RK4FD — 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 RK4FD, decoded by SO8OO in southeastern Poland. 3,889 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 115 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-22.
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 3,889 FT8 messages attributed to RK4FD as the transmitting token by decoded message structure across 115 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (32%), followed by 40 m (26%) and 160 m (25%). Most decodes (73%) fell within the six-hour window 14:00-20:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (79%); the estimated median was -2 dB.
Overview
Bands
Last attributed message: 2026-10-22 17:07 UTC
Observed FT8 message patterns
- Attributed sample
- 3,889 messages
- Active dates
- 115 UTC dates
- Estimated median S/N
- -2 dB
- Estimated 10th-90th percentile
- -12 to +8.3 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 121, moderate (-15 to -9 dB) 704, strong (≥ -8 dB) 3,064.
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 RK4FD 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 RK4FD
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
- LO22 · 2,331 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,634 km (approx.)
- Last such locator decoded
- 2026-10-22 17:07 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 | RK4FD S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-22 17:05 | 160m | -5 / - | RA3SK | - / - | 5 | Partial capture |
| 10-22 13:23 | 40m | -8 / - | BG5JKZ | - / -18 | 2 | ✓ Closing fragment |
| 10-22 13:18 | 40m | -6 / - | R6UBN | - / - | 7 | ✓ Closing fragment |
| 10-21 18:11 | 160m | -4 / +2 | R4RJ | -19 / -2 | 7 | ✓ Full exchange observed |
| 10-21 17:38 | 160m | - / - | IK5SRB | -3 / - | 5 | Partial capture |
| 10-21 17:36 | 160m | 0 / - | R9OX | - / - | 4 | Partial capture |
| 10-21 17:30 | 160m | -3 / - | R6ZAJ | - / -14 | 5 | ✓ Closing fragment |
| 10-21 17:23 | 160m | -3 / - | R9YEZ | - / - | 3 | Partial capture |
| 10-21 17:19 | 80m | -4 / - | R9YEZ | - / -20 | 3 | ✓ Closing fragment |
| 10-21 17:12 | 80m | -3 / - | R9YEZ | - / - | 2 | Partial capture |
| 10-21 17:05 | 80m | 0 / -4 | R3DQT | 0 / - | 15 | ✓ Full exchange observed |
| 10-21 15:44 | 80m | +2 / - | R9YEZ | - / - | 8 | Partial capture |
| 10-21 14:41 | 40m | +2 / - | HF50HSP | - / -12 | 4 | Partial capture |
| 10-21 14:37 | 40m | -1 / - | R1BRY | -21 / -11 | 4 | ✓ Closing observed |
| 10-21 14:35 | 40m | -1 / -6 | RU3ACA | -3 / - | 4 | Partial capture |
| 10-18 18:27 | 80m | +1 / -2 | EW4DX | -1 / +2 | 7 | ✓ Full exchange observed |
| 10-18 18:25 | 80m | +5 / -4 | R2FEA | +11 / -2 | 5 | ✓ Full exchange observed |
| 10-18 12:17 | 10m | - / - | CS7BDU | -24 / - | 2 | Partial capture |
| 10-18 12:15 | 10m | -12 / - | UB6OAO | - / - | 21 | Partial capture |
| 10-18 03:51 | 160m | -15 / - | R4II | - / - | 2 | ✓ Closing fragment |
| 10-17 20:35 | 160m | -10 / - | UA7K | +4 / +2 | 9 | ✓ Full exchange observed |
| 10-17 17:25 | 160m | -10 / - | R6ZEJ | - / -14 | 2 | ✓ Closing fragment |
| 10-17 17:15 | 160m | -6 / - | R9CS/P | - / +1 | 12 | ✓ Closing fragment |
