4X1FK — 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: Israel Most frequent locator attributed to this token: KM71

Receiver-side FT8 activity involving 4X1FK, decoded by SO8OO in southeastern Poland. 382 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 47 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-10-21.

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 382 FT8 messages attributed to 4X1FK as the transmitting token by decoded message structure across 47 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (80%), followed by 80 m (15%) and 40 m (5%). Several six-hour UTC windows tied for the largest share (87%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

382

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

80m · 58 40m · 19 20m · 305

First attributed message: 2026-06-07
Last attributed message: 2026-10-21 03:15 UTC

Observed FT8 message patterns

Attributed sample: 382 messages
Active dates: 47 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -20 to +1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 106, moderate (-15 to -9 dB) 119, strong (≥ -8 dB) 157.

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 4X1FK in decoded directed-looking exchanges:

K2RET · United States SQ1DOZ · Poland W2KOT · United States EA5TT · Spain F5RMK · France F5RRS · France IK1WGX · Italy KT4ZX · United States SV1OML · Greece 9H6C · Malta DO5HOK · Fed. Rep. of Germany EA1EA · Spain

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 4X1FK

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: KM71 · 282 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,325 km (approx.)
Last such locator decoded: 2026-10-21 03:15 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	4X1FK S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-22 02:45	60m	- / -11	F5RMK	-4 / -	2	✓ Closing fragment
10-21 03:11	80m	-14 / -24	SM7TZK	-2 / -	4	Partial capture
10-21 03:07	80m	-15 / -15	F4CTJ	+6 / 0	5	✓ Full exchange observed
10-18 18:31	60m	- / +2	SV1OML	-11 / -	2	✓ Closing fragment
10-18 18:28	60m	- / -15	LZ936BA	-10 / -	2	Partial capture
10-18 18:26	60m	- / -16	EA5TT	-6 / -	3	✓ Closing fragment
10-13 03:31	80m	- / -	LY1DY	-22 / -	2	Partial capture
10-13 03:30	80m	- / -13	F1PBZ	+7 / -	2	Partial capture
10-13 03:29	80m	- / -	UA3ZNQ	-3 / -	3	Partial capture
10-13 03:28	80m	- / -	F5PBG	0 / -	2	Partial capture
10-13 03:27	80m	- / -20	OK1HEH	-16 / -	2	✓ Closing fragment
10-12 04:22	60m	- / -8	IK1WGX	+10 / -	3	✓ Closing fragment
10-12 04:16	60m	- / -16	G0ABI	+13 / -	3	Partial capture
10-12 04:11	60m	- / -10	F5RRS	-2 / -	2	✓ Closing fragment
10-12 03:49	80m	-21 / -	SP1MGM	+1 / -16	3	✓ Closing observed
10-12 03:46	80m	- / -	EA1IOK	0 / -	5	Partial capture
10-12 03:46	80m	- / -16	DL1VVQ	+12 / -	3	Partial capture
10-12 03:46	80m	- / -9	EA1EA	-12 / -	2	✓ Closing fragment
10-12 03:41	80m	- / -	EA1EA	-12 / -	2	Partial capture
10-12 03:39	80m	-12 / -14	T77RN	-6 / -	4	✓ Closing observed
10-12 03:32	80m	-8 / +1	SP5MXZ	-5 / -	13	✓ Full exchange observed
10-12 03:30	80m	-13 / -	9H6C	-14 / -	2	✓ Closing observed
09-06 03:17	40m	- / -	F5PBG	+2 / -	2	Partial capture
09-06 03:16	40m	- / -	EC4DJB	-16 / -	2	Partial capture
09-06 03:14	40m	-12 / -	HP/WE9G	- / -4	3	Partial capture
09-06 03:02	40m	-11 / -	OA4ENG	- / -	15	Partial capture
09-01 03:56	60m	- / -	F6AOJ	+1 / -	3	Partial capture
08-30 06:33	20m	-23 / -	SQ1DOZ	- / -9	2	✓ Closing fragment
08-28 03:41	20m	+2 / -	KC8ZKS	- / -	5	Partial capture
08-27 03:24	20m	-4 / -15	K2RET	-11 / -5	9	✓ Full exchange observed
08-27 03:21	20m	+3 / -	XQ1KK	- / -	3	Partial capture
08-26 03:36	20m	-12 / -	5N0YEN	- / -	3	Partial capture
08-26 03:33	20m	-7 / -	W2KOT	- / -22	4	✓ Closing fragment
08-25 03:02	20m	-18 / -24	VE3LA	-20 / -16	10	Partial capture
08-22 03:58	20m	-2 / -	ZL1PB	- / -	9	Partial capture
08-21 18:57	80m	- / -	YO4FRF	-4 / -	2	Partial capture
08-21 18:51	80m	-15 / -15	DO5HOK	-9 / -	3	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
041730 +15  416  4X1FK G0ABI -16
042230  +7 1332  4X1FK IK1WGX JN44 (x3)
182600  -4  608  4X1FK EA5TT IM99 (x3)
182830  -8 1893  4X1FK LZ936BA -15 (x2)
183115  -9 1437  4X1FK SV1OML +02 (x2)
183430  -9 1893  4X1FK LZ936BA -24
024515  -4 1835  4X1FK F5RMK -11 (x2)
024745  -5 2910  4X1FK KT4ZX 73

40m

UTC    dB Audio  Message
030715  -8 2487  OA4ENG 4X1FK KM71 (x7)
031415 -10 2708  HP/WE9G 4X1FK KM71 (x3)
031630 -18 2072  4X1FK EC4DJB IN80
031700  +2 2758  4X1FK F5PBG IN78
031700 -15 2072  4X1FK EC4DJB IN80
031730  +2 2758  4X1FK F5PBG IN78
031545 -21 1440  K7D 4X1FK KM71

80m

UTC    dB Audio  Message
033015  -8  946  4X1FK UA3ZNQ KO81
033030  +9  453  4X1FK F1PBZ -13
033115 -23 1744  4X1FK LY1DY KO14 (x2)
174430  +3 1463  4X1FK YO3CIY -09
040200 -23 1804  ON8LX 4X1FK KM71
030745 -16 1041  F4CTJ 4X1FK KM71 (x2)
030830  +6 1039  4X1FK F4CTJ -15
030845 -15 1041  F4CTJ 4X1FK R+00
030900  +6 1039  4X1FK F4CTJ RR73
031115 -14  968  SM7TZK 4X1FK KM71
031130  -4  968  4X1FK SM7TZK -24 (x3)

20m

UTC    dB Audio  Message
032600  -3 1517  K2RET 4X1FK KM71 (x3)
032715 -11 1516  4X1FK K2RET -15
032730  -4 1516  K2RET 4X1FK R-05 (x2)
034130  +2  669  KC8ZKS 4X1FK KM71 (x5)
062215  -2 2172  O21 4X1FK KM7
062230 -21  850  4X1FK IU5RPJ -15
063330 -24 1744  SQ1DOZ 4X1FK R-09 (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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