RK4CH — 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 RK4CH, decoded by SO8OO in southeastern Poland. 2,248 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 79 UTC dates in the available aggregate history. Observed between 2026-06-25 and 2026-11-06.
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 2,248 FT8 messages attributed to RK4CH as the transmitting token by decoded message structure across 79 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (46%), followed by 40 m (33%) and 20 m (20%). Most decodes (64%) fell within the six-hour window 23:00-05:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8 dB.
Overview
Bands
Last attributed message: 2026-11-06 03:26 UTC
Observed FT8 message patterns
- Attributed sample
- 2,248 messages
- Active dates
- 79 UTC dates
- Estimated median S/N
- -8 dB
- Estimated 10th-90th percentile
- -18 to +1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 367, moderate (-15 to -9 dB) 712, strong (≥ -8 dB) 1,169.
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 RK4CH 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 RK4CH
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
- LO32 · 1,327 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,769 km (approx.)
- Last such locator decoded
- 2026-11-06 03:26 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 | RK4CH S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 11-06 03:26 | 80m | -12 / - | SP8WB | - / - | 2 | Partial capture |
| 11-06 03:24 | 80m | -14 / +2 | TA1MB | -17 / -14 | 3 | ✓ Full exchange observed |
| 11-06 03:22 | 80m | -8 / - | RA6OQ | - / 0 | 4 | ✓ Closing fragment |
| 11-06 03:21 | 80m | -6 / - | RL6ZK | -18 / +7 | 3 | ✓ Full exchange observed |
| 11-05 03:57 | 80m | - / +4 | SV8TOZ | -16 / - | 2 | ✓ Closing fragment |
| 11-05 03:54 | 80m | -11 / -18 | IU8SDA | +5 / -7 | 4 | ✓ Full exchange observed |
| 11-05 03:37 | 80m | -7 / +3 | LZ1NI | -19 / - | 2 | Partial capture |
| 11-05 03:05 | 80m | -12 / - | RU6LC | - / +6 | 3 | ✓ Closing fragment |
| 11-04 06:08 | 40m | - / - | LZ1ZF | -6 / - | 2 | Partial capture |
| 11-04 06:05 | 40m | -11 / -11 | OK2CNI | +3 / -19 | 3 | ✓ Full exchange observed |
| 11-04 05:54 | 40m | - / -14 | DB1TH | +10 / - | 2 | ✓ Closing fragment |
| 11-04 05:52 | 40m | -13 / -12 | HB9ELE | +8 / -15 | 3 | ✓ Full exchange observed |
| 11-04 05:47 | 40m | -10 / - | R4ADE | - / +1 | 3 | ✓ Closing fragment |
| 11-04 02:45 | 80m | -22 / +4 | RA6FCU/P | +1 / -4 | 3 | Partial capture |
| 11-04 02:40 | 80m | -15 / -1 | CT7BRV | -6 / - | 5 | ✓ Closing observed |
| 11-02 04:06 | 40m | -17 / - | CT7BRV | -20 / -12 | 4 | ✓ Closing observed |
| 11-02 04:04 | 40m | -9 / - | M9DNC | - / -1 | 2 | Partial capture |
| 11-02 02:51 | 80m | -7 / - | RU4CK/P | - / -14 | 3 | ✓ Closing fragment |
| 10-31 03:46 | 80m | -5 / - | UD3T | -6 / +8 | 4 | ✓ Closing observed |
| 10-31 03:02 | 80m | -7 / -8 | HB9EOT | -4 / -15 | 8 | ✓ Full exchange observed |
| 10-31 02:59 | 80m | - / - | DF8RU | 0 / - | 2 | Partial capture |
| 10-31 02:56 | 80m | -8 / - | RJ3DC | - / +4 | 2 | Partial capture |
| 10-31 02:55 | 80m | 0 / - | R4FDD | -4 / - | 3 | ✓ Closing observed |
