K4YJ — 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 K4YJ, decoded by SO8OO in southeastern Poland. 232 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 20 UTC dates in the available aggregate history. Observed between 2026-06-11 and 2026-10-19.
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 232 FT8 messages attributed to K4YJ as the transmitting token by decoded message structure across 20 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (50%), followed by 40 m (35%) and 80 m (15%). Most decodes (87%) fell within the six-hour window 02:00-08:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -16 dB.
Overview
Bands
Last attributed message: 2026-10-19 04:52 UTC
Observed FT8 message patterns
- Attributed sample
- 232 messages
- Active dates
- 20 UTC dates
- Estimated median S/N
- -16 dB
- Estimated 10th-90th percentile
- -23 to -9 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 138, moderate (-15 to -9 dB) 72, strong (≥ -8 dB) 22.
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 K4YJ 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 K4YJ
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
- EM88 · 157 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 7,744 km (approx.)
- Last such locator decoded
- 2026-10-19 04:51 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 | K4YJ S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-22 04:15 | 60m | - / -9 | PA4PA | -3 / - | 3 | ✓ Closing fragment |
| 10-22 04:10 | 60m | - / -16 | TA1BM | -3 / - | 2 | ✓ Closing fragment |
| 10-22 02:07 | 60m | - / -13 | 9K2GR | -3 / - | 2 | ✓ Closing fragment |
| 10-21 22:01 | 40m | - / -6 | W6NWS | -8 / - | 2 | ✓ Closing fragment |
| 10-21 02:46 | 80m | - / -16 | W3DQS | -17 / - | 2 | ✓ Closing fragment |
| 10-19 04:54 | 80m | - / - | DD8BA | +4 / - | 2 | Partial capture |
| 10-19 04:53 | 80m | - / - | HA3HX | +3 / - | 2 | Partial capture |
| 10-19 04:51 | 80m | -23 / -13 | GU4WRP | -8 / - | 4 | ✓ Closing observed |
| 10-19 04:51 | 80m | - / -9 | F4IDN | -3 / - | 6 | ✓ Closing fragment |
| 10-19 04:39 | 60m | - / -15 | IS0AFM | -4 / - | 2 | ✓ Closing fragment |
| 10-17 07:30 | 40m | - / -19 | F4MXT/P | 0 / - | 2 | ✓ Closing fragment |
| 10-17 07:20 | 40m | - / -24 | OE3MZC | -7 / - | 3 | ✓ Closing fragment |
| 10-17 07:01 | 40m | - / -13 | DJ3HW | -2 / - | 2 | ✓ Closing fragment |
| 10-17 07:00 | 40m | - / -11 | F1PBZ | -8 / - | 2 | ✓ Closing fragment |
| 10-17 07:00 | 40m | - / - | F5LSU | -13 / - | 4 | Partial capture |
| 10-17 06:55 | 40m | - / -12 | F4VTR | -16 / - | 2 | ✓ Closing fragment |
| 10-17 06:49 | 40m | - / - | SP3JHY | -16 / - | 2 | Partial capture |
| 10-17 06:47 | 40m | - / -13 | F5LPL | -22 / - | 2 | ✓ Closing fragment |
| 10-17 06:36 | 40m | - / -13 | DD2PI | -3 / - | 3 | ✓ Closing fragment |
| 10-17 06:35 | 40m | - / - | PD0WL | -16 / - | 7 | Partial capture |
| 10-17 06:04 | 40m | - / - | F4NGR | -14 / - | 2 | Partial capture |
| 10-17 05:59 | 40m | - / -15 | GJ0KYZ | -11 / - | 2 | ✓ Closing fragment |
| 10-17 05:56 | 40m | - / -11 | EA6AJW | -7 / - | 2 | ✓ Closing fragment |
| 10-17 05:54 | 40m | - / -15 | HA1BF | +4 / - | 2 | ✓ Closing fragment |
| 10-17 05:49 | 40m | - / -16 | DF1KBN | -5 / - | 3 | Partial capture |
| 10-17 05:48 | 40m | - / -19 | EU4U | +8 / - | 3 | ✓ Closing fragment |
| 10-17 05:34 | 40m | - / -9 | EA7LIC | -10 / - | 2 | ✓ Closing fragment |
| 10-17 05:23 | 40m | - / -16 | IQ3TR | -2 / - | 2 | ✓ Closing fragment |
