KF4YUS — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: FM06

Receiver-side FT8 activity involving KF4YUS, decoded by SO8OO in southeastern Poland. 2 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-08-26.

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 FT8 messages attributed to KF4YUS as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The available sample contains attributed decodes on 20 m (100%). The sample is too small to infer a recurring UTC-hour or received-S/N pattern.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

S/N pattern not inferred

Bands

20m · 2

First attributed message: 2026-08-26
Last attributed message: 2026-08-26 04:15 UTC

Observed FT8 message patterns

Attributed sample: 2 messages
Active dates: 1 UTC dates
S/N summary: Too few decodes
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with KF4YUS in decoded directed-looking exchanges:

EA3CJU · Spain ×2 A93MO · Bahrain IT9CCB · Sicily UR3LM · Ukraine ZL1BQD · New Zealand 4X5MZ · Israel A71XX · Qatar EA1EQ · Spain F1PBZ · France MI0TMW · Northern Ireland SV9QWC · Crete US0QV · Ukraine

Most frequent locator attributed to KF4YUS

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: FM06 · 2 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 7,672 km (approx.)
Last such locator decoded: 2026-08-26 04:15 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	KF4YUS S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 23:31	40m	- / -18	SV9QWC	-8 / -	3	✓ Closing fragment
09-15 23:15	40m	- / -	M0PEL	-4 / -	12	Partial capture
08-26 04:15	20m	-20 / -	UA3ZAB	- / -	2	Partial capture
08-26 04:13	20m	- / -	EA4ITG	-14 / -	2	Partial capture
08-26 04:10	20m	- / -23	R3KCW	+8 / -	3	Partial capture
08-24 05:08	20m	- / -13	IT9CCB	+4 / -	3	✓ Closing fragment
08-24 04:45	20m	- / -14	UR3LM	-19 / -	3	✓ Closing fragment
08-24 04:44	20m	- / -13	A93MO	-14 / -	3	✓ Closing fragment
07-29 03:28	20m	- / -20	EA3CJU	-6 / -	4	✓ Closing fragment
07-29 03:24	20m	- / -18	EA3CJU	-8 / -	2	✓ Closing fragment
07-29 03:21	20m	- / -	EA3CJU	-10 / -	2	Partial capture
07-28 00:42	40m	- / -14	9A60CBM	-9 / -	3	Partial capture
07-17 02:25	40m	- / -15	4X5MZ	-12 / -	2	✓ Closing fragment
07-17 01:29	40m	- / -	US0QV	-14 / -	2	✓ Closing fragment
07-17 01:08	40m	- / -19	EA1EQ	-16 / -	4	✓ Closing fragment
07-17 00:36	40m	- / -13	A71XX	-10 / -	2	✓ Closing fragment
07-11 23:59	20m	- / -10	9K2YM	-7 / -	2	Partial capture
06-26 22:28	20m	- / -12	EA1EQ	-18 / -	2	Partial capture
06-24 04:10	80m	- / -15	PI4DX	-3 / -	4	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
231545  -6  610  KF4YUS M0PEL JO01 (x2)
231615 -14 1031  KF4YUS KC9QLM FN31
231645  -2  610  KF4YUS M0PEL JO01 (x9)
233100 -11 1980  KF4YUS SV9QWC R-18 (x3)

20m

UTC    dB Audio  Message
044615 -23 1526  KF4YUS UR3LM R-14 (x2)
045630 -22 1305  KF4YUS ZL1BQD RR73
050830  +1 1528  KF4YUS IT9CCB JM77 (x3)
053045 -18 1400  KF4YUS E77FN JN93
040130 -11 1458  KF4YUS R3KCW KO90 (x4)
041300 -17 2248  KF4YUS EA4ITG IN80 (x2)
041515 -24 1525  UA3ZAB KF4YUS FM06 (x2)

80m

UTC    dB Audio  Message
041030  +3 1116  KF4YUS PI4DX JO21 (x4)
005030 -19  529  KF4YUS VE9GC RR73

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