12 | OZ1A | -10 / - | 2 | Partial capture |
| 09-12 16:04 | 40m | -12 / - | R3UCC/P | - / - | 2 | Partial capture |
| 09-12 15:59 | 40m | -15 / - | R9LY | -5 / - | 2 | ✓ Closing observed |
| 09-12 15:39 | 40m | -10 / -24 | DH8BAB | -2 / - | 6 | Partial capture |
| 09-12 15:38 | 40m | - / -16 | PA3EWP | -4 / - | 3 | Partial capture |
| 09-12 15:33 | 40m | -11 / - | UB6LUR | - / +2 | 2 | Partial capture |
| 09-12 15:32 | 40m | - / +8 | RD6OX | +6 / - | 2 | ✓ Closing fragment |
| 09-12 15:30 | 40m | - / -8 | R4FV | +7 / - | 2 | Partial capture |
| 09-12 15:29 | 40m | -22 / -10 | II6IALU | -2 / - | 3 | Partial capture |
| 09-12 15:26 | 40m | -10 / - | R9WCH | - / -7 | 2 | Partial capture |
| 09-12 15:18 | 40m | -23 / +3 | UA3GDJ | -1 / - | 3 | ✓ Full exchange observed |
| 09-12 15:14 | 40m | -10 / -9 | R4PEQ | -8 / - | 4 | ✓ Full exchange observed |
| 09-12 15:05 | 40m | -17 / 0 | RK4F | -12 / - | 4 | ✓ Closing observed |
| 09-12 15:03 | 40m | -18 / +3 | UA3PTK | -7 / - | 3 | ✓ Closing observed |
| 09-09 15:36 | 40m | -12 / - | 9A7BB | - / - | 2 | Partial capture |
| 09-08 17:50 | 40m | -16 / -6 | SM5FQQ | -2 / -9 | 3 | ✓ Full exchange observed |
| 09-08 17:48 | 40m | -5 / -15 | F5RRS | +4 / -8 | 5 | ✓ Full exchange observed |
| 09-08 17:45 | 40m | -8 / - | DJ0ABM | -8 / -16 | 6 | ✓ Closing observed |
| 09-08 17:40 | 40m | -9 / - | PD1B | - / - | 4 | Partial capture |
| 09-08 17:31 | 40m | -14 / - | RM6OM | -7 / -9 | 4 | ✓ Closing observed |
| 09-08 17:24 | 40m | -6 / - | RN3YN | -3 / -3 | 13 | Partial capture |
| 09-08 16:49 | 40m | -4 / -13 | 9A170NT | +1 / - | 5 | Partial capture |
| 09-08 16:47 | 40m | - / 0 | R6XW | -18 / - | 3 | ✓ Closing fragment |
| 09-08 16:45 | 40m | -11 / -9 | DH9DR | +8 / -9 | 5 | ✓ Full exchange observed |
| 09-08 16:41 | 40m | - / -12 | M0ICR | -4 / - | 2 | Partial capture |
| 09-08 16:39 | 40m | -9 / - | R1BQW | - / 0 | 3 | ✓ Closing fragment |
| 09-08 16:38 | 40m | - / -6 | DG1KFR | -10 / - | 10 | Partial capture |
| 09-08 16:36 | 40m | -5 / -13 | OZ/OO4O | -1 / -7 | 2 | Partial capture |
| 09-06 16:57 | 40m | -11 / -1 | UA3FO | -5 / +8 | 5 | ✓ Full exchange observed |
| 09-06 16:55 | 40m | -12 / -12 | R9FAK | -18 / - | 3 | ✓ Closing observed |
| 09-06 16:53 | 40m | - / +2 | RW1C | -4 / - | 2 | ✓ Closing fragment |
| 09-06 16:49 | 40m | - / -14 | SP3SXS | -3 / - | 2 | ✓ Closing fragment |
| 09-06 16:48 | 40m | -9 / -1 | RZ6ALZ | +2 / -2 | 5 | ✓ Full exchange observed |
| 09-06 16:44 | 40m | -10 / -15 | SP2PAQ | +6 / -19 | 5 | ✓ Full exchange observed |
| 09-06 16:44 | 40m | -8 / -6 | RA9QBR | -16 / -2 | 4 | ✓ Full exchange observed |
| 09-06 16:38 | 40m | +2 / -5 | RA9DZ | -1 / -8 | 5 | ✓ Full exchange observed |
| 09-06 16:36 | 40m | -8 / - | YO3GJE | -8 / -13 | 7 | ✓ Closing observed |
| 09-06 16:32 | 40m | -4 / - | R2LM | - / -9 | 3 | ✓ Closing fragment |
| 09-06 16:30 | 40m | -7 / -5 | RU8W | +2 / +7 | 5 | ✓ Full exchange observed |
| 09-06 16:25 | 40m | -7 / - | RX3AFE | -5 / +7 | 4 | ✓ Closing observed |
| 09-06 16:25 | 40m | - / -6 | UB4HVA | -6 / - | 10 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 152845 -2 2118 R4FCK R3KJF KO91 (x2) 152930 -17 846 R3KJF R4FCK RR73 152945 -6 2118 R4FCK R3KJF 73 153030 -2 463 SM/DB9LG R4FCK LO23 153745 -5 2566 LA5AKA R4FCK LO23 153800 -5 2566 R4FCK LA5AKA -08 153845 -9 2566 LA5AKA R4FCK R-21 153900 -9 2566 R4FCK LA5AKA RR73 153915 -8 2566 LA5AKA R4FCK 73 154145 -13 1454 R4FCK RQ6B RR73 154330 -7 1250 UN7FBW R4FCK LO23 (x2) 154545 -9 1830 UC9V R4FCK LO23 (x2)
UTC dB Audio Message 053345 -5 2181 R4FCK UN0GY RR73 134630 -15 1523 R4FCK F4MOA -20 (x8) 135200 -16 2282 R4FCK RD0L -08 135330 -1 2580 R4FCK R6DOB/M -19 140500 -17 1764 R4FCK EX7CQ -22 150615 +4 409 UB0SMX/P R4FCK LO23 150815 -10 1957 LZ3DIV R4FCK LO23 (x2)
UTC dB Audio Message 075915 -21 1571 R4FCK F4CYH -19 (x2) 112615 -22 1422 R4FCK R6DV RR73 142815 -24 1659 R4FCK RT6O -11 144445 -7 2567 R4FCK R2EA -09 145100 -9 2263 R4FCK RK6AH KN94 (x5) 151900 -11 2369 R4FCK R3LCG RR73 105200 +1 793 R4FCK E70SZ JN84 (x2) 144430 -11 735 R4FCK RU4I -11 075545 -16 2325 R4FCK RZ6L 73
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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