| 10-17 05:03 | 40m | - / -19 | IK4IDY | -10 / - | 2 | ✓ Closing fragment |
| 10-17 04:32 | 40m | - / -5 | F4EQH | -16 / - | 2 | Partial capture |
| 10-17 04:29 | 40m | - / -23 | LZ2KV | -2 / - | 2 | ✓ Closing fragment |
| 10-17 04:07 | 40m | - / -8 | IU5LQC | -9 / - | 2 | ✓ Closing fragment |
| 10-17 04:02 | 40m | - / - | ON3CX | -16 / - | 2 | ✓ Closing fragment |
| 10-17 03:58 | 40m | - / -11 | ON3CX | -11 / - | 3 | Partial capture |
| 10-17 03:50 | 40m | - / 0 | F4EQH | +14 / - | 2 | Partial capture |
| 10-17 03:13 | 80m | - / -17 | 9A2AJ | +16 / - | 2 | ✓ Closing fragment |
| 10-17 03:10 | 80m | - / -11 | EC5M | 0 / - | 2 | ✓ Closing fragment |
| 10-17 03:08 | 80m | - / -20 | MI0NWA | +10 / - | 2 | ✓ Closing fragment |
| 10-11 05:28 | 80m | - / -13 | IK2TDM | +3 / - | 2 | ✓ Closing fragment |
| 10-11 05:02 | 80m | - / +1 | DJ7M | 0 / - | 2 | ✓ Closing fragment |
| 10-11 04:38 | 80m | -15 / - | EW2ZC | - / - | 2 | Partial capture |
| 10-11 04:37 | 80m | -23 / - | LY5A | - / - | 2 | Partial capture |
| 10-11 04:35 | 80m | - / - | DM5EI | 0 / - | 7 | Partial capture |
| 10-11 04:29 | 80m | - / - | PC2J | 0 / - | 2 | Partial capture |
| 10-11 04:27 | 80m | - / -19 | DL2AXA | +3 / - | 5 | ✓ Closing fragment |
| 10-11 04:17 | 80m | - / - | PC2J | -6 / - | 8 | Partial capture |
| 10-11 04:08 | 80m | - / - | IZ5NRF | +9 / - | 6 | Partial capture |
| 10-11 04:04 | 80m | - / -12 | IK1UGX | +6 / - | 5 | ✓ Closing fragment |
| 10-11 04:03 | 80m | - / -17 | HB9DGK | +5 / - | 5 | ✓ Closing fragment |
| 10-11 03:57 | 80m | - / - | HB9DGK | +3 / - | 4 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 063530 +0 840 K4YJ DH9DR JO31 (x4) 064300 +2 286 K4YJ HB9MFD JN47 (x2) 043930 -4 2587 K4YJ IS0AFM -15 (x2) 020700 -5 1735 K4YJ 9K2GR -13 (x2) 041045 -3 2089 K4YJ TA1BM -16 (x2) 041515 -9 262 K4YJ PA4PA JO22 (x3)
UTC dB Audio Message 070045 -13 1323 K4YJ F5LSU JN19 070045 -6 2438 K4YJ F1PBZ RR73 070145 -14 1323 K4YJ F5LSU JN19 070145 -1 730 K4YJ DJ3HW -13 070215 -15 1322 K4YJ F5LSU JN19 070215 -4 730 K4YJ DJ3HW RR73 071745 -10 1184 K4YJ SQ2PHC JO94 072045 -6 1085 K4YJ OE3MZC -24 (x3) 072415 -16 1025 K4YJ M7FTM -17 073015 -2 360 K4YJ F4MXT/P -19 (x2) 220100 -7 2260 K4YJ W6NWS -06 (x2)
UTC dB Audio Message 045300 -2 545 K4YJ F4IDN R-09 045330 +1 1614 K4YJ HA3HX JN86 045330 -8 546 K4YJ F4IDN R-08 (x2) 045400 +3 2694 K4YJ DD8BA JO42 (x2) 002030 -15 1935 K4YJ VA2AM RR73 010415 -24 1701 K4YJ K2GAV RR73 014245 -22 1903 K4YJ KZ3X -14 014945 -24 1364 K4YJ K0BZ -12 024645 -17 1901 K4YJ W3DQS -16 (x2) 025745 -23 1179 K4YJ AA4VV -06 051615 -8 1071 K4YJ KX4I -09 053230 +24 2397 K4YJ OM3PC JN98
UTC dB Audio Message 151815 -12 508 K4YJ ZS6TIG -20
UTC dB Audio Message 031515 +8 614 K4YJ IW0FFK -18 (x3) 052445 -11 2159 K4YJ IK1LRX JN34 (x2) 052515 -8 419 K4YJ EA3A JN01 052545 -9 2159 K4YJ IK1LRX JN34 052545 -8 419 K4YJ EA3A JN01 (x2) 052615 -15 2114 K4YJ DL3AMW RRR 054845 -12 804 K4YJ G4IRN -14
UTC dB Audio Message 223400 -14 858 K4YJ KD2QEF -13 223915 -9 2703 EA3PV K4YJ EM88 224345 -12 883 N6VMO K4YJ EM88 224530 -15 1385 K4YJ SQ5ANT -18 (x2) 224600 -15 1966 K4YJ KA2D RR73 231815 -16 2058 OY1HJ K4YJ R-13 034130 -12 1587 K4YJ JY5IB -15 (x2) 034300 -7 2262 K4YJ R3MW KO97 (x2) 215700 +1 1952 K4YJ W4DXM -12 (x2) 220645 +1 3015 K4YJ KS0CW -22 (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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