| 10-31 02:50 | 80m | - / - | RL3QGD | -14 / - | 3 | ✓ Closing fragment |
| 10-31 02:47 | 80m | -9 / +1 | SQ9PCH | -1 / +2 | 5 | ✓ Full exchange observed |
| 10-29 04:27 | 40m | -8 / -11 | UA6LTA | -13 / 0 | 6 | ✓ Full exchange observed |
| 10-29 03:55 | 80m | -17 / - | RU6LC | - / - | 10 | Partial capture |
| 10-29 03:53 | 80m | -6 / -6 | SP1IWC | +8 / -12 | 4 | ✓ Full exchange observed |
| 10-29 03:42 | 80m | - / 0 | OM2WQ | +9 / - | 2 | Partial capture |
| 10-29 03:38 | 80m | -13 / -7 | ON5ZZ | -8 / -15 | 5 | ✓ Full exchange observed |
| 10-25 02:55 | 80m | -4 / - | SP5GRM | - / - | 2 | Partial capture |
| 10-25 02:54 | 80m | +7 / - | RA6LTD | - / 0 | 2 | ✓ Closing fragment |
| 10-25 02:44 | 80m | +1 / -10 | R6AAG | -12 / -8 | 4 | ✓ Full exchange observed |
| 10-25 02:07 | 80m | -2 / +4 | S51SLO | +8 / -9 | 4 | ✓ Full exchange observed |
| 10-23 04:01 | 40m | -11 / -7 | ON6WDL | -4 / -16 | 5 | ✓ Full exchange observed |
| 10-23 02:55 | 40m | -22 / - | R3KLE | - / -2 | 2 | ✓ Closing fragment |
| 10-23 02:50 | 80m | - / -5 | ON1JP | -16 / - | 3 | Partial capture |
| 10-23 02:49 | 80m | -4 / - | RA6Z | -3 / +4 | 4 | ✓ Full exchange observed |
| 10-23 02:49 | 80m | -5 / - | UA9FMT | -3 / -2 | 2 | Partial capture |
| 10-22 13:24 | 40m | -20 / - | BD3PPH | - / - | 2 | Partial capture |
| 10-22 13:20 | 40m | -10 / - | RD6OX | +4 / - | 3 | ✓ Closing observed |
| 10-21 14:05 | 40m | -17 / - | RZ9AO | - / -14 | 3 | Partial capture |
| 10-21 14:01 | 40m | -16 / - | YB5WIR | - / -19 | 2 | ✓ Closing fragment |
| 10-21 13:56 | 40m | -8 / - | HL5BMX | - / -13 | 3 | ✓ Closing fragment |
| 10-21 13:48 | 40m | -10 / - | DL1HTW | - / - | 15 | Partial capture |
| 10-21 13:44 | 40m | -7 / - | RT8T | - / +4 | 3 | ✓ Closing fragment |
| 10-21 11:24 | 10m | - / -15 | 7Z1BQ | -14 / - | 2 | ✓ Closing fragment |
| 10-21 04:59 | 40m | -21 / - | R1TET | - / +2 | 2 | ✓ Closing fragment |
| 10-19 14:00 | 40m | -13 / - | EW6MP | - / -8 | 3 | ✓ Closing fragment |
| 10-19 13:56 | 40m | -18 / - | JT1DN | - / - | 3 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 035515 -8 1573 IU8SDA RK4CH 73 035730 -15 1400 RK4CH SV8TOZ +04 (x2) 032115 -14 1669 RK4CH RL6ZK +23 032130 -6 1669 RL6ZK RK4CH R+07 032145 -23 1669 RK4CH RL6ZK RR73 032230 -4 1942 RA6OQ RK4CH LO32 (x4) 032445 -17 1503 RK4CH TA1MB +02 032500 -12 1503 TA1MB RK4CH R-14 (x2) 032600 -12 861 SP8WB RK4CH LO32 (x2)
UTC dB Audio Message 054730 -10 2734 R4ADE RK4CH LO32 (x3) 055230 +10 642 RK4CH HB9ELE -12 055245 -13 642 HB9ELE RK4CH R-15 055300 +6 642 RK4CH HB9ELE RR73 055400 +15 2938 RK4CH DB1TH -14 (x2) 060345 +5 1601 RK4CH OT7K RR73 060515 +4 2447 RK4CH OK2CNI -11 060530 -11 2447 OK2CNI RK4CH R-19 060545 +2 2447 RK4CH OK2CNI RR73 060815 -5 1763 RK4CH LZ1ZF KN22 (x2) 044000 -15 1722 R4HNX/P RK4CH R-12
UTC dB Audio Message 063345 -13 1612 RK4CH RA3QPY +09 (x2) 062545 -17 1757 RK4CH RX6LG -08 112415 -17 1124 RK4CH 7Z1BQ -15 (x2)
UTC dB Audio Message 041000 -4 2064 RK0SWA RK4CH LO32 (x3) 062215 +2 1509 IV3APC RK4CH LO32 113900 -9 1493 LA8OOA RK4CH LO32 (x3) 114615 -8 1408 OE3MZC RK4CH LO32 (x3) 123200 +5 857 TA7D RK4CH LO32 (x5)
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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