| 10-17 16:52 | 80m | -6 / - | RO3ZW | - / - | 4 | Partial capture |
| 10-17 16:42 | 80m | -2 / - | R6FMX | - / -11 | 4 | ✓ Closing fragment |
| 10-17 16:17 | 80m | +2 / - | R3TOC | -18 / - | 6 | ✓ Full exchange observed |
| 10-17 16:03 | 80m | +2 / -5 | R3LDQ | -3 / - | 8 | ✓ Full exchange observed |
| 10-16 18:52 | 80m | +1 / - | RX9CN | - / -2 | 2 | ✓ Closing fragment |
| 10-15 17:08 | 80m | -8 / - | R9CS/P | - / +2 | 4 | Partial capture |
| 10-15 16:04 | 80m | -1 / - | R9JDA | - / -24 | 4 | Partial capture |
| 10-15 16:01 | 80m | -3 / -3 | RW3VR | -6 / +7 | 8 | ✓ Full exchange observed |
| 10-15 16:00 | 80m | +2 / - | RX9KJ | - / - | 2 | Partial capture |
| 10-15 15:57 | 80m | 0 / +4 | R6AR | -6 / +3 | 7 | ✓ Full exchange observed |
| 10-15 15:56 | 80m | -2 / - | RU4F | - / +10 | 2 | ✓ Closing fragment |
| 10-15 15:53 | 80m | -4 / - | R0AF | - / -16 | 7 | ✓ Closing fragment |
| 10-15 15:52 | 80m | -6 / - | RZ8U | - / - | 2 | Partial capture |
| 10-15 15:50 | 80m | +1 / +3 | RK6MC | -15 / - | 5 | ✓ Closing observed |
| 10-15 15:45 | 80m | -2 / - | RX9KJ | -21 / -17 | 11 | ✓ Closing observed |
| 10-15 15:42 | 160m | -11 / - | R9CS/P | - / +8 | 4 | ✓ Closing fragment |
| 10-15 15:26 | 40m | -2 / -20 | UB1AUV | -13 / +3 | 5 | ✓ Full exchange observed |
| 10-14 18:24 | 80m | +1 / - | RX3H | - / +4 | 3 | Partial capture |
| 10-14 18:08 | 80m | -3 / - | R3DPI | - / - | 7 | Partial capture |
| 10-14 18:00 | 80m | -3 / - | R3DPI | - / - | 8 | Partial capture |
| 10-14 17:48 | 80m | -1 / - | R3DPI | -14 / +10 | 14 | ✓ Closing observed |
| 10-14 17:38 | 80m | +1 / 0 | R3DPI | -9 / +7 | 3 | Partial capture |
| 10-14 17:26 | 80m | -1 / - | RT3G | - / +1 | 3 | Partial capture |
| 10-13 17:42 | 160m | -4 / - | RA5AD | -12 / - | 5 | ✓ Full exchange observed |
| 10-13 15:20 | 80m | +1 / - | R0XAJ/1 | - / - | 3 | Partial capture |
| 10-13 15:14 | 80m | -2 / - | HF160ID | - / - | 9 | Partial capture |
| 10-12 15:18 | 40m | -5 / -5 | R3MEA | -15 / -19 | 5 | ✓ Full exchange observed |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 173915 +3 1686 RK4FD IK5SRB JN63 (x3) 181100 -5 896 R4RJ RK4FD LO22 181115 -23 1178 RK4FD R4RJ +02 181130 -3 897 R4RJ RK4FD R-02 181145 -17 1178 RK4FD R4RJ RR73 181200 -6 897 R4RJ RK4FD R-02 181215 -17 1179 RK4FD R4RJ RR73 181230 -4 897 R4RJ RK4FD 73 170530 -7 769 RA3SK RK4FD LO22 (x5)
UTC dB Audio Message 143815 -21 1639 RK4FD R1BRY RR73 143830 +0 946 R1BRY RK4FD 73 144130 +4 867 HF50HSP RK4FD LO22 (x4) 131830 -2 952 R6UBN RK4FD LO22 (x7) 132330 -7 952 BG5JKZ RK4FD -18 (x2)
UTC dB Audio Message 170830 -2 833 R3DQT RK4FD LO22 (x5) 171045 -3 1606 RK4FD R3DQT -04 171100 +5 833 R3DQT RK4FD R+12 171115 +4 1606 RK4FD R3DQT RR73 171130 -2 833 R3DQT RK4FD 73 171230 -3 988 R9YEZ RK4FD LO22 (x6)
UTC dB Audio Message 121915 -12 1117 UB6OAO RK4FD LO22 (x15)
UTC dB Audio Message 130845 +5 1105 R1NR RK4FD R-11 (x5) 140045 +1 1105 UB8CSU RK4FD LO22 (x3) 101145 +8 881 R0WBN/P RK4FD LO22 (x7)
UTC dB Audio Message 205145 +6 784 RK4FD S57MPU JN76 (x2)
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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