4X1SK — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Israel Most frequent locator attributed to this token: KM72

Receiver-side FT8 activity involving 4X1SK, decoded by SO8OO in southeastern Poland. 140 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-21 and 2026-08-28.

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 140 FT8 messages attributed to 4X1SK as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (55%), followed by 40 m (37%) and 80 m (8%). Most decodes (60%) fell within the six-hour window 22:00-04:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

140

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

80m · 11 40m · 52 20m · 77

First attributed message: 2026-06-21
Last attributed message: 2026-08-28 15:46 UTC

Observed FT8 message patterns

Attributed sample: 140 messages
Active dates: 13 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -19 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 41, moderate (-15 to -9 dB) 49, strong (≥ -8 dB) 50.

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 4X1SK in decoded directed-looking exchanges:

TN8GD · Republic of the Congo W7C · United States 3D2USU · Fiji BG0HP · China BI4IWL · China F5RRS · France NQ3N · United States R7DX · European Russia T22TT · Tuvalu VP2MAA · Montserrat YD8NEH · Indonesia ZL1GT · New Zealand

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 4X1SK

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: KM72 · 81 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,224 km (approx.)
Last such locator decoded: 2026-08-28 15:37 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	4X1SK S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-28 15:45	40m	-12 / -6	R7DX	+1 / -	4	✓ Full exchange observed
08-28 15:38	40m	-14 / -24	F5RRS	-5 / -10	5	✓ Full exchange observed
08-28 15:37	40m	-13 / -	BI4IWL	- / -14	3	✓ Closing fragment
08-28 15:35	40m	-15 / -	YD8NEH	- / -1	3	✓ Closing fragment
08-28 15:32	40m	-15 / -	BG0HP	- / -1	4	✓ Closing fragment
07-18 18:04	40m	- / -2	UA4FEN	-19 / -	2	Partial capture
07-18 18:03	40m	-16 / -	T22TT	- / -23	3	✓ Closing fragment
07-18 18:01	40m	- / -24	UA3ZQN	-3 / -	4	Partial capture
07-14 20:22	20m	-10 / -	VK9DX	- / -	15	Partial capture
07-13 22:42	80m	- / -	G4ZFJ	+6 / -	4	Partial capture
07-13 22:42	80m	- / -	UA4FKT	+4 / -	2	Partial capture
07-13 22:40	80m	-7 / -13	TJ1GD/P	-17 / -7	5	✓ Full exchange observed
07-13 03:27	40m	- / -	F5RRS	-23 / -	2	Partial capture
07-13 03:23	40m	- / -	DL9KM	-14 / -	2	Partial capture
07-09 02:28	20m	-13 / -	W7C	- / -19	10	✓ Closing fragment
07-09 02:20	40m	-16 / -	TJ1GD/P	- / -3	2	Partial capture
07-09 02:11	40m	-16 / -	TJ1GD/P	- / -	4	Partial capture
07-09 02:06	80m	- / -	UA4FKT	-2 / -	2	Partial capture
07-09 02:03	80m	+6 / -4	EA1IOK	-3 / +3	3	✓ Full exchange observed
07-09 02:03	80m	+6 / -11	DO9BAU	+2 / 0	8	✓ Full exchange observed
07-09 02:01	80m	+10 / -	<...>	- / -11	2	Partial capture
06-27 02:40	40m	-8 / -	VP2MAA	- / +3	6	✓ Closing fragment
06-26 19:31	20m	-2 / -	EP2AES	- / -	2	Partial capture
06-26 19:20	20m	-4 / -	EP2AES	- / -13	6	Partial capture
06-24 16:31	20m	- / -	DL9KM	-1 / -	5	Partial capture
06-24 16:29	20m	-11 / -	TN8GD	- / -	3	✓ Closing fragment
06-23 18:02	20m	- / -	M9WHQ	-7 / -	2	Partial capture
06-23 18:01	20m	-10 / -	VR2VAZ	- / -	3	Partial capture
06-23 17:59	20m	-12 / -	JY5IB	- / -3	2	Partial capture
06-23 14:07	20m	-19 / -	TN8GD	- / -	2	Partial capture
06-23 14:02	20m	-22 / -	TN8GD	- / -	2	Partial capture
06-23 02:51	40m	-14 / -	PZ5TW	- / -	4	Partial capture
06-22 18:21	40m	-16 / -	3D2USU	- / +2	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
153600 -16 1737  YD8NEH 4X1SK 73
153700 -14 1737  BI4IWL 4X1SK KM72 (x3)
153815  -9 1980  4X1SK F5RRS JN36 (x2)
153900 -15 1737  F5RRS 4X1SK -10
153915  -5 1980  4X1SK F5RRS R-24
153930 -12 1737  F5RRS 4X1SK RR73
154100 -15 1737  ZL1GT 4X1SK 73
154430 -16 1733  4X1SK RA6UU LN46
154530  +0 1933  4X1SK R7DX -06
154545 -11 2006  R7DX 4X1SK R+11
154600  +2 1933  4X1SK R7DX RR73
154615 -12 2006  R7DX 4X1SK 73

20m

UTC    dB Audio  Message
202230  -8 2211  VK9DX 4X1SK KM72 (x15)

80m

UTC    dB Audio  Message
020600 -10 2005  4X1SK R6DZL LN04
020600  -2 1803  4X1SK LB2YJ -16
020600  +6 2102  4X1SK DO9BAU 73
020630  +0 2714  4X1SK UA4FKT LO23
224045  -7 2123  TJ1GD/P 4X1SK KM72
224100 -15 1121  4X1SK TJ1GD/P -13
224115  -8 2123  TJ1GD/P 4X1SK R-07
224130 -19 1122  4X1SK TJ1GD/P RR73
224145  -5 2123  TJ1GD/P 4X1SK 73
224200  +7 2123  4X1SK UA4FKT LO23 (x2)
224230  +2  597  4X1SK G4ZFJ JO01 (x4)

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.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee