KJ4KFJ — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EN74

Receiver-side FT8 activity involving KJ4KFJ, decoded by SO8OO in southeastern Poland. 226 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 10 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-10-04.

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 226 FT8 messages attributed to KJ4KFJ as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (82%), followed by 40 m (15%) and 80 m (3%). Most decodes (100%) fell within the six-hour window 21:00-03:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -15 dB.

Overview

226

Messages attributed

UTC dates decoded

Active 15-min windows

-15 dB

Estimated median S/N

Bands

80m · 7 40m · 33 20m · 186

First attributed message: 2026-06-08
Last attributed message: 2026-10-04 00:37 UTC

Observed FT8 message patterns

Attributed sample: 226 messages
Active dates: 10 UTC dates
Estimated median S/N: -15 dB
Estimated 10th-90th percentile: -21 to -9 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 98, moderate (-15 to -9 dB) 120, strong (≥ -8 dB) 8.

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 KJ4KFJ in decoded directed-looking exchanges:

EA1KBT · Spain F4ILW · France F5IYE · France HB9SZV · Switzerland IK4LZH · Italy IU1CYA · Italy IU2WCY · Italy IZ6OUX · Italy K5DCW · United States RK9UN · Asiatic Russia SV5BYP · Dodecanese W0OVX · United States

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 KJ4KFJ

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: EN74 · 124 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 7,359 km (approx.)
Last such locator decoded: 2026-10-04 00:37 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	KJ4KFJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-20 01:11	40m	- / -	F5PBG	-11 / -	2	Partial capture
10-19 21:42	40m	- / -	F4BYA	+15 / -	8	Partial capture
10-19 21:34	40m	- / -	F4BYA	+16 / -	4	Partial capture
10-19 21:33	40m	- / -	DL9CE	-20 / -	2	Partial capture
10-19 21:27	40m	- / -	DB3EH	-13 / -	6	Partial capture
10-17 23:59	40m	- / -	G6BCC	-2 / -	2	Partial capture
10-17 23:59	40m	- / -	2E0SHD	-17 / -	6	Partial capture
10-17 15:50	10m	- / -10	CS7BPG	-15 / -	3	Partial capture
10-10 00:01	40m	- / -	G3TKT	-14 / -	2	Partial capture
10-09 23:40	40m	- / -	G3TKT	-10 / -	2	Partial capture
10-09 23:39	40m	- / -	IK2UEC	+1 / -	3	Partial capture
10-09 23:36	40m	- / -	G3TKT	-12 / -	2	Partial capture
10-09 23:31	40m	- / -	EA5W	-11 / -	11	Partial capture
10-09 23:30	40m	- / -	G3TKT	-12 / -	2	Partial capture
10-09 23:21	40m	- / -	2E0BTX	-12 / -	2	Partial capture
10-09 23:20	40m	- / -	F5RAV	-7 / -	3	Partial capture
10-09 23:19	40m	- / -	EA1KCN	-5 / -	3	Partial capture
10-09 23:13	40m	- / -	M0IIO	-5 / -	8	Partial capture
10-09 23:12	40m	- / -	DF8RU	-3 / -	3	Partial capture
10-09 23:10	40m	- / -	IU2THY	-5 / -	2	Partial capture
10-09 23:00	40m	- / -	2E0BTX	-10 / -	2	Partial capture
10-09 22:43	40m	- / -	2E0BTX	-4 / -	5	Partial capture
10-09 22:41	40m	- / -	IK2UEC	-1 / -	3	Partial capture
10-09 22:37	40m	- / -	EA1GCB	-9 / -	2	Partial capture
10-09 22:35	40m	- / -	IK2UEC	-4 / -	2	Partial capture
10-09 22:30	40m	- / -	G1ROK	+1 / -	4	Partial capture
10-09 22:28	40m	- / -	DC8SG	-8 / -	4	Partial capture
10-09 22:26	40m	- / -	G5NGL	-6 / -	2	Partial capture
10-08 00:03	40m	- / -	PC2J	-11 / -	3	Partial capture
10-07 23:35	40m	- / -	PC2J	-11 / -	4	Partial capture
10-07 23:33	40m	- / -	EB2EMZ	-15 / -	2	Partial capture
10-07 23:19	40m	- / -	MW7RHR	-12 / -	3	Partial capture
10-04 00:35	40m	-22 / -	K3EL	- / -	2	Partial capture
10-04 00:30	40m	- / -	F5PBG	-8 / -	2	Partial capture
10-04 00:28	40m	-23 / -	NB4F	- / -	3	Partial capture
10-04 00:25	40m	- / -	F5PBG	-9 / -	2	Partial capture
10-04 00:22	40m	- / -17	NB4F	-21 / -	2	✓ Closing fragment
10-03 00:21	40m	- / -	F5PBG	-7 / -	2	Partial capture
10-03 00:20	40m	- / +2	KX7C	-17 / -	4	✓ Closing fragment
10-02 22:28	40m	- / -	F4BYA	+11 / -	3	Partial capture
10-02 22:23	40m	- / -	G5NGL	+3 / -	2	Partial capture
10-02 22:22	40m	- / -	LA1SDX	-7 / -	3	Partial capture
10-02 22:20	40m	- / -	PD0OTH	-15 / -	3	Partial capture
10-02 22:19	40m	- / -	PA0KGB	-11 / -	6	Partial capture
10-02 22:17	40m	- / -	F4BYA	+9 / -	12	Partial capture
10-02 22:16	40m	- / -	F5PBG	-10 / -	2	Partial capture
10-02 22:11	40m	- / -	F4BYA	+8 / -	4	Partial capture
10-02 22:08	40m	- / -	EA3AAY	-3 / -	4	Partial capture
10-02 22:00	40m	- / -	F4BYA	+15 / -	6	Partial capture
10-02 21:53	40m	- / -	PD1SHE	-18 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

40m

UTC    dB Audio  Message
213345 -19 2060  KJ4KFJ DL9CE JO41
213415 +19 2981  KJ4KFJ F4BYA JN19 (x12)
011130 -11 1353  KJ4KFJ F5PBG IN78 (x2)

10m

UTC    dB Audio  Message
155000 -13 1596  KJ4KFJ CS7BPG IN51 (x3)
165200 -21 2306  KJ4KFJ EA7Z IM67

80m

UTC    dB Audio  Message
003045 +12 2134  KJ4KFJ 9A5E JN75 (x5)
004245  +7 1643  KJ4KFJ UX5UO KO50 (x3)
004615  +7  761  KJ4KFJ F5PBG IN78 (x2)
005515 -21 2450  KJ4KFJ VE1PZ +00 (x2)
010415 -24 2003  KJ4KFJ KF8EXX RR73
011015  -1  761  KJ4KFJ F5PBG IN78
011345 -12 1047  KJ4KFJ W7WZ RR73

20m

UTC    dB Audio  Message
140445  -7  913  KJ4KFJ G8IXM JO02
140445  +0 1711  KJ4KFJ F5NMW JN18
140515  -8  914  KJ4KFJ G8IXM JO02
140515  -1 1711  KJ4KFJ F5NMW JN18 (x2)
140615  -7 1710  KJ4KFJ G1OVA IO93 (x6)
141245 -14 1499  KJ4KFJ M9TMC JO01
141345  -2 1710  KJ4KFJ IK1MJK JN35
141515 -11 1710  KJ4KFJ G1OVA IO93 (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.

Explore CW reception at SO8OO

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